The white sea is relatively warm, but due to the distance from the ocean the diversity of its flora and fauna is markedly inferior to its neighbor to the North is the Barents sea, with which it is connected by the Straits of the Throat. White sea water area is formed by several bays and lips, each with its own name.
A large number of rivers flowing into the White sea (Onega, Kem', Severnaya Dvina, Mezen, full, etc.), contributes to the freshening of the upper water layer compared to the deep sea. But due to the fact that in the Central part of the sea is a deep basin (over 300 m), surrounded by small depths from the Barents sea (80 m), deep water not affected by water exchange, which occurs between the seas-the neighbours twice a day, and retain its saltiness. Due to this, in the lower layers stored in huge stocks of bottom animals zooplankton.
In the White sea is about 68 species of fish, 56 of them are marine, the remaining anadromous or catadromous. They live mostly at depth of 20-30 m, where a lot of food. When the temperature of the upper layers reaches +150C, in the white sea water passing the Norwegian and Barents sea, on the feeding and spawning of the Atlantic comes a lot of heat-loving fish: salmon, Northern cod, haddock, and cod. They are also migrating mackerel, plaice, Atlantic herring, catfish common (similar to white sea catfish striped), brown trout. Frequenters of shallow water are: pinagor, gerbil, maslaki and baldyga, gobies, skorpena, Klyuchi, carcaci, capelin, sea perch, whitefish and smelt.
Pacific herring was one of the first commercial fish species. Polar cod and navaga come in the White sea in winter to spawn, which makes for the Barents sea. Smelt is a catadromous fish that spawns and overwinters in rivers. Whitefish is a valuable commercial fish is found everywhere near the sea shore and in the estuaries of rivers. Catfish, cod and haddock demersal marine fish, avoiding desalination.
Polar cod, saithe and cod – cod representatives – also winter in marine waters. Found two species of flatfish: one comes from the Barents sea to feed (marine flounder, American plaice), and the other lives in the White sea all the time (Arctic flounder, river and ershovite).
To the permanent inhabitants of the White sea are omnipresent Katran and polar shark, a secretive inhabitant of the depths. Both are not dangerous to humans. A rare but aggressive person can be a porbeagle, swimming away from the Barents sea.
Advice 2: What fish are found in rivers
Lovers of active recreation is very often engaged in fishing. The abundance of rivers on the territory of Russia makes this form of recreation popular among citizens. But not all novice fishermen know what fish are in the rivers, what are the conditions it prefers and what are its habits. Very useful in the study of the inhabitants of the water spaces can become special determinants and directories, compiled by scientists.
At present, there are over hundreds of species of freshwater fish that live in Russia. Not all existing types listed in their respective catalogues, the work in this direction is still being carried out by scientists of the Russian Academy of Sciences, who still find new species of river fish and are their descriptions. The difficulty here is that some species of fish crossbreed, resulting in hybrids. Such mechanisms of crossing widely used in the industrial breeding of fish.
The most famous inhabitant of rivers, of course, is the pike. This predator inhabits is typically in the coastal zone, abundant water thickets. Pike loves places with a weak current. This fish is very sensitive to the content of oxygen in the water, therefore, contained small ponds in the winter are often killed. The colouring of the pike can be very diverse and dependent on habitat and river vegetation. Being a predator, the pike eats mostly small fish.
Common river perch is also popular among wildlife enthusiasts and avid fishermen. He also belongs to the predators, so the main part of the diet of perch are other freshwater fish. As potential prey of larger pike, river perch tries to stick to flat water with little current. In some regions of the perch – not only the object of interest fishing the bait, it has also commercial importance.
Common in rivers and roach, which has on the territory of Russia several subspecies. This fish prefers to stay in packs, enjoying the protection of aquatic vegetation, snags, and hanging down to the water trees. Roach also does not like a fast current. Fish of small and medium sizes are not so shy as the large ones. Sometimes you can see the hybrid forms obtained by crossing common roach with Rudd.
Often in rivers can be found not only river fish, but also so-called anadromous species. Much of the time these fish spend in the sea, rising at the mouth of the rivers only in the spawning period. To through types include, for example, some types of salmon: trout, salmon, salmon.
River fish is a very valuable dietary product, which is significantly better absorbed than meat. She, among other things, are not as allergenic as compared with marine fish. In many regions of Russia, the production of various types of freshwater fish is an important component of the economy. Some species of these fish can be successfully kept in home aquariums.