Swimming in large schools increases competition for meals, but it’s a price salmon pay to avoid becoming one themselves.
You don’t have to run faster than the bear; you just have to run faster than the guy next to you.shows that salmon in large groups are less likely to become shark bait.
Predators are less likely to ambush fishes living in larger groups. Predation risk halved with every 100 individuals added to the group. But grouping also comes at a cost. Larger schools meant greater competition for food. For chum and sockeye salmon, fish in larger schools also had emptier stomachs.
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