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Schooling also has disadvantages, such as excretion buildup in the breathing media and oxygen and food depletion. The way the fish array in the school probably gives energy saving advantages, though this is controversial. [5] Schools of forage fish often accompany large predator fish. Here a school of jacks accompany a great barracuda.
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.
Garra barreimiae is a small, slender fish, somewhat flattened on the underside. It grows to a length of about 7–8 cm (2.8–3.1 in). [3] [4] The head is wedge-shaped and has a suction plate on the lower jaw and a blunt snout. This fish is a fairly dark colour and is speckled; it has a paler transverse band just behind the head.
Strategies such as those outlined in the previous section can work to a degree against freely streaming fish schools, but work much better if the fish school is first compacted into a bait ball. It is difficult for predators working individually to scare a fish school into a bait ball, and they usually work together.
The banded rainbowfish itself is exemplary of these traits; a hardy and peaceful shoaling fish, they make easy additions to most peaceful community aquariums and can tolerate a wide range of water parameters. Like many other rainbowfish, this species should be kept in an aquarium with a lid as they are capable of jumping out. [5]
Although it is a small fish, the White Cloud Mountain minnow is sometimes used as a pond fish, especially in ponds intended for frogs to breed. Adult White Cloud Mountain minnows will sometimes eat frog eggs as the tadpoles begin to move about or wait for them to hatch. Once tadpoles are a couple of days old they are out of danger.
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Atlantic herring can school in immense numbers. Radakov estimated herring schools in the North Atlantic can occupy up to 4.8 cubic kilometres with fish densities between 0.5 and 1.0 fish/cubic metre, equivalent to several million fish in one school. [7] Herring are amongst the most spectacular schoolers ("obligate schoolers" under older ...