Depletion? or Migration. Sardine disappearance was foreseen but ignored

Pacific sardine populations fluctuate with water temperature. Colder water means fewer fish. Temperatures last fell in the 1940s, but heavy fishing continued, devastating the stock and ending fishing until sardines returned when waters warmed in the 1980s. more@newscientist  18:51 (Am I missing something? ) scratches head.

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