The flora and fauna of the Black sea is quite diverse, although in recent years, in connection with the anthropogenic activity and has undergone significant changes in its composition and strength. For the most part, the denizens are a species brought from the Mediterranean, here there are even a few relict species. Living organisms can be found at depths up to 150 metres, before the beginning of the hydrogen sulphide layer, which also determines the relative poverty of the animal world, compared to the Mediterranean sea.
Algae of the Black sea includes 270 species of multicellular benthic algae and 600 species of phytoplankton. The most common types are villaflora, kladofora, cistozira, Ulva, Zostera. In the summer the most active development escobilla and ceratium. Common diatoms.
The fauna is even more diverse, it includes more than 2500 species of animals, most of which were unicellular and crustaceans – about 500 species. In second place – shellfish, about 200 species, and only fish 160 species. The rest of the mass consists of numerous species of invertebrate animals. Continue reading
There are about 1200 species of catfishes that are divided into 31 families and 150 genera. Typical external characteristics, distribution, conditions of keeping and feeding of catfish, will be discussed in the article.
Under the name “catfish” joins more than 1200 species of whiskered fish that is distributed into 31 families and 150 genera. Most of them are found in freshwater reservoirs 5 continents, and only 1% of their number are marine inhabitants. Only in the rivers and lakes of South America is home to about 1000 species of catfish.
Representatives of catfishes are very similar in body structure with Cypriniformes. The body of aquarium fish catfish often covered with bony plates, or protected by spikes. However, aquarium fish catfish no scales present, their body is considered naked. Around the mouth there are several pairs of whiskers. Continue reading