Multiple genetic stocks of longfin squidLoligo pealeiiin the NW Atlantic: stocks segregate inshore in summer, but aggregate offshore in winter

The longfin squidLoligo pealeiiis distributed widely in the NW Atlantic and is the target of a major fishery. A previous electrophoretic study ofL. pealeiiwas unable to prove genetic differentiation, and the fishery has been managed as a single unit stock. We tested for population structure using 5...

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Bibliographic Details
Published in:Marine ecology. Progress series (Halstenbek) 2006-04, Vol.310, p.263-270
Main Authors: Buresch, K. C., Gerlach, G., Hanlon, R. T.
Format: Article
Language:English
Subjects:
Alleles
Canyons
DNA
Evolutionary genetics
Fisheries management
Genetic loci
Genetic variation
Microsatellites
Population genetics
Squid
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Summary:The longfin squidLoligo pealeiiis distributed widely in the NW Atlantic and is the target of a major fishery. A previous electrophoretic study ofL. pealeiiwas unable to prove genetic differentiation, and the fishery has been managed as a single unit stock. We tested for population structure using 5 microsatellite loci. In early summer (June), when the squids had migrated inshore to spawn, we distinguished 4 genetically distinct stocks between Delaware and Cape Cod (ca. 490 km); a 5th genetic stock occurred in Nova Scotia and a 6th in the northern Gulf of Mexico. One of the summer inshore stocks did not show genetic differentiation from 2 of the winter offshore populations. We suggest that squids from summer locations overwinter in offshore canyons and that winter offshore fishing may affect multiple stocks of the inshore fishery. In spring, squids may segregate by genetic stock as they undertake their inshore migration, indicating an underlying mechanism of subpopulation recognition.
ISSN:0171-8630
1616-1599