Kacey Shaffer: Let’s Go Fishing! August 1, 2014

NOAA Teacher at Sea

Kacey Shaffer

Aboard NOAA Ship Oscar Dyson

July 26 – August 13, 2014

Mission: Walleye Pollock Survey

Geographical Location: Bering Sea

Date: August 1, 2014

Weather information from the Bridge:

Air Temperature: 9.7° C

Wind Speed: 11.9 knots

Wind Direction: 153°

Weather Conditions: Foggy

Latitude: 58°19’42 N

Longitude: 175°14’66 W

 

Science and Technology Log:            

If you’ve ever been fishing, be it on a lake, river or stream, you know it is not productive to fish all day in a spot where they aren’t biting. If the fish aren’t biting in one spot, you would most likely pack up and move to a different spot. Now imagine trying to fish in an area that is 885,000 square miles. The equivalent to trying to find a needle in a haystack! Luckily, the Oscar Dyson has sophisticated equipment to help us determine where the fish are hanging out. Allow me to introduce you to a very important location on the ship – The Acoustics Lab.

When you enter The Acoustics Lab, you’ll immediately see a wall of nine computer screens. The data shown on the screens help Chief Scientist Taina and Fishery Biologist Darin make the key decision of where we will deploy the nets and fish. What information is shown on the screens? Some show our location on the transect lines we are following, which is similar to a road map we would use to get from point A to point B on land. The transect lines are predetermined “roads” we are following. Another screen tells us which direction the boat is heading, barometric pressure, air temperature, surface temperature, and wind direction and wind speed. The most technical screens show the data collected from transducers attached to the bottom of the ship on what is referred to as the Center Board. There are five transducers broadcasting varying frequencies. Frequency is the number of sound waves emitted from a transducer each second. The Dyson transducers emit sound waves at 18kHz, 38kHz, 70kHz, 120kHz and 200kHz (kHz= kilohertz). Why would it be necessary to have five transducers? Certain organisms can be detected better with some frequencies compared to others.  For example, tiny organisms like krill can be seen better with higher frequencies like the 120kHz compared to the lower frequencies. Also the lower frequencies penetrate farther into the water than the higher frequencies so they can be used in deeper water. Having this much data enables the scientists to make sound decisions when choosing where to fish.

A map of the Bering Sea showing transect lines in white. During this pollock survey the Oscar Dyson follows transect lines which benefits both the crew and scientists.

A map of the Bering Sea showing transect lines in white. During this pollock survey the Oscar Dyson follows transect lines which benefits both the crew and scientists.

Transducers produce these images displayed on the screens in the Acoustics Lab. The thick red line at the bottom is the sea floor and the  many red, oblong shaped areas indicate large clusters of fish. Let’s go fishing!

Transducers produce these images displayed on the screens in the Acoustics Lab. The thick red line at the bottom is the sea floor and the many red, oblong shaped areas indicate large clusters of fish. Let’s go fishing!

Personal Log:

Each time I share a blog post with you I am going to focus on one area of the ship so you can get acquainted with my new friend, Oscar Dyson. I’ll begin sharing about my stateroom and the lounge. I was very surprised by the size of my room when I arrived last Thursday. My roommate is Alyssa, a Survey Tech. You will learn more about her journey to the Dyson later. She has been on the ship for a while so she was already settled in to the top bunk which put me on the bottom bunk! The beds are very comfortable and the rocking motion of the ship is really relaxing. I’ve had no trouble sleeping, but then again, when have I ever had trouble sleeping?! We have our own private bathroom facilities, which is a definite bonus. Take a look at our room.

The stateroom Kacey shares with Alyssa.

The stateroom Kacey shares with Alyssa.

Our stateroom's private bath. Could that shower curtain be any more fitting?!

Our stateroom’s private bath. Could that shower curtain be any more fitting?!

Alyssa and I are on opposite shifts. She works midnight to noon and I work 4:00pm to 4:00am. There is a little bit of overlap time where she’s off and I haven’t gone to work yet. This is quite common for all of the people on the ship. This is a twenty-four hours a day, seven days a week operation. Someone is always sleeping and someone is always working. Fortunately there is a place where we can hang out without bothering our roommates. The Lounge is a great place to kick back and relax. There are comfy chairs and a very large couch and a television with the ability to play dvd’s or video games. Over the years people have brought books with them and then left them on the ship so we have an enormous library. Sometimes there are people just reading in the Lounge and other times a group of us will watch a movie together. There is one important rule of showing movies…if you start a movie you have to let it play all the way out. Even if you get bored with it or need to leave you must let it play because someone may be watching it in their room. It would be rude of us to continually shut movies off an hour into them!

Career Connections: ST Alyssa Pourmonir

ST Pourmonir checks data on the computer during a CTD deployment.

ST Pourmonir checks data on the computer during a CTD deployment.

Alyssa hails from Pennsylvania. During her senior year of high school she chose to further her education at the Coast Guard Academy. She spent three years studying with the Coast Guard, but ultimately graduated from SUNY Maritime this past January. Alyssa landed a 10 week internship with a NASA facility in Mississippi. During the course of her internship she learned of an opportunity with NOAA. This position would be a Survey Tech, traveling on one of NOAA’s many ships. She arrived at the Dyson only a few weeks before I did.

Alyssa has many responsibilities as a Survey Tech. She assists with the deploying and recovery of the CTD instrument, helps process fish in the wet lab, completes water tests, and serves as a liaison between the ship’s crew and its scientists. When a trawling net is deployed or recovered, Alyssa is on the deck to attach or detach sensors onto the net. She also looks for safety hazards during that time.

When asked what the best part of her job is she quickly responds learning so much science is the best! As a Survey Tech, she gets the chance to see how all the different departments on the ship come together for one mission. She works closely with the scientists and is able to learn about fish and other ocean life. On the other hand, she also works side-by-side with the ship’s crew. This allows her to learn more about the ship’s equipment. Being the positive person she is, Alyssa turned the hardest part of her job into a benefit for her future self. Adjusting to 12 hour shifts has been a challenge but she noted this can also be helpful. When she is super busy she is learning the most and it also makes the time go faster.

Looking ahead to her future, Alyssa sees herself getting a Master’s Degree in a science related field. Some areas of interest are oceanography, remote sensing or even meteorology. Alyssa’s advice for all high school students: STUDY SCIENCE!

Did you know?

Lewis Richardson, an English meteorologist, patented an underwater echo ranging device two months after the Titanic sunk in 1912.

Johanna Mendillo: Hello pollock…. can you hear me now? August 7, 2012

NOAA Teacher at Sea
Johanna Mendillo
Aboard NOAA ship Oscar Dyson
 July 23 – August 10

Mission: Pollock research cruise
Geographical area of the cruise: Bering Sea
Date: Tuesday, August 7, 2012

Location Data from the Bridge:
Latitude: 59 52 ’ N
Longitude: 177 17’ W
Ship speed:   8.0 knots ( 9.2 mph)

Weather Data from the Bridge:
Air temperature: 7.3C (45.1ºF)
Surface water temperature: 8.4C (47.1ºF)
Wind speed:  4 knots ( 4.6 mph)
Wind direction: 75T
Barometric pressure:  1018 millibar (1 atm)

Science and Technology Log:

We are wrapping up our final few sampling transects.  Now that you are practically fisheries biologists yourselves from reading this blog, students, we must return to the fundamental question— how do we FIND the pollock out here in the vast Bering Sea?  The answer, in one word, is through ACOUSTICS!

Look at all of these birds off the stern!  Why do you think they are following us?  Are we about to haul up a catch, perhaps?

Look at all of these birds off the stern! Why do you think they are following us? Are we about to haul up a catch, perhaps?

Hydroacoustics is the study of and application of sound in water.  Scientists on the Oscar Dyson use hydroacoustics to detect, assess, and monitor pollock populations in the Bering Sea.

Now, you may have heard of SONAR before and wonder how it connects to the field of hydroacoustics.  Well, SONAR (SOund Navigation and Ranging) is an acoustic technique in which scientists send out sound waves and measure the “echo characteristics” of targets in the water when the sound waves bounce back— in this case, the targets are, of course, the pollock!  It was originally developed in WWI to help locate enemy submarines!  It has been used for scientific research for over 60 years.

(PLEASE NOTE: The words sonar, fishfinders, and echosounders can all be used interchangeably.)

The transducer sends out a signal and waits for the return echo...

The transducer sends out a signal and waits for the return echo once it bounces off the fish’s swim bladder… (Source: http://www.dosits.org)

On the Dyson, there is, not one, but a collection of five transducers on our echosounder, and they are set at five different frequencies.  It is lowered beneath the ship’s hull on a retractable centerboard.  The transducers are the actual part of the echosounder that act like antennae, both transmitting and receiving return signals.

The transducers transmit (send out) a “pulse” down through the water, at five different speeds ranging from 18-200kHz, which equals 18,000-200,000 sound waves a second!

When the pulse strikes the swim bladders inside the pollock, it gets reflected (bounced back) to the transducer and translated into an image.

First of all, what is a swim bladder?  It is simply an organ in fish that helps them stay buoyant, and, in some cases, is important for their hearing.

Swim Bladder (Source: www.education.com)

Swim Bladder (Source: http://www.education.com)

Now, why do the pulses bounce off the swim bladders, you ask?  Well, they are filled mostly with air and thus act as a great medium for the sound waves to register and bounce back.

Think of it this way: water and air are two very different types of materials, and they have very different densities.  The speed of sound always depends on the material through which the sound waves are traveling through.  Because water and air have very different densities, there is a significant difference in the speed of sound through each material, and that difference in speed is what is easy for the sonar to pick up as a signal!

It is the same idea when sound waves are used to hit the bottom of the ocean to measure its depth- it is easy to read that signal because the change in material, from water to solid ground, produces a large change in the speed of the sound waves!

Here is a sonar system measuring the depth of the ocean...

Here is a sonar system measuring the depth of the ocean… (Source: http://www.dosits.org)

Interestingly, different types of fish have different shaped and sized swim bladders, and scientists have learned that they give off different return echos from sonar signals!  These show up as slightly different shapes on the computer screen, and are called a fish’s “echo signature”.  We know, however, that we will not encounter many fish other than pollock in this area of the Bering Sea, so we do not spend significant time studying the echo signatures on this cruise.

So, what happens when these signals return to the Dyson?  They are then processed and transmitted onto the computer screens in the hydroacoutsics lab on board.  This place is affectionately known as “the cave” because it has no windows, and it is, in fact, the place where I spend the majority of my time when I am not processing fish!  Here it is:

Here is Anatoli observing potential fish for us to go catch!

Here is Anatoli observing potential fish for us to go catch!

We spend a lot of time monitoring those computer screens, and when we see lots of “specks” on the screen, we know we have encountered large numbers of pollock!

Here we are approaching a LARGE group of pollock!

Here we are approaching a LARGE group of pollock!

When the scientists have discussed and confirmed the presence of pollock, they then call up to the Bridge and announce we are “ready to go fishing” at a certain location and a certain depth range!  Then, the scientists will head upstairs to the Bridge to work with the officers and deck crew to supervise the release, trawling, and retrieval of the net.

Now, in addition to the SONAR under the ship, there are sensors attached to the top of the net itself, transmitting back data.  All of the return echos get transmitted to different screens on the bridge, so not only can you watch the fish in the water before they are caught, you can also “see” them on a different screen when they are in the net!  As I told you in the last post, we will trawl for anywhere from 5-60 minutes, depending on how many fish are in the area!

Left: Echosounder at work/  Right: The "return signature" is visible on the computer!

Left: Echosounder at work/ Right: The “return signature” is visible on the computer!  (Source: http://www.dosits.org)

A full catch- success!  Without acoustics, it would be much harder for NOAA to monitor and study fish populations.

A full catch- success! Without acoustics, it would be much harder for NOAA to monitor and study fish populations.

Personal Log:

In these last few days, we have crossed back and forth from the Russian Exclusive Economic Zone (EEZ) and the U.S. several times.  There were some nice views of Eastern Russia before the clouds and fog rolled in!

I can see Russia from my ship!

I can see Russia from my ship! (Photo Credit: Allan Phipps)

In addition, we crossed over the International Date Line!  It turns out that everyone on board gets a special certificate called the “Domain of the Golden Dragon” to mark this event.  This is just one of a set of unofficial certificates that began with the U.S. Navy!  If you spend enough time at sea, you can amass quite a collection- there are also certificates for crossing the Equator, Antarctic Circle, Arctic Circle, transiting the Panama Canal, going around the world, and more…

I will award a prize to the first person who writes back to tell me what does it mean when one goes from a “pollywog” to a “shellback”, in Navy-speak!

Here is a picture of me with the largest pollock I have seen so far- 70cm!

If I am 5' 4", how many 70cm pollock would it take to equal my height?

If I am 5′ 4″, how many 70cm pollock would it take to equal my height?

Lastly, on to some, perhaps, cuter and more cuddly creatures than pollock- pets!  Here in the hydroacoustics lab, there is a wall dedicated to pictures of pets owned by the officers, crew, and scientists:

Those are some pretty cute pets left ashore...

Those are some pretty cute pets left ashore…

Clearly, this is a dog crowd!   I did learn, however, that our Chief Scientist, Taina, has her cat (Luna) up there!  Students, do you remember the name of my cat and, what do you think, should I leave a picture of her up here at sea?

Kaci Heins: Surveying and Processing, September 30 – October 3, 2011

NOAA Teacher at Sea
Kaci Heins
Aboard NOAA Ship Rainier
September 17 — October 7, 2011

Mrs. Heins Taking a CTD Cast


Mission: Hydrographic Survey
Geographical Area: Alaskan Coastline, the Inside Passage
Date: Tuesday, October 4, 2011


Weather Data from the Bridge

Clouds: Overcast 7/8
Visibility: 8 Nautical Miles
Wind: 21 knots
Temperature
Dry Bulb: 12.0 degrees Celsius
Barometer: 997.0 millibars
Latitude: 55.23 degrees North
Longitude: -133.22 degrees West

Science and Technology Log

Watching The Sonar

I was able to go out on another launch boat Sunday to collect survey data.  It was a beautiful day with amazing scenery to make it by far the best office I have ever been too.  Despite the fact that the ship is usually “off the grid” in many ways, the location of their work environment, or office, in Alaska is visually stunning no matter where you turn.  Keeping your eyes off the cedar trees and focused on the sonar in a launch can be challenging at times!  However, when there is a specific job to be done that involves time and money, then the scenery can wait until the job is finished.  During Sunday’s launch survey we had to clean up some “Holidays” and acquire some cross line data.

View Of the Data Acquired For the Ship On The Bridge

The word “Holiday” might lead to some confusion about what you might think we are doing when you read that word.  Holiday =vacation right?  In this case it is when there is a gap, or missing information, in the survey data that is acquired.  This poses a problem for the survey technicians because this leaves holes in the data that they must use for their final charts.  Holidays can be caused by the boat or ship being off the planned line, unexpected shoaling (or where the water gets shallow) so the swath width decreases, or a slope angling away from the transducer so that a return path for the sound wave is not possible.  The speed, direction, weather, swells, rocking of the boat, and the launches making wider turns than anticipated. It is easy to see where holidays occur as we are surveying because amidst the rainbow of color there will be a white pixel or square showing that data is missing.  When we are finished surveying or “painting” an area, we communicate with the coxswain where we need to go back and survey over the missing data or holidays.  If there are holidays or data is missing from the survey, then the survey technicians must explain why the data is missing in their final Descriptive Report.  This document covers everything that was done during the project from how the area was chosen to survey, what data was collected, what data wasn’t collected and why.  This is where holidays are explained, which could be due to lack of time or safety concerns.

Ship Hydrographic Survey

This launch was a little different because we were cleaning up holidays from the Rainiers’ multibeam.  Not only do the smaller survey boats collect sea floor surface data, but the Rainier has its own expensive multibeam sonar as well.  The ships sonar is called a Kongsberg EM 710 and was made in Norway.  Having the Rainier fitted with a multibeam sonar allows the ship to acquire data in deeper water and allows for a wider swath coverage.  The lines that are surveyed on the ocean floor are also much longer than those in a launch.  This means that instead of taking around 5-10 minutes to acquire a line of data, it can take around 30 minutes or more with the ship.  This is great data because again, the ship can cover more area and in deeper water. We also took the ships previous data and ran cross lines over it.  The importance of running a cross line over previous survey data helps to confirm or deny that the data acquired is good data.  However, there is a catch to running a cross line.  To confirm the data they have to use a different system than what was used before, the cross line has to be conducted on a different day, and it has to be during a different tide.  All of this is done to know for sure that the data is acquired has as few errors as possible before the projects are finished.

Rainier Multibeam Sonar

Personal Log

Each day when the scientists go out and survey the ocean floor they acquire tens of gigabytes of information!  The big question is what is next after they have acquired it all?  When they are on the launch they have a small external hard drive that holds 500 gigabytes to a terabyte of information plugged into their computer.  At the end of the day all their information and files are downloaded to this hard drive and placed in a water tight container in case it happens to get dropped.  Keeping the newly acquired data safe and secure is of the utmost importance.  Losing data and having to re-survey areas due to a human error costs tens of thousands of dollars, so everything must get backed up and saved constantly.  This is where I have noticed that computer skills and file management are so important in this area of research.

Once we get off of the boats the data is brought upstairs to what is called the plot room.  This is where all the survey technicians computers are set up for them to work on their projects.  The technicians that are in charge of downloading all the data and compiling all the files together is called night processing.  There are numerous software programs (tides, CTD casts, POS, TPU, Hypack,) and data from these programs that all have to be combined so that the technicians can produce a finished product for the Pacific Hydrographic Branch (part of Hydrographic Surveys Division), who then process the data some more before submitting to Marine Charting Division to make the final chart. The main software program that combines all the different data is called Caris and comes out of Canada.  Once all of the data has been merged together it allows the technicians start cleaning up their data and produce a graphic plan for the launches to follow the next day.  Every movement on the keyboard or with the mouse is very important with surveying because everything is done digitally.  Numerous new files are created each day in a special way so that anyone that reads the name will know which ship it came from, the day, and the year.  File management and computer skills are key to keeping the flow of work consistent and correct each day.

Hydrographic Survey Data In Caris

We have also had numerous fire drills while on the ship.  This is very important so that everyone knows where to go and what to do in case of an emergency.  They had me help out with the fire fighters and the hose this time.  I learned how to brace the fire fighter so that the force from the hose doesn’t knock them over.  I never knew that would be an issue with fire fighting until this drill.  I learn so many new things on this ship every day!

Fire Drill Practice

Student Questions Answered


Kingfisher

Animals Spotted

Kingfisher

Sea Otters

Question of the Day

Staci DeSchryver: Don’t Hate, Just Calibrate! August 9, 2011

NOAA Teacher at Sea
Staci DeSchryver

Onboard NOAA Ship Oscar Dyson
July 26 – August 12, 2011 

Mission: Pollock Survey
Geographical Area of Cruise: Gulf of Alaska
Location: Barnabas Strait  57 deg 22.630 N, 152 deg 24.910W 
Heading: 67.8 deg
Date: August 9, 2011

Weather Data From the Bridge
Partly Cloudy Skies
Temp: 13.5 deg
Dewpoint:  6 deg
Barometric Pressure: 1020 mb, falling, then steady
Wind:  240 deg at 12kts
Seas:  Calm
stn model 08.11

Science and Technology Log

The start of my first official shift onboard the Oscar Dyson was an interesting one!  We had lost some time (11 days) to some complications, so our cruise goals shifted a bit from the original plan.  We had to focus on the most important aspects of the mission, and sacrifice carefully, as it wasn’t plausible to complete the entire mission in the time allotted.  One of the major steps for completing the season was to do what is known as a calibration.  In order to save time, we did the calibration on my first night out on the job!

Calibrations are typically done during the daytime because the fish are curious little beasts.  During the day, they move lower in the water column, and therefore do not interfere with the calibration of the system, mainly because they are so far away they are oblivious to it.  At night, however, they party at a shallower depth, and sometimes their acoustic signatures can mar the data collected during a calibration.  It is critical to the scientists that they calibrate the acoustic system accurately, and if there is a school of fish swarming the calibration tools, well, it’s a big ‘ole mess.  Given that we are on a shortened time schedule, it made practical sense to conduct the calibration overnight.

krill

Marshmallow has been very helpful on the trip. Here he is counting krill. I don't have the heart to inform him that these krill have already been counted.

Why do we calibrate the acoustic transducer?  Think of it like this.  Have you ever baked cookies before and followed the directions to the letter, only to have them come out of the oven like crispy critters or balls of goo?  Or, let’s say, you have a favorite recipe you use all the time, and you gave the recipe to a friend who makes the same cookies the same way, yet complains that they are overcooked?  Well, one of the reasons that the recipe may have not turned out was because either your oven, or your friend’s oven was not properly calibrated.  Let’s say, for example, the recipe calls to bake the cookies at 350 degrees for 15 minutes.

If you turn the dial to 350 degrees, it is reasonable to expect that the oven is, in fact, 350 degrees.  But there is an equal possibility that the oven is actually only 325, or maybe even 400 degrees.  How would you double check to see if your instrument is off its mark?  One solution is to heat the oven to 350, and use a meat or candy thermometer that you know has an accurate readout and then put the thermometer in the oven.  If the candy thermometer reads out at 350, you can be certain that your oven really is 350 when you turn it on.  If the candy thermometer reads out at 375, then you can be certain there’s an error in the readout of your instrument.  Calibration corrects for those errors.

downrigger

Here you see Cat and I showing off the downrigger - the piece of equipment that holds the calibration spheres under the ship.

Calibration on this survey is important because scientists use information from the acoustic transducer to determine the types and abundance of organisms in the water column.  If the instrument they use to make these predictions is off in any way, then all of the data they collect could be determined to be insufficient or unreliable.  Calibration also ensures that acoustic measurements (and survey results) are comparable between different cruises, locations, and times.

Calibration is done much in the same way as an oven is calibrated.     We take an object that has a known and reliable return rate on the acoustic transducer, and hang it below the ship.  Then, the scientists will “ping” acoustic soundings off of the object and see how well the return matches up with the known return rate.  If it’s off, then they can “tune” the transducers, much like a guitar is tuned.

downriggers ii

Here, the chief scientist, Chris Wilson, double checks our superior downrigging work!

It is only necessary to calibrate the transducers twice per survey – once at the beginning of the survey (one was done in June) and one at the end of the survey (which was now).  When the transducer is calibrating, the ship must be as close to stationary as possible.  This is why the lead scientist chose to do the calibration at night – we can’t calibrate and conduct assessment surveys at the same time.  Therefore, it’s a one-pony show when the transducer is calibrating.  Almost all other scientific field work ceases while the calibration is completed.

There are two materials used for calibration for this particular transducer on the Oscar Dyson.  The first is Tungsten Carbide, and the second is pure Copper.  These small, spherical objects are quite cleverly hung below the ship off of three downriggers attached to the port and starboard rails.  In order to hang the spheres, the strings on either side of the ship must connect.  In a sense, we ask the Dyson to “jump rope” to get the calibration sphere underneath the ship in the correct position.

Calibration takes about six to eight hours to complete.  I got to help with setting the downriggers up, changing out the calibration spheres, and breaking down the equipment.  As it turns out, the transducer only needed minor adjustments this time, which is pretty typical for the ship.  However, it’s important to double check so that if there is a problem, it can be detected early and corrected.

Personal Log

Today, the chief engineer of the ship, Jeff, gave us a tour of the engine room.  Holy cow, was that impressive!  I don’t know what I was thinking when I  thought that the guts of this beast were contained in one small room.  They most decidedly are not.  There are two whole decks below the lowest level I know of – and they are filled with all kinds of interesting equipment.  We got to see all of the engines (there are 4 diesel generators), where the water is purified for consumption, and all of the internal components of the winch system that lowers and raises our fishing nets.  As if that weren’t enough, we popped open a floor hatch, climbed down the ladder two flights, and got to stand right on the “skin” of the boat.  Translation:  The only thing separating my feet and the big blue sea was a thin little piece of metal.  It was so cool.  The ship is designed to be “acoustically silent” – like a stealth fighter, except they don’t call it stealth and we aren’t fighting enemies – we are hunting fish.  Because of this, many of the larger pieces of equipment are hoisted up on platforms that silence their working parts.  The ship has diesel-electric propulsion.

engine rm

Here is just ONE of the four massive engines on the ship!

This means that there are four diesel generators that make electricity,  which then gets split into two different forms  – one type is for propulsion, and the other is for our lights and other conveniences.  It sounds really complicated, and much of what the engineers do on board is quite complicated, but everything onboard is smartly labeled to help the engineers  get the job done.  I also learned today what the funny numbers on all of the passage doors mean.  See the caption for a description.

door signs

Here is one of the door signs on the ship, which act like a "you are here" sign on a map. The first number tells us what floor we are on. The second number tells us what area of the ship we are in. The third number tells us whether we are port, starboard, or in the center of the ship.

One thing that Cat and I were discussing this morning while searching through binoculars in Alitak Bay for interesting woodland creatures was that we can go pretty much wherever we want to go on this ship.  Everyone who works and lives here is so friendly and welcoming.  They answer any of our questions (even the silly ones) and they all have such cool life stories.  What’s better is that everyone is willing to share what they’ve learned, experiences they’ve had, and accomplishments they’ve achieved to make it here.  I am aboard a utopian city bursting with genuine people who love what they do.  Now, please understand that it’s not that I ever expected the opposite for even a single second.  The science and technology is definitely neat, but the people who live and work here are what is making this trip a once-in-a-lifetime experience.

Do you know….

Your Ship Superstitions?

1.  Bananas on a boat are considered bad luck.

2.  Black luggage for sailors is considered bad luck.

3.  One should never whistle – especially on the bridge or in the wheelhouse – you may whistle up a storm.

4.  To see a black cat before boarding is good luck.

5.  Dolphins swimming along the ship are good luck.

6.  Never sail on Friday – it’s unlucky.

7.  Never sail on the first Monday in April – also unlucky.

8.  Never say the word “Drown” on a ship, as it encourages the act.

9.  Sailors should avoid flat-footed people – they are bad luck.

10.  Never step onboard a ship with your left foot first.

Jason Moeller: June 25-27, 2011

NOAA TEACHER AT SEA
JASON MOELLER
ONBOARD NOAA SHIP OSCAR DYSON
JUNE 11 – JUNE 30, 2011

NOAA Teacher at Sea: Jason Moeller
Ship: Oscar Dyson
Mission: Walleye Pollock Survey
Geographic Location: Gulf of Alaska
Dates: June 25-27, 2011

Ship Data
Latitude: 55.58 N
Longitude: -159.16 W
Wind: 14.11
Surface Water Temperature: 7.2 degrees C
Air Temperature: 9.0 degrees C
Relative Humidity: 90%
Depth: 85.61

Personal Log
Anyone who has seen the show Deadliest Catchknows how dangerous crab fishing can be. Fishing for pollock, however, also has its dangers. Unfortunately, we found out the hard way. One of our deck hands caught his hand between a cable and the roller used to pull up the trawl net and hurt himself badly.

Cable

The cable and the roller.

Fortunately, the injuries are not life threatening and he will be fine. The injuries did require a hospital visit, and so we stopped at Sand Point to treat him.

Town

This is the town of Sand Point.

airstrip

Clouds hang over the hills at Sand Point. The airstrip is in the left edge of the photo.

We stayed at Sand Point for nearly 48 hours. What did we do? We fished, of course! We used long lines and hooks, and had a great time!

lines

Bill and Alex cast fishing lines in the harbor. We tied the lines off on the boat and hauled them up from time to time to check the bait.

Alex

Alex with a flounder that he caught! He also caught several cod and a 32-lb Pacific halibut!

cod

Cod and the flounder in a bucket!

Tammy

As with every fishing trip, we also managed to catch things that we didn't mean too! Tammy (the other NOAA Teacher at Sea) especially liked the kelp!

urchin

A few visitors always hitched a ride on the kelp we caught. Here is a tiny sea urchin.

crab

This crab was another hitchhiker on the kelp.

starfish

We were bottom fishing for Halibut, and a starfish, the largest one I've ever seen, went after the bait!

A one-day fishing license in Alaska costs $20.00. We had internet, so five of us went online and bought the fishing passes. Was it worth it?

Halibut

You bet it was! This is the 25-lb halibut I caught! It was AWESOME!!!

We filleted it and had the cooks make it for dinner. With the halibut, we also cut out the fleshy “cheeks” and ate them as sushi right on the spot! It doesn’t get any fresher (or tastier!) than that!

Science and Technology Log
Today we will look at the acoustic system of the Oscar Dyson! Acoustics is the science that studies how waves (including vibrations & sound waves) move through solids, liquids, and gases. The Oscar Dyson uses its acoustic system to find the pollock that we process.

The process begins when a piece of equipment called a transducer converts an electrical pulse into a sound wave. The transducers are located on the underside of the ship (in the water). The sound travels away from the vessel at roughly 1500 feet per minute, and continues to do so until the sound wave hits another object such as a bubble, plankton, a fish, or the bottom. When the sound wave hits an object, it reflects the sound wave, sending the sound wave back to the Oscar Dyson as an echo. Equipment onboard listens to the echo.

The computers look at two critical pieces of information from the returning sound wave. First, it measures the time that it took the echo to travel back to the ship. This piece of information gives the scientists onboard the distance the sound wave traveled. Remember that sound travels at roughly 1500 feet per minute. If the sound came back in one minute, then the object that the sound wave hit is 750 feet away (the sound traveled 750 feet to the object, hit the object, and then traveled 750 feet back to the boat).

The second critical piece of information is the intensity of the echo. The intensity of the echo tells the scientists how small or how large an object is, and this gives us an idea of what the sound wave hit. Tiny echos near the surface are almost certainly plankton, but larger objects in the midwater might be a school of fish.

good fishing

An image of the computer screen that shows a great number of fish. This was taken underneath the boat as we were line fishing in Sand Point.

poor fishing

The same spot as above, but with practically no fish.

fishing

An image of the screen during a trawl. You can actually see the net--it is the two brown lines that are running from left to right towards the top of the screen.

One of the things that surprised me the most was that fish and bubbles often look similar enough under water that it can fool the acoustics team into thinking that the bubbles are actually fish. This is because many species of fish have gas pockets inside of them, and so the readout looks very similar. The gas pockets are technically called “swim bladders” and they are used to help the fish control buoyancy in the water.

swimbladder

Swim bladder of a fish.

Species Seen
Northern Fulmar
Gulls
Cod
Pacific Halibut
Flounder
Sea Urchin
Crab
Kelp

Reader Question(s) of the Day
Today’s questions come from Kevin Hils, the Director of Chehaw Wild Animal Park in Chehaw, Georgia!

Q. Where does the ship name come from?
A. Oscar Dyson was an Alaska fisheries industry leader from Kodiak, Alaska. He is best known for pioneering research and development of Alaska’s groundfish, shrimp, and crab industry. Dyson was a founding partner of All Alaskan Seafoods, which was the first company actually controlled by the fishermen who owned the vessel. He also served on the North Pacific Fisheries Management council for nine years. He is in the United Fishermen of Alaska’s hall of fame for his work. The ship was christened by his wife, Mrs. Peggy Dyson-Malson, and launched on October 17, 2003.

Dyson

Oscar Dyson

launch

The launching of the Oscar Dyson

Q. How do you see this helping you teach at Knoxville Zoo, not an aquarium?
A. This will be a long answer. This experience will improve environmental education at the zoo in a variety of different ways.

First, this will better allow me to teach the Oceanography portion of my homeschool class that comes to the zoo every Tuesday. For example, I am in the process of creating a hands on fishing trip that will teach students about the research I have done aboard the Oscar Dyson and why that research is important. Homeschool students will not just benefit from this experience in Oceanography, but also in physics (when we look at sound and sonar) and other subjects as well from the technical aspects that I have learned during the course of the trip.

Scouts are another group that will greatly benefit from this experience as well. The Girl Scout council wishes to see a greater emphasis in the future on having the girls do science and getting real world experiences. While the girls are still going to desire the animal knowledge that the zoo can bring, they will also expect to do the science as well as learn about it. My experience aboard the Dyson will allow me to create workshops that can mimic a real world animal research experience, as I can now explain and show how research is done in the field.

The same can be said of the boy scouts.

In addition, one of the most common badges that is taught to boy scout groups that come in is the fish and wildlife merit badge. In the past, the badge has primarily focused on the wildlife aspect of this topic. However, I now have the knowledge to write and teach a fisheries portion for that merit badge, as opposed to quickly covering it and moving on. This will enrich future scouts who visit the zoo for this program.

A major focus for all scouts is the concept of Leave No Trace, where scouts are supposed to leave an area the way they found it. The fisheries research being done aboard the Dyson is focused toward that same goal in the ocean, where we are attempting to keep the pollock population as we found it, creating a sustainable fishery. The goal aboard the Dyson is similar to the goal in scouting. We need to be sustainable, we need to be environmentally friendly, and we need to leave no trace behind.

School children on field trips will greatly benefit, especially students in the adaptations section. There are some bizarre adaptations that I never knew about! For example, sleeper sharks slow, deliberate movement coupled with their fin and body shape basically make them the stealth fighter of the fish world. They can catch fish twice as fast as they are! Lumpsuckers are neat critters too! This knowledge will enhance their experience at the zoo during field trip programs.

Finally, I can pass the knowledge from this experience on to my coworkers. This will not only better the experience of my students, but it will also improve the outreach programs, the bedtime programs, the camps, and other programming done at the zoo.

Q. Are you old enough to be on a ship? You look like you’re 13???!!!!
A. SHHHHHHH!!!! You weren’t supposed to tell them my real age! They think I’m 24!

Michele Brustolon, July 1, 2010

NOAA Teacher at Sea
Michele Brustolon
Onboard NOAA Oscar Dyson
June 28 – July, 2010

NOAA Teacher at Sea: Michele
NOAA Ship Oscar Dyson
Mission: Pollock Survey
Geographical area of cruise: Eastern Bering Sea (Dutch Harbor)
Date: July 1, 2010

Weather Data from the Bridge

Time: 1400
Latitude: 58.19 N
Longitude: 170.01 W
Cloud Cover: 100%, dense fog
Wind: 11.49 knots
Air Temperature: 3.800 C/ 38.840 F
Water Temperature: 3.960 C/ 39.1280 F
Barometric Pressure: 1003.10 mb

Science and Technology Log

Here fishy fishy!
July 1st began by spending time in the Acoustics Lab learning about the equipment used to analyze the data. The Oscar Dyson has 5 transducers on its center board and 1 temporary transducer on the side of the center board that looks horizontally. The transducers allow us to see where the fish are. Because of where the transducers are placed, we can only see the pollock from 16m to the bottom. This means that if there are any fish between the surface and 16m they will not be detected. This is the near surface “dead zone”. Why this happens? The transducers are mounted on the bottom of the centerboard about 9 m below the water line, and near the transducer face (first 7 m), no good data are collected. Why it’s okay? Pollock tend to hang out in mid-water. Although a few baby pollock might be in the near surface “dead zone,” the majority of pollock will be in the area we are watching. There is also a bit of a “dead zone” at the other end near the ocean floor. Yesterday the bottom was around 69.35m.

Transducer data

Why acoustics?
Ideally, the acoustic data collection would allow us to track aggregations of pollock without actually having to fish them out of the water. All parties involved (scientists, fish, bank accounts) would benefit from this change but scientists are still in the process of perfecting this process. The Oscar Dyson is part of a fleet of five boats that was specifically designed for acoustics. Specifically, it is considered a “quiet boat” where the engine noise is decreased to prevent scaring the fish. Other Acoustic projects include: Pacific hake off the coast from California to Vancouver Island (run as a joint project with Canada), herring in the northwest Atlantic, and krill in the Antarctic. Acoustics are used throughout the globe and many countries depend on acoustics for their fish surveys.

A little help from UNH!
Along with the transducers, there is also a multibeam SONAR that produces the same information as the transducers but with a wider angle range. The multibeam ME70 sends its signal out after the transducers information is sent and returned. They alternate about 1.5 seconds apart. The University of New Hampshire (UNH) is helping to use the tool and also to analyze the data. To analyze the transducer data collected, a program is in place from Tasmania to help determine what the boat is seeing. The scientists use the program to help separate species in the water column. Scientists utilize the multibeam ME 70 along with the transducers and fish trawling to ensure they are capturing an accurate picture of the mid-waters.

Multibeam ME70 data

How the survey data we collect are used. The data we collect on the Oscar Dyson during the summer pollock surveys are used by scientists and policy makers to determine the fishing quota (the “take”) of pollock for the next season. Quotas are important for maintaining the population of pollock (and other species) for this generation and generations to come. The data we collect on the Oscar Dyson help ensure that maximum stock can be taken without negatively impacting the Eastern Bering Sea pollock population.

Here I am deploying the XBT (eXpendable bathymetric thermograph)

Personal Log

Although there was no fishing yesterday, I certainly was able to be involved. I launched the XBT off the Hero Deck just as we began our fire drill. Once that was completed I returned to the Acoustics Lab until we were cleared from the drill. We then had our abandon ship drill where we get our survival suits and head to our assigned position. My meeting location is at life raft 3 and 4. Once we learned how to deploy our life raft, we headed inside to the conference/lounge to practice donning our suits. While this is very serious, it is also worth a laugh or two watching people struggle and become orange gumbies! The goal is to be able to don your suit in under 60 seconds!

Zodiac ride into the cove of St. Paul’s Island

Yesterday I had the opportunity to head into St. Paul’s Island; the largest of the Pribilof Islands. St. Paul’s is also called the Galápagos of the north. The Zodiac was driven by Joel Kellogg and Amber Payne, and our CO (Commanding Officer Mike Hoshlyk) allowed Katie, Rebecca, and I the opportunity to take the trip inland. Our mission while on land was to bring science equipment (ice-flow detector) to the airport that needed to be sent to Anchorage. Stepping foot onto St. Paul’s Island seemed eerie and mysterious. There was the lurking fog along with a very industrial feel to the island. Because most of the island consists of coalescing small volcanoes, the sediment’s dark color is due to lava flow which didn’t brighten the land at all. We did not see many people other than those working on dredging the new causeway or the people in the airport. Our taxi driver said that they hadn’t gotten mail since Monday and it was Thursday which explained why the people waiting for flights at the airport seemed a bit anxious. On our way back to the boat, we were able to see sea lions and some puffins hanging out in the water and around the break wall. As we approached the boat, it was like an apparition appearing before us. Just another once in a lifetime chance that I have had this cruise!

Want more information about the Pribilofs? Check out http://www.amiq.org/aleuts.html

Oscar Dyson coming back from Pribilofs

Animals Seen

Auklets
Murre (2 different types differentiated by bill type)
Fox
Puffins
Sea lions

(but no fur seals…everyone told me I would see them but they were missing. It seems to be a question everyone is asking.)

Word of the day

Desmadre: troublemaker

New Vocabulary

Transducer: instrument used to send out signals that return and show where fish are located
Ground fishing: trawling on the ocean floor