Title: Scallop and clam abundance is affected by periodic dredging and trawling.

Background: Working from an observational report of a noticeable increase in the harvestable population of bivalves following seasons of dredging off the coast of New England, we plan to examine the potential mechanisms explaining such an increase. In the photo are 2 bushels of little necks and a bushell of large, very old quahogs whereas 4 years before there would have been about ten little necks in 30 bushells of large quahogs. The area had been closed for over 50 years due to pollution. WHere did they come from? Can periodic dredging and trawling stimulate the productivity and overall health of scallops, clams, and other mollusks and even burrowing worms? In addition, we will explore concepts that could be used for developing and justifying frameworks in other regions.

Thesis: Periodic dredging and trawling increases production of benthic organisms.

Importance: This research will provide a valuable analysis of the state of New England clam and scallop production and will help guide further research and policy toward maximizing output for these essential commercial species. If the hypothesis is supported, the sediment analysis and subsequent periodic dredging methods may be applied to other regions in which scallops and clams would benefit.

Approach: In situ study of scallop and clam spat and in-bottom organism development. Sediment analysis to look more closely at biofilms and silt that may develop in protected areas versus dredged and/or trawled areas. Simultaneously, test for 3 y-5 years (the grow out time of new settlement) the concept in selected areas having occasional or light production of the target species. Simultaneously (if funding is available) paired with an aquarium study to eliminate extraneous variables. Eventually expand beyond the North Atlantic to determine if conditions are similar elsewhere.

Other applications: Can this method be applied to other species, i.e., flounders that eat benthic organisms, for example, various worms, on or in the sea floor?

Contact Info: MaryOdum@evcarf.org

 

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