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The oscar (Astronotus ocellatus) is a species of fish from the cichlid family known under a variety of common names, including tiger oscar, velvet cichlid, and marble cichlid. [2] In tropical South America, where the species naturally resides, A. ocellatus specimens are often found for sale as a food fish in the local markets.
Inbreeding in fish is the mating of closely related individuals, leading to an increase in homozygosity. Repeated inbreeding generally leads to morphological abnormalities and a reduction in fitness in the offspring. In the wild, fish have a number of ways to avoid inbreeding, both before and after copulation.
Tigerfish can refer to fish from various families, and derives from official and colloquial associations of these with the tiger (Panthera tigris).However, the primary species designated by the name "tigerfish" are African and belong to the family Alestidae.
Unlike its close relative Parachromis managuensis, P. motaguensis isn't as commonly encountered in the aquarium trade. Although their visual appearance is very similar, the motaguensis (traded by many names, including Red tiger, Red dragon cichlid) displays an array of bright red dots, (hence the variants of the common name), which run along the flanks to the base of the caudal fin.
The tigerfish is silver in colour when young, with thin black horizontal stripes and an elongated body that tapers at both ends. As the fish grows, it will develop a bronze coloration and the stripes will fade. The ventral and caudal fins have a slight red-orange tint, and the adipose fin is grey to black.
Hydrocynus vittatus, the African tigerfish, tiervis or ngwesh [3] is a predatory freshwater fish distributed throughout much of Africa. This fish is generally a piscivore but it has been observed leaping out of the water and catching barn swallows in flight. [4] [5]
The food-borne parasite Anisakis is a genus of nematodes known to be present in intermediate host salt-water fish, anadromous fish that travel from oceans to rivers to breed, and squid. [ 7 ] [ 18 ] Anisakis are directly infective to humans when infected fish or squid is consumed raw or slightly processed, causing a condition called anisakiasis .
Wild capture of breeding stock also has a negative effect on the global population because all the groupers caught in any size category are kept and grown until they reach market size. As ciguatera toxin is common in brown-marbled groupers' flesh, this limits fishing of this species in some geographic areas.