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ICES Journal of Marine Science: Journal du Conseil 2001 58(1):61-69; doi:10.1006/jmsc.2000.0990
© 2001 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Influence of environment and fleet dynamics on catch rates of eastern Scotian Shelf cod through the early 1980s

D. M. Gillisa and K. T. Frankb

a Department of Zoology, University of Manitoba Winnipeg, MB, Canada, R3T 2N2
b Department of Fisheries and Oceans, Marine Fish Division, Bedford Institute of Oceanography Dartmouth, NS, Canada, B2Y 4A2

An analysis of the Atlantic cod (Gadus morhua) fishery on the eastern Scotian Shelf indicates that environmentally induced fluctuations in fish abundance or availability can influence catch rates beyond the immediate area of their impact through fleet dynamics. Each autumn, cod leave the Gulf of St. Lawrence and move on to the northeastern portion of the Scotian Shelf (Laurentian Slope). These movements, and the associated increases in catch rates, have been attributed to frontal concentrations of cod associated with the marginal ice zone. However, variation in catch rates on the eastern edge of the Scotian Shelf was correlated with variation on the central Scotian Shelf, beyond the extent of the marginal ice zone and the seasonal migration of fish from the Gulf. Changes in the distribution of fishing effort suggest that both fleet dynamics and the local availability of fish are important in determining realized catch rates. In light of fleet dynamics, differences in catch rates between the two regions of the Scotian Shelf suggest that the Laurentian Slope is a more costly region for fishing activities. Under these circumstances, trends in cpue will provide a poor indication of the distribution of fish between the two regions unless vessel distributions are also considered.

Keywords: ideal free distribution, catch rate, ice cover, fishing effort, fishing costs

Received 3 August 1999; accepted 24 June 2000.


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