Researchers from the University of Washington used 80 years of data to figure out how much warming fish could withstand. They discovered fish in the tropics are already living in water at the upper end of their threshold.

California State Parks scientists are running tests this week to determine what caused about 1,500 fish to die in Malibu Lagoon last week, but officials suspect higher-than-normal water temperatures may have played a role.

A year after tens of thousands of common murres, an abundant North Pacific seabird, starved and washed ashore on beaches from California to Alaska, researchers have pinned the cause to unusually warm ocean temperatures that affected the tiny fish they eat.

Opalescents, also known as market squid, are showing up in waters previously considered too cold for them, and fishermen are paying attention.