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But "selective fisheries" mostly harvest older fish, so the collective memory of routes is weakened. Younger fish are less confident, more likely to head the wrong direction. The result: a loss of collective memory & new spawning grounds that threaten to disrupt a stable equilibrium.
Herring spawned poleward following fishery-induced collective memory loss - NatureA critically low abundance of older herring due to age-selective fisheries resulted in an approximately 800-km poleward shift in main spawning.www.nature.com