The Number – Cypriniformes
Family – Priniv
The genus/Species – Serrasalmus nattereri
Length: average 20 cm, in some species up to 50 cm.
Mass rarely exceeding 1.5 kg.
Caviar: a few thousand eggs.
The incubation period is 10-15 days, depending on water temperature.
Habits: constant float huge flocks.
Food: primarily fish; attack mammals, floating or come to the waterhole, and birds.
18 known species of piranhas, 4 of which are dangerous to humans, although fatal cases have been identified. Continue reading
Most fish lay eggs, and it is fertilized outside of their body. Fish that spawn, are called oviparous. But some fish give birth to live fry. Such fish are called viviparous.
To live-bearing are guppies, sword fish. The eggs of these fish are fertilized inside the mother’s body and develop there until the fry. At a certain time they are born. This happens 21 days after fertilization.
The number of eggs, fertilized and deferred, differs greatly depending on the type of fish. Some fish lay eggs and abandon her, without showing her any more interest. This is a fish that produce huge amounts of eggs. Those fish that look after their young, they lay only a few eggs.
Caviar can be of two types. One kind of eggs floats on the water surface, the other sinking. The caviar, which floats, is called pelagic. It is usually tiny, bright and contains a lot of protein. Caviar, which is sinking, is called Donna. It is usually harder and more protein in it. Continue reading
Katran – black (Squalus acanthias ponticus)
Reaches a body length of 2 m (usually 1.5 m). Found only in the Black sea waters to depths of 60 m.
Attention. All kinds of old-fashioned recourses are at the base of the dorsal fin spines small venom glands. When you shot the venom and mucus enter the blood stream and cause local poisoning, often accompanied by severe pain and inflammation.
The naked body is olive-brown above and whitish below. Leads benthic lifestyle, often buries itself in mud and sand. The predator, eats fish. Viviparous species. Body length is more than 1.8 m, weight about 20 kg. In our waters common in coastal areas of the Black and the southern part of the Azov sea common to the coast of Europe to England. The stingrays are very dangerous in water and outside of it (caught the bait, etc.) because they can cause serious injury to the poisoned needle. Known cases ended disability and even death of victims. Continue reading