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GASCON, D., M. APARICIO, B. MERCILLE, 1990. Estimations du mélange entre les stocks de morue du Nord du golfe du Saint-Laurent (division 3Pn4RS) et les stocks adjacents (2J3KL, 3Ps et 4TVn (janvier-avril) à partir de résultats de marquage. CSCPCA doc. rech., 90/61, 25 p .
CASTONGUAY, M., B. MERCILLE, 1988. Le maquereau bleu (Scomber scombrus Linné) du nord-ouest de l'Atlantique, sous-régions 2 à 6 de l'OPANO : évaluation du stock en 1987. CSCPCA doc. rech., 88/50, 34 p .
MERCILLE, B., J. DAGENAIS, 1987. Revue de la biologie et de l'exploitation du lançon d'Amérique (Ammodytes americanus). Rapp. manus. can. sci. halieut. aquat., 1927, 49 p .
The authors reviewed the literature on the American sand lance (Ammodytes americanus). Several aspects concerning the biology and the exploitation of A. americanus are discussed. An annotated bibliography is also presented.
The history of the stock unit presently used for management of Northwest Atlantic mackerel is reviewed. Although two spawning populations were known to exist, the management area was defined on the basis of mixing of the two populations on overwintering grounds where most of the fishery was then occurring. The biological basis for the definition of the management unit is reviewed and shows that tagging data were the main factor in defining the management area. Recent genetic analyses do not suggest modifying the currently used management area.
GASCON, D., B. MERCILLE, 1986. Le maquereau (Scomber scombrus Linné) du nord-ouest de l'Atlantique, sous-régions 2 à 6 de l'OPANO. CSCPCA doc. rech., 86/92, 33 p .
Northwest Atlantic mackerel catches have averaged approximately 37 000 t since 1978. These catches are substantially below the 270 000 t average for the previous 10 years. Catches in 1985 greatly increased owing to the expansion of joint ventures between the United States and European countries. The nominal catch for 1985 was 68 000 t. Sequential population analysis (SPA) was run using a terminal fishing mortality of F=0.1. The partial recruitment vector was calculated using SVPA, but the fully recruited age was later lowered to 3 to account for the strong increase in catches by foreign fleets in the winter fishery of 1985. No tuning of SPA was attempted, because of the inadequacies of the abundance indices, and because SPA will not converge for recent years at low fishing mortalities. The level of fishing mortality chosen (F=0.1) is on line with values used in previous years, and population estimates obtained under this assumption agree well with the trends perceived in the abundance of mackerel. Under these assumptions, catch projections at F0.1 for mackerel are 245 000 t in 1986 and 202 000 t in 1987.
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