Vertical Distribution of Age-0 Walleye Pollock during Late Summer: Environment or Ontogeny?
نویسندگان
چکیده
منابع مشابه
Update of Navarin walleye pollock stock assessment
Stock assessment model was so called effort-controlled version of the ISVPA-group of separable cohort models (for details of the model see appendix and references to it). This version of the model attributes residuals in cohort part of the model to errors in catch-at-age data, assuming that selection pattern (patterns) is stable. This version is often more robust for noisy catch-at-age data. Ad...
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Variability in echo intensities from aquatic organisms is caused by physical factors associated with the transmission of sound through water, and by biological factors associated with the ontogeny, physiology, and behaviour of targets. Acoustic-based density estimates depend on accurately characterizing reflected or backscattered sound from any species of interest. Digitized lateral and dorsal ...
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The waters around the Pribilof Islands in the southeast Bering Sea are a center of abundance for age-0 walleye pollock (Theragra chalcogramma). Each spring and summer a tidal front is formed around the islands separating a well-mixed inshore habitat from a stratified offshore habitat. The objective of this study was to assess the foraging impact on zooplankton by age-0 pollock in the vicinity o...
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 کاملRegional, interannual and size-related variation of age 0 year walleye pollock whole body energy content around the Pribilof Islands, Bering Sea
Mean whole energy content (Ewb) of age 0 year walleye pollock Theragra chalcogramma was 19·928 KJ g 1 dry mass in 3943 fish collected from different habitats around the Pribilof Islands frontal structure, south-east Bering Sea, during September 1994–1996 and 1999. It varied, however, with habitat type. Fish residing offshore had higher Ewb than fish residing inshore of the frontal regions. Age ...
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ژورنال
عنوان ژورنال: Marine and Coastal Fisheries
سال: 2015
ISSN: 1942-5120
DOI: 10.1080/19425120.2015.1057307