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11-08-2010, 04:19 PM #1
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Predictability in a small commercial Atlantic salmon fishery in western Newfoundland
By E. Michael, P. Chadwick, Ross R. Claytor
Fisheries Research, Volume 10, Issues 1-2. Fisheries Research and the Atlantic Salmon - Assessment and Regulation in a Time of Change, December 1990, Pages 15-27, ISSN 0165-7836, DOI: 10.1016/0165-7836(90)90013-L.
This study examined the dynamics of a small Atlantic salmon (Salmo salar L.) stock in relation to its home water commercial fishery on the west coast of Newfoundland, 1981-1988. Catch rates in the fishery were estimated from daily logbooks. Counts of adults and smolts were taken at a counting fence in the river. Smolt migrations were used to predict stock abundance. Season and year effects of catch rates and run timing were compared between the fishery and the river using a multiplicative model. There was no significant annual variation in run timing for fishery or river, although the median date in the fishery occurred ~ 2 weeks earlier than in the river. Catchability in the fishery was constant over a 2-fold change in stock abundance. Standardized return rates of adults were a parabolic function of smolt abundance and were used to estimate optimum smolt yield for the river. The commercial fishery selected significantly larger salmon, leaving only small virgin grilse to spawn.