Category: Claude Larson

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Claude Larson, August 2, 2007

NOAA Teacher at Sea
Claude Larson
Onboard NOAA Ship Albatross IV
July 23 – August 3, 2007

Mission: Sea Scallop Survey
Geographical Area: North Atlantic Ocean
Date: August 2, 2007

larson_log5Weather Data from the Bridge 
Air Temperature: 15.4° C
Water Temperature: 15.2° C
Relative Humidity: 96%
Wind Speed: 11 knots
Wind Direction: SW

Science and Technology Log 

Well with 202 tows behind us, the ALBATROSS IV is headed for Woods Hole. It has been a busy 10 days and the scientists and crew are tired, yet anxious for their return home to their family and friends.  Reflecting on the Sea Scallop Survey cruise, I have a new found and deep respect for the gritty science that this group does. The wealth of knowledge that the scientific team brings to the survey is extremely impressive.  The experience and skills of the crew afforded us the opportunity to conduct scientific research in a most effective manner.  The specifically designed technology that is utilized on board shows the depth and breadth of understanding that goes into a project of this undertaking. The years of work that have gone into the planning and execution of this project from its beginnings to the present, some thirty years later, are evident as each task has been streamlined for effective sample collection and data analysis.  It has truly been a hands-on experience with top notch scientific research for practical application. I feel privileged to have met and worked with the people aboard this ship.

Along with having the opportunity to learn and experience the marine science that is presented here in the North Atlantic, it has been my pleasure to meet and get to know the people on the ALBATROSS IV. In the eleventh hour of a watch when your energy resources start to dwindle, there is always someone to make you laugh, lend you a hand and help you find the fun in what would otherwise be considered arduous amounts of work. The crew, from the bridge to the engine room, has been so friendly and has shared their stories and humor throughout our time on board.  It is an experience like no other I have ever had. I am glad I took every opportunity I had to sit and talk with them and listen to their histories and future plans.

Although thanks doesn’t seem like nearly enough to say, this is one final thank you to NOAA for opportunity to sail on this cruise, to the crew for their efforts to help us a million different ways and to the scientists for all that I have learned and experienced.  I will certainly have stories to share and memories to keep for a long time.

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Claude Larson, July 31, 2007

NOAA Teacher at Sea
Claude Larson
Onboard NOAA Ship Albatross IV
July 23 – August 3, 2007

Mission: Sea Scallop Survey
Geographical Area: North Atlantic Ocean
Date: July 31, 2007

Weather Data from the Bridge 
Air Temperature: 17º C
Water Temperature: 18.3º C
Wind Speed: 10.8 knots
Wind Direction: W Latitude: 41 24.54 N Longitude: 66 34.50 W
Cloud Cover: 8/8
Humidity: 100%

Dive Master and Executive Officer Kurt Zegowitz (left) and Commanding Officer Steve Wagner (right) inspect the hull of the ALBATROSS IV prior to setting sail.
Dive Master and Executive Officer Kurt Zegowitz (left) and Commanding Officer Steve Wagner (right) inspect the hull of the ALBATROSS IV prior to setting sail.

Science and Technology Log 

NOAA ships are equipped with the necessities for successful scientific research and sea voyages. Much of which goes unnoticed, unless a specific set of circumstances arises.  With these capabilities, there is an understanding that not only does the ship have a wealth of material resources, but the ship’s crew has been trained in the operation, maintenance and procedures required for use of all of these devices.  One aspect of gear and training I’d like to focus on is this log entry is the SCUBA capabilities on board. I caught up with the ship’s Dive Master and Executive Officer, LCDR Kurt Zegowitz to get a better understanding of what the SCUBA team does on board the ALBATROSS IV.

The ALBATROSS IV SCUBA team also includes crew members Commanding Officer Steve Wagner, Operations Officer ENS Chris Daniels, and Navigation Officers ENS Chad Meckley and ENS Chris Skapin. Their primary responsibility is ship husbandry or taking care of the ship’s hull. To ensure proper operation of the ship the hull must be inspected, usually before each sail.  The propeller is checked for line entanglement.  The bow thruster, transducers and sea suction intake grates are also cleaned.  The sea suction intake grates allow sea water to be brought in to cool the engine as the boat steams along.  While in Woods Hole, the crew also helps the aquarium by clearing the intakes for their sea water supply.

Some other aspects of SCUBA team work throughout NOAA include research, sample taking and fish collecting. For example, on research trips off of the Hawaiian Islands scientists will have the divers collect species of fish and other sea creatures for scientific study. In order to collect fish, the divers use a Hawaiian sling and collect the fish in a bag that is attached to their leg and towed behind them at a distance of about 30 feet.  This precaution protects the divers in the event that a shark in search of the injured fish is in the area.

NOAA Corps personnel who choose to receive SCUBA training can go to one of two sites, Seattle, Washington or the Florida Keys.  The basic training requires three intense weeks of work with SCUBA gear and dives.  Upon completion of the training they receive the title of working diver and with increased experience and training can move up to advanced diver, master diver and diving instructor.  NOAA divers are required to dive every six weeks and do so in both warm and cold water.  They have wet suits for warmer weather and dry suits for colder months.

Now for a quick physics lesson. The SCUBA air tanks are filled with compressed air and weigh approximately 35 pounds when full.  Which is quite a lot to tow around on land however, in the water the buoyant force equalizes the weight and the divers can float easily even with the 35 pound weight on their backs.  The air lasts for approximately 40 minutes give or take, depending on their rate of breathing and lung capacity.  The divers must also wear weight belts to help them stay submerged easily.  Some physics here again, the larger you are the more buoyant you are and the leaner you are the less buoyant you are. This means that if you a larger person you will need a heavier weight belt to keep you submerged, whereas a thinner person will only need a small amount of weight.  Again, these belts feel like they’d be rather uncomfortable to wear on land, but with the counter force of buoyancy the divers do not feel the weight once they are in the water.

Although modest about his skills, it is obvious that Kurt is an accomplished diver and that he enjoys it thoroughly. SCUBA training has given Kurt opportunities to dive in Hawaii, Alaska, Seattle, New England and the Chesapeake Bay.  He’s been up close and nosey with tiger sharks at 80 foot depths and has seen giant kelp beds and coral reefs.  Executive Officer LCDR Kurt Zegowitz encourages anyone from the Corps who is interested in becoming SCUBA certified to go through training with NOAA.

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Claude Larson, July 26, 2007

NOAA Teacher at Sea
Claude Larson
Onboard NOAA Ship Albatross IV
July 23 – August 3, 2007

Mission: Sea Scallop Survey
Geographical Area: North Atlantic Ocean
Date: July 26, 2007

Weather Data from the Bridge 
Air Temperature: 21.9º C
Water Temperature: 22.6 º C
Relative Humidity: 91%
Wind Speed: 8 knots
Wind Direction: S

Melissa Ellwanger (left) and Stacey Etheridge (right)check the results from the test strips for PSPs.
Melissa Ellwanger (left) and Stacey Etheridge check the results for PSPs.

Science and Technology Log 

The ALBATROSS IV is well underway with the second leg of its Sea Scallop Survey for this year. After several tows we have collected, counted, weighed and measured not only sea scallops but, several types of fish, crabs and starfish.  As a teacher, I would like to focus on the application of some the science that is going on here on the ship. Specifically, I want to explain the work of two scientists on board Stacey Etheridge and Melissa Ellwanger who work at the FDA, Food and Drug Administration.

Sea scallops are studied by NOAA because of their importance commercially.  People enjoy them baked, fried, sautéed and served up hot. In other parts of the world, Europe and Asia, certain parts of the scallops are valued commercially as a food source. These parts are the gonads and viscera, or internal organs and membranes.  Last year the FDA had to close certain fishing areas were closed to bivalve molluscan harvesting because PSPs, paralytic shellfish poisoning toxins were too high for human consumption.  These toxins accumulate in filter feeders and thus harvesting was closed to organisms such as surfclams, mussels and quahogs. Sea scallops could still be harvested for the adductor muscle only. Toxins in scallops, however, build up in the gonads and viscera. If a person were to eat these affected seafoods they could actually become paralyzed and it could be fatal unless the victim receives respiratory support.

The toxins are produced by certain algae that are found in the environment with the scallops. The toxins vary in potency and can actually become stronger after the scallops eat them by interacting with the digestive processes of the sea scallop.  This leads us to Stacey and Melissa’s experiment. At each collection of sea scallops, they collect twelve random sea scallops to test.  They dissect the scallop and separate the gonad and viscera and test them separately.  They puree the organs, add extraction chemicals, filter them and then test the liquid that they filter from the organs on little test plates that look like test strips people use when they are trying to find out if they are pregnant.

The preliminary results from some of the samples they have collected have been positive for PSPs. This raises the question about whether or not those collected scallops can be sold for all of their parts or just the meaty section.  The work Stacey and Melissa are doing with NOAA and the FDA is an excellent example of applied science that benefits people and helps improve one of their food sources.

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Claude Larson, July 25, 2007

NOAA Teacher at Sea
Claude Larson
Onboard NOAA Ship Albatross IV
July 23 – August 3, 2007

Mission: Sea Scallop Survey
Geographical Area: North Atlantic Ocean
Date: July 25, 2007

Weather Data from the Bridge 
Air Temperature: 21.7° C
Water Temperature: 22.9
Relative Humidity 93%
Wind Speed: 10 knots
Wind Direction: SE 120

Jakub Kircun teaches Claude Larson how to insert the probe that measures inclination in the top of the dredge equipment.
Jakub Kircun teaches Claude Larson how to insert the probe that measures inclination in the top of the dredge equipment.

Science and Technology Log 

Today was the beginning of our first 12 hour watches. The tows were relatively well spaced which allowed for ample clean up time between tows and even for a little down time as we steamed for over an hour and I have a few minutes to write this log entry.

As I learn the skills needed to be useful on the Scallop Survey, I want to give you an idea of how a tow is carried out. The bridge generally gives us a ten minute alert before a tow over the all call system.  From that point we can finish up what we are doing and prepare for the tow. A crew member operates a huge winch and block and tackle that moves a thick metal cable. The cable is attached to a large metal hook that is attached to an 8 foot wide dredge net. The net is raised from the aft deck of the ship and put in the water.  The dredge net is then towed for fifteen minutes and then lifted onto the deck.  At this time, a probe that measures inclination is inserted in the dredge rigging and information about the collection of the tow is recorded and loaded onto another computer for later use.

While the probe is being read, someone takes a picture of the pile of organisms on deck with a small whiteboard with important information.  This information includes the station number, stratum and tow number, as well as whether this area is open or closed to commercial fishing.

The watch crew then brings baskets and buckets over to the edges of the pile and kneels on cushions to sift through the collected material.  We sort the collection into sea scallops, fish and, on each third tow, we also collect crabs. After a few minutes we shift areas and continue to look for certain animals, this helps us to make sure we have found all of the organisms we are looking for.  The fish are then further sorted by species.  The watch chief weighs each separate species and records that information on the FSCS, Fisheries Scientific Computer System. There are three FSCS stations and we all get to work at one of them.  The computer allows you to take the scallop or fish and lay it on a long board. The organism is held along the front panel of the system and a magnet is placed at the other end. The magnet causes the computer to automatically record the length of the scallop or fish. From there some of the scallop shells are cleaned for a scientist back in Woods Hole, Dvora Hart, and carefully labeled and placed in a cloth bag. Some of the scallops are also dissected for an FDA study on PSPs, paralytic shellfish poisoning. When ever we catch a monkfish, also known as a goosefish, one of the scientists on the watch crew dissects it for vertebrae for a study they are doing on aging the fish and its reproductive stage.

Once all the organisms are measured, weighed, dissected or cleaned, the remainder of the pile is shoveled in large baskets and thrown back into the ocean.  Each basket and bucket is rinsed as is each FSCS station.  If another tow is arriving shortly, the watch crew prepares for repeating this process. The steps happen in relatively that order, however they also occur in a sort of unison and the watch crew starts to form a rhythm.  The watch chief and veteran crew members help any of the new folks on board, which is great since we are sometimes unsure what to do next or how to do a new task.  The old saying of many hands make light work definitely applies here. With each tow there are surprises to dig for. Sometimes you get to see large egg cases or beautiful shellfish and unusual fish.

With all of this said, the all call has just given us a ten minute to station call.  I must get ready for whatever treasures will be brought up with this collection.

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Claude Larson, July 24, 2007

NOAA Teacher at Sea
Claude Larson
Onboard NOAA Ship Albatross IV
July 23 – August 3, 2007

Mission: Sea Scallop Survey
Geographical Area: North Atlantic Ocean
Date: July 24, 2007

Weather Data from the Bridge 
Wind speed: 13 knots SW
Atmospheric Pressure: 1019 mB
Cloud cover: 4/8 cirrus, stratus and cumulous
Air temperature: 18.3º C 65º F
Water temperature: 18.9 º C 66 º F

Teacher at Sea, Claude Larson, waves hello from the aft deck of the Albatross IV as she dons her immersion suit during an abandon ship drill.
Claude Larson waves hello from the aft deck as she dons her immersion suit during an abandon ship drill.

Science and Technology Log 

Although our departure date was delayed by one day due to some problems with the air conditioning system that cools the staterooms, we are glad that the problem has been resolved and we are underway on Tuesday, July 24. We left from the dock at approximately 9:00 AM under partially cloudy skies and with a light breeze. Just as I was standing on the hurricane deck enjoying the view of the diminishing landscape, there is an all call onboard and we are asked to muster in our stations for a fire drill.

We gathered all of our emergency gear and met in the wet lab area of the ship. In a few minutes, an abandon ship drill is announced and we head out to our life raft assignments and don our bright red immersion suits.  They are a bit of a task to put on, but provide ample protection should we ever actually abandon ship. They are known as the “Gumby Suits” and I have made that my first image in my log of this cruise.

A few minutes after we put away our emergency gear, the Chief Scientist, Stacy Rowe asks the crew for a test tow to ensure that all of the equipment we will need to survey the scallops is in working order. This is a great opportunity for those of us who are new on board to see how the procedure works. The deck hands skillfully direct the large dredge net over the back of the boat and release a specific length of cable based on depth of the water.  Unfortunately, during the first attempt the net flips and does not collect any specimens.  However, the second tow is more successful and allows us to get a collection of organisms large enough to sample.

Those of us who have never been on a scallop survey before get to work.  While kneeling on mats we sort through the pile for any living organisms.  These are put in blue buckets. The organisms are then sorted by species and we get a hands-on lesson from Larry Brady, our Watch Chief on how to identify certain organisms.  Once all the species are identified and sorted, we weigh them, count them and measure the length of a few using FSCS, the Fisheries Scientific Computer System. The deck, baskets and buckets are cleaned and put back until the next tow. Our next tow is south of Long Island, approximately 87 nautical miles away, so we take the opportunity to enjoy a quick lunch break and some down time until we are on our modified watch schedule from 6 PM to Midnight.

I am looking forward to our first official tow and the treasures we will find there.  Hopefully my body will have made some adjustments to the rocking and rolling of the ship as we steam through the Atlantic.  In the meantime, I will leave you with my question of the day.

Why would scientists who are studying the overall health of an ocean environment collect and study organisms from the bottom of the ocean?