Some environmental factors that influence the growth of Arcto-Norwegian cod from the early juvenile to the adult stage
2000
A high growth rate for Arcto-Norwegian cod (Gadus morhua L.) in the Barents Sea andadjacent areas from the larval stage to the 0-group stage enhances survival and ultimatelyrecruitment to the fishery. However, it appears that relatively high growth rates for acohort through the 0-group stage are not continued as the cohort ages. Based on surveydata, there is a negative, though not significant, correlation between a cohort’s averagelength at the 0-group stage and its average length as 1 year olds and a significant negativecorrelation between the average length at the 0-group stage and its average length at ages2 through 9. It appears that the reason for this slowing of growth is that a strong inflow ofwarm, prey-rich Atlantic water into the Barents Sea from the Norwegian Sea providesfavorable conditions for growth a”nl’d hence survival of the cod larvae and juveniles. Butthis same strong inflow cakes a proportion of the cohort farther to the east in the BarentsSea, where the bottom water is colder than in the west. Thus the young settled codexperience colder conditions, which slows their growth, than those cohorts that have amore westerly settlement, and this slow growth before age 2 appears to be the reason forthe cohort’s relatively smaller mean length at older ages.
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