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Bibliography of the Maurice Lamontagne Institute

Daniel THIBEAULT

GRÉGOIRE, F., D. D'AMOURS, C. LÉVESQUE, D. THIBEAULT, 1995. Estimation de la biomasse reproductrice du stock de maquereau (Scomber scombrus L.) du golfe du Saint-Laurent pour 1994 ; Estimation of the Gulf of St. Lawrence spawning stock biomass of mackerel (Scomber scombrus L.) for 1994. MPO, Pêches de l'Atlantique, Document de recherche ; DFO, Atlantic Fisheries, Research Document, 95/118, 81 p .

The spawning biomass of mackerel, which spawn in the Gulf of St. Lawrence, was estimated at 800,676 t in 1994. This figure is slightly higher than the 1993 and 1992 estimates of 775,716 t and 791,953 t respectively. Egg samples taken with a pump were used to calculate a rate constant k of 0.17; this estimate was utilized in an exponential model to describe the vertical distribution of eggs. Until this point, a rate constant k of 0.15, extracted from the literature, had been used in a model to correct for the oversampling of eggs that occurs at the end of each tow. No relationship was observed between wind speed and k. This may be due to the small number of stations sampled and the response time of the water mass to changes in wind speed during sampling.