NOAA Technical Memorandum NMFS - AFSC - 37 A Bioenergetics Model of Walleye Pollock ( Theragra chalcogramma ) in the Eastern Bering Sea : Structure and Documentation
نویسندگان
چکیده
. . . . . . . . . . . . . . . Introduction . . . . . . . . . . . . . . The Bioenergetics Model . . . . . . . . . . .
منابع مشابه
A multispecies virtual population analysis of the eastern Bering Sea
The eastern Bering Sea shelf supports a large biomass of several groundfish populations, particularly walleye pollock (Theragra chalcogramma). The main trophic interactions between dominant groundfish populations in this region involve walleye pollock as prey. A multispecies virtual population analysis model (MSVPA) covering the period 1979–1995 has been parameterized for the eastern Bering Sea...
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The food habits of the flathead sole (Hippoglossoides elassodon) in the eastern Bering Sea were investigated. Our analysis of 4,406 flathead sole stomachs containing food showed that the diet was composed primarily of organisms living on the bottom (epibenthic) and pelagic organisms in close association with the bottom (nektobenthic). Feeding shifted from a crustacean-based diet to an ophiuroid...
متن کاملClassification of Ovarian Stages of Walleye Pollock (Theragra chalcogramma)
Walleye pollock, Theragra chalcogramma, is the most commercially important species in the eastern Bering Sea. Estimates of maturity are critical for setting an appropriate harvest rate for pollock spawning biomass, and correct classification of ovaries into a maturity condition is necessary for accurate estimation of maturity. Data on length, weight, and ovary weight and condition were collecte...
متن کاملComparisons of Walleye Pollock, Theragra chalcogramma, Harvest to Steller Sea Lion, Eumetopias jubatus, Abundance in the Bering Sea and Gulf of Alaska
Steller sea lion, Eumetipias jubatus, counts made on rookeries in the Gulf of Alaska, Aleutian Islands, and the Bering Sea from 1976 to 1991 were compared to annual estimates of walleye pollock, Theragra Chalcogramma, harvest to examine possible relationships between Steller sea lion abundance and commercial pollock fishing. Comparisons were made between Steller sea lion counts and pollock fish...
متن کاملSpatial and Temporal Variability in Size at Maturity of Walleye Pollock in the Eastern Bering Sea
—Size at maturity is incorporated into stock assessments of walleye pollock Theragra chalcogramma. For eastern Bering Sea walleye pollock, however, this important biological variable has not been examined since 1976 and possible interannual and geographic variations have never been evaluated. Maturity condition and fish length data were collected from 10,197 walleye pollock aboard factory trawl...
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