The role of environmental conditions and exploitation in determining dynamics of redfish (Sebastes species) in the Northwest Atlantic

摘要: The six stocks of redfish (Sebastes spp.) in the Northwest Atlantic have been fished for past 60 years, during which time they also experienced considerable variability environmental conditions. Despite their close proximity and with life-history features characteristic many deep-sea fishes (long-lived, slow-growing, late-maturing, relatively low fecundity), each stock has displayed quite different dynamics. Some able to support apparently sustainable fisheries, whereas others forced close. causes such differences are unclear. We used dynamic factor analysis determine relative impacts exploitation (days fishing redfish, days shrimp, by all catch fishery, total catch) environment (North Oscillation, surface temperature, salinity, shallow, middle, deep bottom temperatures) on trends abundance over years 1960–2004. results showed that a mix variability, various lag times, accounted observed trends. Gulf St. Lawrence was affected most exploitation. Flemish Cap northern Newfoundland-Labrador were mostly factors longer lags than more southerly stocks. conclude management must take into account individual responses periods operate, often decades or more, as opposed usual practice reviewing only dynamics few years. Deep-sea populations cannot be managed same scales shelf fisheries.