Simulation and assessment of the dynamics of American plaice stocks in the Gulf of St. Lawrence (4T) / J. Schweigert.: Fs70-8/78-14E-PDF

"The fishery for the Gulf of St. Lawrence (4T) American plaice (Hippoglossoides platessoides F.) increased substantially in the early 1950's with the advent of otter trawling which increased the effort through the 1960's declining slightly thereafter. Simultaneously, the fishing effort by Danish seiners has increased steadily from the late 1950's through the present. The total landings have fluctuated around the present (1977) quota of 10,000 MT over the same period (Fig. 1). The present work represents the first comprehensive assessment of the stock since the initial study by Powles (1964, 1965, 1969). A major concern of this earlier study and others (Powles 1969, Jean, 1963) was the discarding of small plaice taken as bycatches in the preferred cod fishery. The magnitude of this wastage (25 - 50 % by weight) was felt to be a cause for concern relative to longterm yield to the fishery. The present work incorporates information collected on contract by MacLaren Atlantic Ltd. (MS 1976) on discarding into a model of the stock dynamics. The effects of various rates of exploitation on the dynamics of the plaice stock were then simulated to determine the optimal management strategy for maximum longterm stability and yield to the fishery"--Introduction.

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