The number of genetically distinct herring stocks is determined by the number of distinct, geographically stable larval retention areas. Spawning sites in these areas may be highly localized or dispersed. Absolute population size mostly depends on the retention area available to the density-dependent larval-postlarval stage. Although the extreme seasonal range of spawning time shown by Atlantic herring is not fully accounted for by a new hypothesis, current theory is not supported by the hypothesis or by empirical data. The management implications are discussed.
Sinclair, M., and 8. D. Iles. 1985. Atlantic herring (Clupea harengers) distributions in the Gusf of MaineScotian Shelf area in relation to oceanographic features. Can. I. Fish. Aquat. Sci. 42: 888-M7.There are clear, ternpsrally persistent patterns in the spatial distributions of AtBantic herring (Clupea Baarengus) at various life history stages. Three areas of potential importance for summer feeding and overwintering and one juvenile nursery area are described. In contrast, there are several well-defined spawning locations and larval distributional areas. The distributional patterns infer considerable betweenpopulation mixing at all phases s f the life history except at spawning time itself and during the first several months of the larval phase. The life history distributions are interpreted i n relation to tidally induced oceanographic features s f the area. The specific locations of spawning and the associated larval distributions are interpreted t o be a function of the location of physical features associated with "larval retention." The summer-feeding areas are associated with the location of tidally induced temperature fronts where plankton production is high. The larval distributional areas are argued t o be occupied i n spite of their particular plankton characteristics rather than because of them. The observed distributions are not consistent with some fisheries biology theories. Les repartitions spatiales des divers stades vitaux d u hareng de I'Atlantique (Clupea harengus) presentent des regimes distincts et ternporellement repetes. Le present rapport decrit trois zones potentiellernent importantes pour B'alimentation en ete et B'hivernage, et une zone d'alevinage. II existe par csntre plusieurs fray$res et aires d e repartitisn des Bawes bien definies. kes schemes de repartition indiquent ken important tm6tange entre ies populations a tous les stades d u cycle vital, sauf pendant la fraie et au cours des premiers mois de la phase lawaire. O n interprete la repartition des stades vitaux en fonction des caracteristiques oc6anographiques liees A la mar6e dans cette region. Ainsi, ('emplacement precis de la fraie et la repartition subsequente des lames sont perques comme fonction de l'emplacement des particularites physiques associ6es A la retention des Iarves. bes zones d'alimentation estivale correspondent a des fronts therrniques provoqu6s par la tmaree o h la production planctonique est elevee. O n soketient que tes zones de repartition des Iarves sont occupees rnalgre leurs caracteristiques particulieres pour ce qui est d u plancton et non a cause de celles-ci. hes repartitions obsewees ne sont pasen accord aveccertaines theories de I'halieutique.he first comprehensive study of Atlantic herring (Clupeka harengus) in Canadian waters was undertaken by the Norwegian pioneer of fisheries oceanography, Johm Hjort, and his co-workers during the Canadian Fisheries Expedition in 19 14-15. The aims of the expedition in general, and the hexing studies in particular, were to address "the problems which had...
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