Abstract
This study uses survey and tagging data and cluster analysis to interpret dynamics of ontogenetic movements and seasonal migrations in snow crab (Chionoecetes opilio) along the Newfoundland and Labrador (NL) continental shelves. Most historic literature from Atlantic Canada suggests snow crab undertake small-scale ontogenetic movements while observations of seasonal migrations had been near-exclusive to the inshore. Information on both types of movement in the most spatially expansive offshore region of Atlantic Canada, in NL, was lacking. We find that that both ontogenetic movements and seasonal migrations occur in most areas of the NL offshore, with ontogenetic movements generally down-slope and seasonal migrations generally up-slope. Conservative estimates of average ontogenetic movements range from 54 to 72 km for both males and females in the largest offshore regions while seasonal migrations are slightly smaller, with two independent studies on the Grand Bank producing average estimates of 43–46 km and an adjacent tagging study in a smaller inshore bay producing an average estimate of 25 km. Ontogenetic movements appear associated with a search for warm water while seasonal migrations appear associated with both mating and molting in shallow water. On average, morphometrically mature crab of both sexes move less vertical distance than morphometrically immature crab during seasonal migrations. We investigate plausible explanations for ontogenetic movements and spring migrations and detail how bottom temperature affects crab distribution and life history dynamics. We further document movement patterns from tagging studies on the burgeoning snow crab stock in the Eastern Barents Sea toward establishing consistencies in species behaviour on the global scale. Finally, we discuss explanations for historical disparities in the literature between scales of movement for snow crab in the Eastern Bering Sea of Alaska versus Atlantic Canada and advance perspectives on life history theory for the species.
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Mullowney, D., Morris, C., Dawe, E. et al. Dynamics of snow crab (Chionoecetes opilio) movement and migration along the Newfoundland and Labrador and Eastern Barents Sea continental shelves. Rev Fish Biol Fisheries 28, 435–459 (2018). https://doi.org/10.1007/s11160-017-9513-y
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DOI: https://doi.org/10.1007/s11160-017-9513-y