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Predators have devised various countermeasures to undermine the defensive shoaling and schooling manoeuvres of forage fish. The sailfish raises its sail to make it appear much larger so it can herd a school of fish or squid. Swordfish charge at high speed through forage fish schools, slashing with their swords to kill or stun prey. They then ...
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Small schooling fish are eaten by many types of predators, and for this reason they are called bait fish or forage fish. For example, sardines group together when they are threatened. This instinctual behaviour is a defence mechanism, as lone individuals are more likely to be eaten than an individual in a large group.
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The fish was caught October 23, 1977, in the Apalachicola River, Florida. This bass was a shoal bass, but originally reported as the Apalachicola form of redeye bass. Shoal bass are also popular targets for fly fishers , who find them easy to access in their preferred river environments.
Shoaling – describes the behaviour of fish which aggregate together, including mixed species groups. Fish derive many benefits from shoaling behaviour including defence against predators through better predator detection and by diluting the chance of capture, enhanced foraging success, and higher success in finding a mate.
Unlike many other shoaling fish, the fusilier damsels will not single out and focus aggression on the weakest individual. The fussiler damselfish is a social animal and does best when kept with others of the same species. A fast swimming fish that will readily eat most any foods offered.
Shoaling can also refract waves, so the waves change direction. For example, if waves pass over a sloping bank which is shallower at one end than the other, then the shoaling effect will result in the waves slowing more at the shallow end. Thus, the wave fronts will refract, changing direction like light passing through a prism.