Sea surface temperatures in Gulf of Alaska found to be less favorable for cod. pollock

摘要

N'OAA Fisheries scientists have developed a new nodeling approach to evaluate changing fish population productivity in light of warming ocean temperatures. Fish stock productivity is deterinined by estimating the number of fish that survive from eggsand larvae to become adults annually.Scientists used the approach to evaluate productivity for two important commercial fish stocks in the Gulf of Alaska. Tliey found that for pollock and, especially. Pacific cod, sea surface tempera-tui-es in the Gulf of Alaska are already less conducive to successful fish development, growth, and survival than in recent decades.