Tag: fish abundance

NOAA Teacher at Sea
Laurie Degenhart
Onboard NOAA Ship Delaware II 
July 14-25, 2008

Mission: Clam Survey
Geographical Area: North Atlantic
Date: July 23, 2008

Weather Data from the Bridge 
Winds at 170° at 23 knots
Sea temperature: 18.9° C
Air temp 22.6° C
Swells: 1
Atmosphere: Clear

Science and Technology Log 

The last two days have been less hectic.  The scientists have had to make several repairs.  The sensors on the dredge were having problems recording data.  Sean Lucey, Chris Pickett, and TK Arbusto, as well as other scientists have spent several hours replacing sensors and making sure that the sensors were logging accurate data.  In order for the survey to be reliable the scientists at sea and in the lab decided that the ship needed to return to previously tested sites to  insure that the sampling techniques had not changed with the changes in the sensor.

We have sampled both Quahogs and Surf Clams today.  It seems that some locations are dominated by the Quahogs, while others are mainly Surf Clams. The weather has been hot and humid.  So far in the trip, the Delaware II has been able to avoid the storms farther to the south. Tonight however, the winds are starting to pick up. We may see rain! Today I climbed up in the dredge compartment when it was full of clay.  Even though I knew that the dredge was very safe, I still worried that I might fall into the ocean.  The clay was very dense with rocks. Sean Lucey, chief scientist, used a high pressure hose to loosen the majority of the mud, but it was still a big slippery muddy job.  John, the Chief Bosun, told me that a full load of mud weighs almost 9000 pounds!  There were very few clams in the load.

Personal Log 

This shift has been very busy. The tows have been pretty much back to back.  All the people on my shift have formed a great team.  Though the work is hard we seem to be able to make it fun….

I continue to be impressed with the NOAA officers and scientists.  The scientists have to have knowledge of oceanography, marine biology and statistics in order to execute accurate sampling.  Another area of expertise is in trouble shooting all the scientific equipment… after all there is no running to the hardware store for spare parts. Today when the sensors broke the scientists, mechanical engineers, and the bosun had to work together to correct the problem.

Both the NOAA officers and the scientists have to be able to cope with volunteers (me included) that have no knowledge of life at sea. Each new crewmember has learn to fit in…I’m sure that this tries the patience of the seasoned crew.  Being aware of all the ins and outs of life at sea is quite a learning process. For example, I went to the bridge after dark… it seemed to be pitch black…. actually the Executive Officer was “on watch”  having the lights out made it easier for him to see both the ocean and the electronic equipment that he had  to use in order to safely captain the ship.

One of my goals for the trip is to put together a collection of photographs that depicts all the aspects of life aboard the Delaware II.  So far I have over 300 photographs.  The crew seems quite pleased…many members ask if I can take more pictures.

During this voyage I have learned a great deal about how a ship runs.  I am very pleased to have had the opportunity to work aboard the Delaware.  I will create a DVD with the images and video clips that I have gathered. I want to share my experience with students, teachers, and student teachers. NOAA offers great resources for educators and a vast selection of careers for those who wish to live a life that is rewarding and exciting.

NOAA Teacher at Sea
Laurie Degenhart
Onboard NOAA Ship Delaware II 
July 14-25, 2008

Mission: Clam Survey
Geographical Area: North Atlantic
Date: July 20, 2008

Weather Data from the Bridge 
Winds at 200° at 23 knots
Sea temperature: 24.2° C
Air temp 24.6° C
Swells: 0
Atmosphere: Clear

Science and Technology Log 

We are now into day 7 of our clam survey.  Everyone on the ship pulls together as a team to make each tow a success.  Each location for a dredge site is called a station.  The NOAA crew in charge of the ship must not only be at exactly the correct longitude and latitude, but the depth of the water, the speed of the tow, and the condition of the sea (waves and swells) must also be considered. There are three separate places on the ship where these decisions are made.  The bridge controls the location of the ship and notes the conditions of the sea.  The chief bosun controls the dredge towing. He manages the cables, depth, and length of the tow. The scientist in the lab choose the exact location of the tow and the depth.  The scientists use sensors attached to the dredge to log data about the tow. The bosun reels the cable back to the ship and onto the platform.  After the tow has been made the deck hands secure the dredge compartment where the catch is.

The scientific crew then measures and counts the clams.  A scientist from the FDA, Stacey Etheridge, has the science crew shuck a certain number of clams.  She then homogenizes them in a food processor to take back to the laboratory to test for possible toxins.  The NOAA scientists collect data on the different types of clams as well as the size and weight.  They are also trying to determine the age of the clam given the rings on the shell. In addition to the scientist on the Delaware II, there is an entire NOAA crew.  There are engineers, ship’s officers, and fishermen.  Everyone has specific assignments.  The NOAA officers are at sea approximately 244 days a year.  The NOAA careers website here.

Personal Log 

The scientists must have many skills in order to keep the study going.  Not only do they have to know about the clams, but also how to fix problems with the computer program and its sensors, as well as the mechanical operation of the dredge equipment.

The weather at sea has been very hot and humid.  The hours are long. We do approximately 10 tows on a twelve-hour shift.  Think about this… each tow gathers around 4 thousand pounds of material off the ocean floor.  That makes 40,000 pounds.  There are 7 people on our shift. That means each of us sorts and moves around 5700 pounds in a shift…. that’s as much as a small car!  I guess I can have dessert with lunch today.  The work is enjoyable.

Tina and I have shucked over 500 clams.  We ROCK, or should I say CLAM, at shelling Quahogs.  The Captain told me that we may feel the effects of tropical storm, Cristobol.  I sure hope I don’t get seasick.  I learned a new skill…swabbing the deck.  It is amazing the range of tasks each crewmember has to have to keep the ship running smoothly.

Our Chief Scientist, Sean Lucey, oversees all of the roles of the scientists and volunteers.  It’s a big job and he sets the tone for the rest of us.  Everyone is positive and willing to do whatever is needed. Jakub, the Watch Chief, oversees the general operation of sorting and measuring the clams.  Both Sean and Jakub are great at teaching me the ropes so that I can do my best.  One time as I was on my way to my “station” Sean remarked,  “I know you’ll be ready.”  I thought that was great, sometimes I get anxious about doing the exact right thing at the right time.

I am starting to think about the lesson plans that I am going to write.  I want to make a simulation of a clam survey for elementary students using Oreo Cookies to gather data.  Sean is going to give me data from the trip to use in my lesson plans.  One of my goals for my presentations is to go to various Vocational Classes to talk about all the facets of NOAA as a career path. I also want to develop a presentation about the roles of a scientist, showing the different aspects of the skills that they have.

Once again the meals have been great.  I was told that the Stewards, John and Walter, have a reputation for providing the best food of all the NOAA ships.  Sure seems right to me!  We have had great meals. One night we had Sea Bass, another night we had lamb chops.  There is always an abundance of vegetables and fruit. Then there is dessert… apple pie!

NOAA Teacher at Sea
Laurie Degenhart
Onboard NOAA Ship Delaware II 
July 14-25, 2008

Mission: Clam Survey
Geographical Area: North Atlantic
Date: July 15, 2008

Weather Data from the Bridge 
Winds at 200° at 7 knots
Sea temperature: 20.7° C
Air temp 24.4° C
Swells: 160 4’ 12 sec.
Atmosphere: Clear

Science and Technology Log (Monday, July 14 – Thursday, July 17) 

We set sail midday on Tuesday, July 15, 2008. Monday was spent with repairs. We heard a presentation by Dr.Larry Jacobson, the head of the Clam Survey Project.  He explained that there was a general shift in the populations of Surf Clams and Ocean Quahogs.

This study is collecting data for his team to use in determining the changes and possible causes of the change.  NOAA and the clam fishing industry enjoy a good relationship, working handin-hand to protect the clam population and promote clam fishing. We were taken to the NOAA storeroom and outfitted with our “foul weather gear.” We wear the gear on board to sort and shuck clams. We each were issued boots, yellow bib overalls, and an orange rain slicker….I look quite dashing.

Chief scientist, Sean Lucey, gave us a general description of the work that we would be doing.  Sean stressed how important accuracy is in all the facets of the Clam Survey.  There are several assignments.  Each person is assigned a shift.  My shift is from Noon until midnight.  That’s 12 hours! We are not to return to our room until our shift is over, because the other women I share the room are on the opposite shift and will be sleeping. I am on a team with Jakub Kircun, as the Watch Chief.  He is very patient and kind, even when I make a mistake.  There are seven people on our team: four NOAA scientists, one graduate student who is studying plankton, one volunteer, and me, the Teacher at Sea.

General Description of a Clam Dredge 

The back of the Delaware II has a large metal dredge (it looks like a giant square shifter-See photo.) The cage is lowered to the sea floor at pre-determined random locations and dragged by a special cable called a hauser for exactly 5 minutes.  Then the dredge is hauled back to the boat and its contents are dumped on a platform.  We all sort through the dredged material sorting out clams and other sea life, throwing the rest back out to sea. The clams are measured, weighed, and some meat specimens are taken for examination.  Computers record a vast array of information for the scientists.  Sean Lucey (Chief Scientist) is always making decisions where we go and provides the lab and other scientists information about the catch.  The team does around 10 or so tows in a twelve hour shift.

First Assignment 

I was assigned by, Jakub Kircun, Watch Chief, to record information about the tow a using computerized data collection system called SCS (Scientific Computer Systems). I go into a room on the bridge and listen to the deck department communicating with the bridge and I record when the dredge is on the bottom, towing, and back on deck.  The information is tracked in SCS with button pushers. I also log information about wave height, swell direction, and swell height, which I receive from the officer on watch.  I also need to record depth, time, and speed of the boat during a dredge tow. This provides accurate data for the scientists back on land to analyze. As soon as that part of my job is finished, I come down stairs to help sort and shuck the clams..

Personal Log 

Holy Cow, a 12 hour shift….from noon until mid-night!  I was worried, but the shift seems to fly by. There is always something that needs to be done.  I was assigned by Jakub Kircun, Watch Chief, to record the sensors for the dredge itself.  What a responsibility!!! Talk about pressure.  Sean, Chief Scientist, has been really great. His sense of humor has helped ease my stress.  I never realized how much computers are used aboard a ship to monitor experimental data.  Not to mention the general running of the ship….. There are 31 computers in all. For each tow which Sean and Jakub call a station, I do the recording for the dredge then come down stairs…put on my boots and bib overalls and head out to sort the clams with the others on my team.  It’s a big job…good thing I am used to working in the woods of Wyoming… otherwise, I don’t think I could keep up!!!

After we sort the clams, Tina, a graduate student from University of Connecticut, and I measure and weigh the clams using a special computerized machine called a Limnoterra Fish Measuring Board. Tina and I are becoming great clam shuckers. We need to weigh the clams both with and without the shell. Joe, the other volunteer, also helps weigh and shuck the clams.  Sometimes they are sweet smelling… but sometimes not!  They look nothing like Howard Johnson’s Clam Strips!

I have started a shell collection to bring back to my school.  I will be working with the Science Coordinator to design science experiments that use data from our trip.  The Chief Scientist, Sean Lucey, is working with me to develop lesson plans that use the data being collected. Just learning to find my way around the ship has been a challenge.  I’ve learned to find the galley…. great food. Walt and John, the ship’s stewards, are fantastic chefs.  Today we had crab cakes with lemon sauce, vegetables, and peach cobbler with whipped cream for dessert.  I am telling myself that as much physical work as I am doing I can eat what I want….that’s my story and I am sticking to it!

All the crew has been welcoming and accepting.  Richie and Adam, NOAA crewmembers, take care of securing the dredge. It looks like a dangerous job to me!  They both have a great sense of humor.