Lobster Bulletin


    In This Edition

  1. Lobster Industry to Hold Own Convention

  2. Lobster Research Faces Problems

  3. Yet Another Disease

  4. Proposed Study Could Help Forecast Trends

  5. Choose Another Bulletin



Lobster Industry to Hold Own Convention

On October 29-31, 1993, lobster industry members from Newfoundland to New Jersey will meet in Portland, Maine for the International Lobster Industry Congress and Trade Show. Billed as "a grand gathering of the clan," the event is being organized by a steering committee of harvesters, dealers, pound owners, industry suppliers, promoters, and scientists from throughout the North Atlantic region.

For many years, the lobster industry has recognized the need for a lobster specific conference. With a growing worldwide seafood market and increasing competition, sophisticated telecommunications systems, resource management and conservation concerns, and environmental issues, it is now more important than ever for lobster industry members on both sides of the border to talk to each other, share information, try to understand each others problems, work together for common solutions, and forge new opportunities for the entire North Atlantic lobster industry.

Although the steering committee will be responsible for the final agenda of the the Congress, the event will be modelled after the Maine Fishermen's Forum with educational seminars, industry association meetings, and scientific workshops. Invited presentations could include speakers from the Scottish lobster industry or the Australian fishery, and from the retailer/restaurant sector such as Red Lobster and the Winn Dixie supermarket chain.

Besides the educational components of the Congress, there will also be a trade show focusing exclusively on lobster gear. Other preliminary plans include a "red tie" lobster formal banquet (and ball) where industry awards and youth scholarsips will be presented, a chef's lobster cooking competition, children's activities, and shopping/sightseeing tours.

Portland was chosen for the Congress because it is centrally located, easily accessible by air and ferry services, has a block of hotels and a civic center all within walking distance, many great restaurants, and lots to do.

Ed Blackmore, chairman of the University of Maine's Lobster Institute board of advisors, is heading up the effort to plan the event with support from Belinda Doliber, coordinator of the Maine Fishermen's Forum since 1990.

The First International Lobster Industry Congress and Trade Show promises to be a real extravaganza. Mark the date on your calendar now!

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Lobster Research Faces Problems

One of the biggest problems researchers face in trying to find cures for shell disease and ciliated protozoans is their inability to infect lobsters with these diseases. After lobsters have the disease, then researchers can conduct controlled experiments to find potential cures. Last summer Deanna Prince, a graduate student in Animal, Veterinary, and Aquatic Sciences at the University of Maine (UM), used sandpaper to remove the outer layer (epicuticle) of lobster shells. This technique should have allowed disease-causing bacteria to enter the shell. However, immediately after the shells were sanded, the lobster produced a dark brown melanin substance which covered the wound and prevented bacteria from entering the shell and infecting the lobster.

Mike Loughlin, another graduate student at UM, has been infecting lobsters with ciliated protozoans. After the lobster has been injected with the disease-causing organisms, it takes three weeks to three months for the animal to exhibit the disease. Since the disease is difficult to transmit artificially, researchers will continue to search for the conditions in nature that allow the disease to be transmitted from one lobster to another.

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Yet Another Disease

Researchers have recently found a pathogenic Vibrio bacterium in several pounds in Canada and cars in Maine that also causes disease in lobsters.

However, UM scientists discovered that Vibrio can be controlled by Terramycin, an antibiotic found in medicated feed. Therefore, lobsters in pounds that are fed a medicated diet do not seem to contract the disease.

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Proposed Study Could Help Forecast Trends

In 1991, the lobster harvest in New England was the largest in over a century. Canada has also experienced a similar increase in landings since the late 1970s. All evidence suggests that there has been a real and significant increase in lobster populations along the entire coast.

Although this picture looks very optimistic, fisheries managers are concerned because population models did not predict the increase in harvests. The trend may have already started to reverse, with the catch in Maine down 10 per cent for the first six months of 1992, and no one understands the factors that lead to increases or declines in abundance. Sound fishery management depends on having reliable tools to forecast trends in fished stocks. Currently, there is no good forecasting tool for the American lobster.

Lew Incze of Maine's Bigelow Laboratory for Ocean Sciences, Rick Wahle of Brown University in Rhode Island, and Stan Cobb of the University of Rhode Island are requesting Sea Grant funds for a six-year study to assess the relationships between the supply of postlarval lobsters (PLs-when lobsters can still swim but are soon capable of settling on the bottom); how many successfully settle on the bottom (recruit), become early benthic phase (EBP) lobsters and grow to two years old; and the number landed by the fishery. This information could help explain factors that lead to increases and declines in populations, and, if a relationship is found between PLs, EBPs, and fishery landings, it could also be used to forecast trends in the fishery.

Data relating postlarval abundance to EBP recruits has already been collected for three years in Rhode Island and four years in Maine. If researchers receive funding for their six-year study, they will have data for 10 years that could potentially be used to forecast lobster population trends in two environmentally distinct regions. Although Rhode Island and Maine have different temperatures and coastal geology, both have large lobster populations and productive lobster fisheries.

Researchers will sample postlarval and EBP lobsters in John's Bay in the Boothbay Harbor region of Maine, and at Point Judith in Block Island Sound in Rhode Island - the same locales where previous data was collected. By expanding their study to a regional scale and extending it over a longer time period, scientists will gain an understanding of local and regional differences in larval supply, benthic recruitment, and the fate of EBP lobsters during the first two years of life. Over the long-term, they will determine how useful this sampling effort is in predicting trends in harvest levels or other characteristics of the fishery.

Plankton will be sampled using neuston nets at 10 sites in Rhode Island and 12 in Maine. Tows will be made bi-weekly in Rhode Island over a ten-week sampling period, and weekly in Maine for six weeks. Each tow samples 500 square meters of sea surface. Samples will be presorted at sea, stored in the dark on ice, and analyzed at the respective labs on land. Standard climatological and sea surface observations will be made including wind direction and speed, wave direction and height, cloud cover, current direction, and sea surface temperature.

Censuses of EBP lobsters on naturally occurring cobble bottom and standardized cobble plots (to eliminate habitat differences as a possible explanation of differences in recruitment among sites) will be done using a diver-operated suction sampler. Lobsters will be counted, measured, and their growth monitored over a two-year period. Researchers will then examine the relationships between the abundance of postlarval lobsters at various locations and times in the two states, and the number that recruit to the bottom.

Specific questions that will be addressed are:

* Are yearly fluctuations in PL abundance or production reflected in the landings 5 to 7 years later?

* Are PL abundance and early benthic recruitment significantly related, and under what conditions?

* Are yearly fluctuations in benthic recruitment reflected in the landings several years later?

The research team plans to collaborate with fisheries management agencies to analyze landing statistics. If they find significant relationships between early life patterns of lobsters and fishery yields, researchers will help develop a long-term monitoring plan that states could use as a management tool. They will also help train appropriate state personnel in using their sampling methods.

If this long-range study is funded, it could have far-reaching implications for future lobster management. Researchers should find out in October whether their project will be approved for a 1993-94 Sea Grant award.

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The Lobster Bulletin is a periodic newsletter published by the Lobster Institute in cooperation with the Maine/New Hampshire Sea Grant Marine Advisory Program. We welcome your comments and suggestions. For more information please contact us at:
Lobster Institute
5715 Coburn Hall #22
University of Maine, Orono, ME 04469-5715
TEL (207) 581-1448. Editor: Susan White.



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