Type of feed fish are divided into four groups:
– benthos feeders — fish, feeding on small organisms living on the bottom or near the bottom (benthos), sturgeon, grayling, bream, ruff, etc
– planktology — fish feeding on organisms living suspended in the water column (plankton), Zope, sabrefish, bleak, verhovka, etc.
– mixed feeding — fish feeding on organisms such as benthos and plankton, — roach, bream, IDE, Dace, etc.;
predators — fish that feed on other fishes or animals of their own species — pike, pikeperch, perch, Chub, burbot, catfish, trout, salmon of the Danube. Continue reading
It is the largest fish found in fresh waters, since in some cases it reaches a length of several meters and a weight of up to 1120 1280 even, and in the old days more than 1600 kg.
In addition to size, the Beluga is easily distinguished from all other sturgeon species by its thick cylindrical body and short pointed nose, which is somewhat transparent, since it is not covered by scutellum ivory; her mouth is huge, takes up the entire width of the head and is surrounded by a thick lip; the whiskers are distinguishable by their width and grab to his mouth. In addition, the bone on the head and scutellum bugs, especially lateral and ventral, appear to be relatively little developed: the dorsal is mostly 12-13, 40-45 lateral and ventral 10-12. General body color ash gray, the abdomen is grayish-white, yellowish nose.
Caspian and Black seas with rivers flowing into them, are almost the only stay of this giant fresh water, which, thus, is exclusively our heritage. Continue reading