Duane Sanders, June 12, 2009

NOAA Teacher at Sea
Duane Sanders
Onboard Research Vessel Hugh R. Sharp
June 8-19, 2009 

Mission: Sea Scallop Survey
Geographical Area: New England Coast
Date: June 12, 2009

Weather Data from the Bridge 
Wind: Speed 15.4 KTS, Direction 171.8 degrees
Barometer: 1008 millibars
Air temperature: 16.56 0C
Seas: 3-5 ft.

Science and Technology Log 

It is the end of my watch and I am ready for a break.

It is the end of my watch and I am ready for a break.

The routine of dredging for scallops 24 hours a day continues.  Since the goal of this survey is to get a good understanding of the entire ecosystem where scallops might live, we take samples from areas closed to commercial scalloping as well as from open areas. Every catch is a little different in the numbers and types of organisms we find.  There is a huge difference in scallop counts between areas that have been open for a time and those areas that have been closed. I can understand clearly the importance of checking this ecosystem on a regular basis. Open areas can become overfished and need time to recoup their losses and should be closed for a period of time.

In terms of dollar value the scallop industry is the most valuable fishery in New England. It would be decimated from overfishing without proper management based on sound, scientifically obtained data.

Personal Log 

I have adapted to standing watch at night and sleeping during the day. This experience has helped me to more fully appreciate the finer things in life: sunrise, good food and sleep. Also, I am proud to report that, thanks to some of my fellow ‘watchmates’ I am now ‘BlueTooth competent.’ They showed me how to use Bluetooth on my computer while we were winding down after our watch.

Duane Sanders, June 10, 2009

NOAA Teacher at Sea
Duane Sanders
Onboard Research Vessel Hugh R. Sharp
June 8-19, 2009 

Mission: Sea Scallop Survey
Geographical Area: New England Coast
Date: June 10, 2009

Weather Data from the Bridge 
Wind: Speed 19.4 KTS, Direction 86.8 degrees
Barometer: 1013 millibars
Air temperature:  14.2 0C
Seas: 2-3 feet

I’m having fun at the sorting table.

I’m having fun at the sorting table.

Science and Technology Log 

The primary mission of this cruise is to complete the second leg of a three-leg survey of scallop populations along the New England Coast. Other information about the scallop ecosystem is also collected. Scientists evaluate the status of the scallop fishery use data gathered from the survey.  Decisions about which areas to allow commercial scalloping and which areas to close to commercial use are based on these surveys. These science-based management decisions help to promote long-term stability of the scallop industry.

Members of the day watch working at measuring stations.

Members of the day watch working at measuring stations.

After two complete watches, I think I understand the procedure. Stations to be sampled are determined by a stratified random sampling procedure. Computers, following certain parameters set by NOAA staff, determine which area is to be sampled. It is important to be consistent so that each station from each of the three legs of the cruise can be reliably compared other data from this survey as well as from other years.  Once the captain puts the ship on station, an eight-foot wide dredge is lowered to the bottom and dragged for 15 minutes.  The captain keeps the ships speed to a constant 3.8 knots.  When the dredge is hauled in, its contents are dumped on a large steel sorting table that is bolted onto the to deck. The science team on watch sorts through the contents of the catch and separates all scallops into one basket, all fish into a different bucket and all the rest of the haul into another basket.

We then determine the total weight of the scallops and measure the length of each one. Thankfully we use a computerized system for determining the lengths which automatically record them.  All of the fish are sorted by species, and then weighed by species.  The length of each fish is recorded using the same system as for the scallops. The total volume of the remaining haul is estimated with each basket being equivalent to 46 liters. The general contents of the basket are characterized by types of shells found, types of substrate material and other organisms present.

Personal Log 

A sea mouse (Aphrodite aculeate)

A sea mouse (Aphrodite aculeate)

I have been assigned to the night watch. This means we work from midnight to noon. Although I am doing better today, it has been difficult to adjust to sleeping during the day. I am sure that I will continue to adapt. As long as Paul, our cook, keeps preparing his delicious meals I will survive quite nicely!

I have really enjoyed seeing the variety of organisms that come up in the dredge.  My favorites are the invertebrates. Some examples include different species of starfish, other mollusks beside scallops, and sea mice.  A sea mouse is actually a marine worm in the group known as polychaetes. These strange looking creatures grow long, thin scales that looks like fur. Their bodies have the general shape of a mouse with no tail.  There are also many fish species, which I am learning about, but they do not interest me as much as the other organisms.