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In situ swimming characteristics of the sea scallop, Placopecten magellanicus, on German Bank, Gulf of Maine

Published online by Cambridge University Press:  25 April 2014

Gwyn E. Mason ,
Jessica A. Sameoto  and
Anna Metaxas
Gwyn E. Mason*
Affiliation:
Department of Oceanography, Dalhousie University, 1355 Oxford Street, PO Box 15000 Halifax, Nova Scotia, Canada B3H 4R2
Jessica A. Sameoto
Affiliation:
Bedford Institute of Oceanography, Department of Fisheries and Oceans Canada, 1 Challenger Drive, PO Box 1006, Dartmouth, Nova Scotia, Canada B2Y 4A2
Anna Metaxas
Affiliation:
Department of Oceanography, Dalhousie University, 1355 Oxford Street, PO Box 15000 Halifax, Nova Scotia, Canada B3H 4R2
*
Correspondence should be addressed to: G.E. Mason, Department of Oceanography, Dalhousie University, 1355 Oxford Street, PO Box 15000 Halifax, Nova Scotia, Canada B3H 4R2 email: gwyn.e.mason@gmail.com
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Abstract

Size distribution and swimming activity of the sea scallop, Placopecten magellanicus, were measured in situ from high-definition video recordings collected by a remotely operated vehicle on a fished scallop bed on German Bank, Gulf of Maine in August 2010. Scallop densities ranged from 0.004 to 3.89 m−2 and shell height (SH) ranged from 16.3 to 193.8 mm. The size distribution was bimodal, with high abundance from 20 to 40 mm SH indicating a recent recruitment event in the area. The low abundance of scallops >100 mm SH was likely due to the active fishery in this area. Of 535 observed swims, 200 were characterized for swim distance, time, velocity and distance travelled per adduction. The size of scallops observed to swim ranged from 18.9 to 99.9 mm SH. Both swim time and swim distance increased linearly with SH, and quadratic relationships were observed between velocity and SH, and between distance travelled per adduction and SH. Swimming velocities peaked at ~ 50 cm s−1 for scallops between 60 and 80 mm, and maximum velocity was 103.2 cm s−1observed for an individual of 64.0 mm SH. Our study provided a unique opportunity to investigate size distribution and associated swimming activity of scallops in their natural habitat, rather than in a simulated study in the laboratory, and at depths not reachable by SCUBA diving.

Keywords

Placopecten magellanicusscallopin situ swimmingGerman Bankremotely operated vehiclesize distributionscallop swimming
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 94 , Issue 5 , August 2014 , pp. 1019 - 1026
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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