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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.
The Alosidae, or the shads, [2] [3] [4] are a family of clupeiform fishes. The family currently comprises four genera worldwide, and about 32 species. [5]The shads are pelagic (open water) schooling fish, of which many are anadromous or even landlocked.
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.
In the Hanafi school, one of the four Sunni schools, only "fish" (as opposed to all "sea game") are permissible, including eel, croaker and hagfish.. Any other sea (or water) creatures which are not fish, therefore, are also makruh tahrimi (forbidden but not as the same level as haram) whether they breathe oxygen from water through gills (such as prawns, lobsters and crabs, which are ...
The fish schools in coastal waters and ascends up the rivers (anadromous) for around 50 – 100 km to spawn during the southwest monsoons (June to September and January to April). Actual peak breeding season of the fish is a topic of debate amongst the researchers.
The schoolmaster snapper forms large resting schools during the day which disperse to forage at night, [2] these schools frequently sheltering in beds of sea grass. [5] These aggregations are defensive and are adopted by the fishes to minimise the chance of any one of them being predated.
Mackerel is a common name applied to a number of different species of pelagic fish, mostly from the family Scombridae.They are found in both temperate and tropical seas, mostly living along the coast or offshore in the oceanic environment.
Forage fish, also called prey fish or bait fish, are small pelagic fish that feed on planktons (i.e. planktivores) and other small aquatic organisms (e.g. krill). They are in turn preyed upon by various predators including larger fish, seabirds and marine mammals , this making them keystone species in their aquatic ecosystems .