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SINCLAIR, M., M. CHADWICK, D. CLAY, G. CHOUINARD, D. D'AMOURS, A. FRÉCHET, D. GASCON, P. HUDSON, E. LABERGE, T. LAMBERT, B. RANDALL, J. RUNGE, R. TALLMAN, 1991. Report on the Workshop on Fish. Pages 31-45 in J.-C. Therriault (ed.). The Gulf of St. Lawrence : small ocean or big estuary ? Dept. of Fisheries and Oceans (Can. Spec. Publ. Fish. Aquat. Sci., 113) .
SINCLAIR, M., M. CHADWICK, D. CLAY, G. CHOUINARD, D. D'AMOURS, A. FRÉCHET, D. GASCON, P. HUDSON, E. LABERGE, T. LAMBERT, B. RANDALL, J. RUNGE, R. TALLMAN, 1991. Rapport de l'atelier de travail sur les poissons. Pages 31-45 in J.-C. Therriault (éd.). Le golfe du Saint-Laurent : petit océan ou grand estuaire? Ministère des pêches et des océans (Publ. spéc. can. sci. halieut. aquat., 113) .
FRÉCHET, A., E. LABERGE, 1990. New strata for groundfish surveys in the Gulf of St. Lawrence, NAFO divisions 4RST. NAFO SCR Doc., 90/45, 2 p .
McLAREN, I.A., E. LABERGE, C.J. CORKETT, J.-M. SÉVIGNY, 1989. Life cycles of four species of Pseudocalanus in Nova Scotia. Can. J. Zool., 67: 552-558 .
The primarily arctic Pseudocalanus acuspes, relict in Bedford Basin, Nova Scotia, produces a first generation (G1) in late winter; most G1 individuals mature in late spring. The G1 then produces a G2, most of which "rest" in copepodite stages III and IV until early winter. These stages store large amounts of lipid in early summer, which slowly diminish subsequently. A small number of G2 individuals continue to develop at temperature-dependent rates, maturing in early autumn and producing G3 adults in November. Copepodites developing in winter and spring store less lipid. The primarily arctic Pseudocalanus minutus, rare in Bedford Basin and on the Scotia Shelf, is strictly annual, developing to a lipid-filled copepodite stage V after spawning in late winter. The arctictemperate Pseudocalanus newmani is abundant on the Scotian Shelf, but may not be self-sustaining when advected into Bedford Basin. It stores little lipid and appears to have at least three mature generations at temperature-dependent intervals over Browns Bank between May and November. It may rest in winter, or its life-cycle synchrony by spring could result from food-limited development during winter. The temperate Pseudocalanus moultoni appears to have a life cycle similar to that of P. newmani, but was less common during summer on Browns Bank. These life cycles are appropriately adapted to the geographical ranges of the species, and show some parallels with species of Calanus.©1989 National Research Council Canada
LABERGE, E., S. HURTUBISE, 1989. Évaluation du stock de sébaste (Sebastes spp.) des divisions 4RST de l'OPANO. CSCPCA doc. rech., 89/50, 47 p .
LABERGE, E., 1988. Assessment of divisions 4RST redfish (Sebastes spp.). CAFSAC Res. Doc., 88/44, 44 p .
Reported landings for the NAFO Divisions 4RST redfish fishery in 1986 were estimated at 33,107 t. Although they constitute a 5,000 t increase from last year, they still represent only 60 % of the TAC. Catch rates for bottom trawls (excluding Engels high-lift), Engels high-lift trawls and midwater trawls were analyzed separately using a multiplicative model. The catch rate series shows 2 distinct peaks, one in 1967-1968 (1.33 t/h) and the other in 1981-1982 (1.29 t/h) and have declined since then; the decline appears to have stopped in 1986. Length frequency distributions based on commercial sampling and research survey data show the presence of 2 strong year-classes : one from the early 1970's (fish about 30 cm) and one from the early 1980's (fish about 20 cm). These smaller fish should be recruiting to the fishery in the next few years. The current biomass (beginning of 1987) was estimated from a non-linear version of the Schaefer general production model to be 473,000 t. Because of uncertainties with regard to the changes in availability of fish to the gear, and therefore the effort levels implied, the recommended catch for 1988 were set at the 2/3fmey equilibrium yield of 56,000 t.
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