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If the shoal becomes more tightly organised, with the fish synchronising their swimming so they all move at the same speed and in the same direction, then the fish may be said to be schooling. [1] [3] [b] Schooling fish are usually of the same species and the same age/size. Fish schools move with the individual members precisely spaced from ...
A bait ball, or baitball, occurs when small fish swarm in a tightly packed spherical formation about a common centre. [1] It is a last-ditch defensive measure adopted by small schooling fish when they are threatened by predators. Small schooling fish are eaten by many types of predators, and for this reason they are called bait fish or forage fish.
As the group circles a school of small fish such as salmon, krill, or herring, they use a team effort to disorient and corral the fish into a "net" of bubbles. [4] One whale will typically begin to exhale out of their blowhole at the school of fish to begin the process. [4] More whales will then blow bubbles while continuing to circle their prey.
Billfish normally use their bills to slash at schooling fish. They swim through the fish school at high speed, slashing left and right, and then circle back to eat the fish they stunned. Adult swordfish have no teeth, and other billfish have only small file-like teeth. They swallow their catch whole, head-first.
The whirligig beetles are water beetles, comprising the family Gyrinidae, that usually swim on the surface of the water if undisturbed, though they swim underwater when threatened. They get their common name from their habit of swimming rapidly in circles when alarmed, and are also notable for their divided eyes which are believed to enable ...
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A single dolphin will swim in a circle around a group of fish, swiftly moving his tail along the sand to create a plume. [2] This creates a temporary net around the fish and they become disoriented. The fish begin jumping above the surface, so the dolphins can lunge through the plume and catch the fish.
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