Cohort analysis of the numbers by age-group of Atlantic cod caught off southern Labrador and eastern Newfoundland during 1961-80 were used, together with certain assumptions on inshore migration of cod and the seasonal nature of the offshore and inshore fisheries, to estimate rates of inshore exploitation of the stock during 1961-76. The results indicated that during 1961-74 only a small proportion (about 5%) of the cod, which survived the offshore fishery each year, were actually caught in the inshore fishery in the same year, although the proportions were higher in 1975 and 1976. Factors affecting the annual inshore migration of cod and the estimation of inshore exploitation rates are discussed.
Repetitive surveys of larval herring (Clupea harengus) were undertaken in coastal waters between Mt. Desert, Maine and Saint John, New Brunswick to define the location, timing, and extent of spawning and the distribution of larvae. Three surveys during September and October 1986 showed two separate areas of larval dispersal. The easternmost stations contained low densities of large larvae which were assumed to be part of the annually occurring larval aggregation off Nova Scotia. High densities of small larvae west of Grand Manan indicated that spawning in this area was confined to a small area southwest of Grand Manan and along the eastern Maine coast. This unique larval distribution confirms the autonomous nature of the eastern Maine–Grand Manan spawning group. Back calculation indicated hatching times between late July and the middle of October, but most of the larvae taken in the survey hatched in August and September. The larvae west of Grand Manan occurred within a well mixed water mass containing a characteristic neritic zooplankton community. Some larval herring remained near the spawning ground over a 2-mo period, while others dispersed west along the coast.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.