The fish fauna of the Black sea is peculiar. The class of fishes that includes about 20 000 species, is divided into two sharply distinct branches — the cartilaginous and bony fish. In the Black sea are mainly of bony fish and only four cartilaginous family: cat sharks, prickly sharks, common stingrays and stingrays. Out of 167 species of sea fish of 37 species is primarily freshwater, 27 – 103 and brackish – marine. A significant part of the primary freshwater species that live in coastal lakes and river estuaries, can tolerate some salinization of water. Many of them (several species of herring, almost all servie fish, etc.) are semi-migratory and passage species, and some species are fully adapted to marine conditions of life.
Most of the group of brackish-water fishes of marine origin can withstand large desalination, and others (several species of gobies, etc.) live in fresh water. It is autochthonous relict species characteristic of the Ponto-Caspian basin. Their origin is connected with seas that filled the black sea geosyncline during the Neogene. In the third group — marine fish — can distinguish Continue reading
17 more than 650 new species of marine life discovered by scientists during the international project “Census of marine life” . In different corners of our planet with the help of automatic cameras, sonar and other equipment of deep-sea biologists from 80 countries explored the seabed down to depths of 1 to 5 km, to where “reign of eternal twilight.” Oil worms, crabs with furry claws, completely transparent sea cucumbers with tentacles-spikes – this is not a complete list of detected living beings. But, according to the scientists themselves, it is at the bottom of the Central part of the Atlantic ocean . in the vicinity of the Easter Islands and New Zealand made the most specific opening.
Gelatinous octopus nicknamed Dumbo thanks to a pair of fins funny forms that look like the ears of the disney character of the same name. It weighs 6 kg with a body length of about 2 meters and lives at a depth of 3,000 meters. Continue reading