Electron transport system(ETS) activity as a possible index of respiration for larval walleye pollock Theragra chalcogramma.
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چکیده
منابع مشابه
Classification 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 کاملEffects of size and light on respiration and activity of walleye pollock (Theragra chalcogramma) larvae.
The respiration rate and swimming activity of walleye pollock (Theragra chalcogramma) larvae were measured in the laboratory to determine how these were affected by body size (measured as dry weight), and amount of light. Size influenced respiration rates, but not activity. Activity increased with increased light, and as walleye pollock larvae developed, light had an increasingly important effe...
متن کاملClimate change causing phase transitions of walleye pollock (Theragra chalcogramma) recruitment dynamics.
In 1976 the North Pacific climate shifted, resulting in an average increase of the water temperature. In the Gulf of Alaska the climate shift was followed (i.e. early 1980s) by a gradual but dramatic increase in the abundance of groundfish species that typically prey on pre-recruitment stages of walleye pollock. In the present study we used a previously parameterized model to investigate the ef...
متن کاملBiogeographic evidence for selection on mitochondrial DNA in North Pacific walleye pollock Theragra chalcogramma.
Three major mitochondrial DNA (mtDNA) haplogroups were identified in 5 data sets for North Pacific and Bering Sea walleye pollock. The common haplogroup A showed mirror-image clines on both sides of the North Pacific with high frequencies in southern areas (P(A) > 0.84) and low frequencies in the Bering Sea (P(A) < 0.36). Two additional haplogroups showed complimentary, but weaker, clines in th...
متن کاملComparing the modelled and measured target-strength variability of walleye pollock, Theragra chalcogramma
Many biological and physical factors potentially affect target strength. While these sources have been identified, few studies have compared the relative effects of individual factors. Modelled and measured target strengths in non-dimensional metrics were used to compare and rank the effects of fish length, tilt, depth, and acoustic frequency on backscatter intensity. Ex situ measurements of ta...
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ژورنال
عنوان ژورنال: NIPPON SUISAN GAKKAISHI
سال: 1990
ISSN: 1349-998X,0021-5392
DOI: 10.2331/suisan.56.1059