North American catfish thronging fishes of the Kuban
North American catfish, introduced 30 years ago in Krasnodar region, thronging fish-natives, including our native European catfish. American channel catfish was brought in a fish farm of the Krasnodar territory…

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The basking SHARK (Cetorhinus maximus)
There is evidence that specimens of up to 15 metres in length, however, evidence of the existence of such giants among scientists yet. At the same time, instances caught a…

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Nitrogen metabolism in the aquarium
Nitrogen metabolism in the aquarium: (1) Forage (2) NH 3 . (3) NO 2 . (4) NO 3 . (5) H 2 O. (6) Lighting, (7) Fertilizer (8) O 2…

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Black tuna (Thunnus atlanticus)

Black tuna is a small predatory fish in the scombridae family. Has the smallest size among all species of tuna: a maximum of 100 cm in length (average 50 cm) and up to 21 kg (average 3 kg).

The habitat of the black tuna is a very limited range of marine areas that are not characteristic for other members of the genus. It is found only in the Western Atlantic, from Massachusetts in the North to Rio de Janeiro in the South, mainly near the surface, where the water is warm and clean.

The upper body of the black tuna has colors from bluish-gray to black, sides silvery, belly white. Also on the sides sometimes you can see Golden-yellow stripe with indistinct borders, quite wide at the head and tapering towards the tail. Behind the second dorsal fin on top and anal fin from the bottom there are small protrusions that extend to the tail. In form the fish body like an oval, which, coupled with the Crescent tail allows it to develop in the water with serious velocity.Adult tuna

During the breeding season in different parts of the area occurs from April to November. Sperm and eggs are produced by tuna in water, where the process of fertilization. After that, the black tuna fry live an independent life, drifting in the water column at the depth of 50 meters. It is known that fry grow very quickly, to two years reaching sexual maturity, and age five fish is already considered old.Malek black tuna

Black tuna feeds on various fish, squid, shrimps, crabs and amphipods, which he easily catches, due to high speed swimming. But in turn, the predator is prey for other ocean fish, among which is the blue Marlin, big Dolphin fish and striped tuna, which is a relative of the black. In addition to predators, the importance of the black tuna has for humans, as it is considered a valuable commercial fish, is also a desired trophy in sport fishing.Desirable prey of the black tuna

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MARBLED ELECTRIC ray (Torpedo marmorata)
MARBLED ELECTRIC ray (Torpedo marmorata), or marble torpedo is the best known representative of a numerous family glusovich. In length this fish rarely reaches 1.5 meters, the width grows more…

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JELLYFISH OF THE BLACK SEA
Surely You in his life met in a sea of jellyfish. They are small, and there are also very large, also they are all different colors, there are white, red,…

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