Description of fish: Grayling

GRAYLING (Thymallus thymallus) and European grayling differs from other species of the genus a small mouth, i.e. (upper jaw does not go beyond front edge of eye). The teeth in the jaws very weak, almost imperceptible, Gill rakers 20 to 29. Its color is very bright: back and upper sides of small round black spots, on flanks brownish longitudinal stripes. The paired fins are yellow or red, Gypsy purple, on dorsal fin quadrangular bright spots arranged in rows. Marriage dress is reflected in the brightening of the color. In males, it also increases the height of the rear part of the dorsal fin. Size grayling does not exceed 50 cm, weight is usually 0.5 to 1 kg, but marked case of capture instance 4675 Distributed in G. the European grayling is widely. Its range encompasses almost the whole of Europe — from France, England, Germany, Denmark, Scandinavia and Finland to the Ural mountains. To the South it goes to Switzerland, Danube Delta and the Dniester, in the upper reaches of the Volga and the Urals.

No grayling only in the basins of the Dnieper, don, Kuban, Crimea and the Caucasus. Wherever there is a common grayling, he prefers fast rivers with clear water, where the pit (Bocage) alternate with rapids. In some places he goes and in lakes Ladoga, Onega, and Imandra, accutane spawning occurs in the river. Grayling of our North often leaves space in estuarine rivers (Kara lip) and some where found in quantities sufficient for commercial fishing. Grayling, in General, is a predatory fish, Continue reading

The colonization of an artificial lake with decorative fish

Construction technology

Many artificial lakes to commercial use zaryblyayut different species of fish, which, being part of the water community, maintain the pond in a full-fledged state.

Depending on the size of the artificial lake, and destination of fish in the pond (decorative feature for catching fish, etc.), the ratio of species group of fish at check-in may be different.

In General, all species of fish that inhabits the artificial lake, can be divided into 3 main groups:

1. Carp, crucian carp, silver carp, pike – can be up to 80% of the total number of fish in the pond. These fish are the main inhabitants of the large artificial lakes, particularly lakes open type, and is mostly meant for ponds in which the accent link is fishing.

2. Additional exotic fish to catch. The stocking of ponds can be more interesting and unusual fish species: white grass carp, whitefish, sturgeon and trout . These fish are mostly “flavor” that attracts fishermen. Some of them require every year to re-buy and run into the pond. Spend the winter in our latitudes, most of them can’t. Continue reading

Fish species bred in ponds

Carp is a domesticated form of carp, bred by a long selection work. From wild carp the carp is a more efficient use of feed, and in this regard, and grow in similar conditions carp diet. On other biological characteristics of carp and carp are very similar.

It is best to feed and grow carp at a temperature of 25-29°. When the temperature of the water feeding intensity of carp intensified, but the costs of the feed decreases due to the fact that the content of oxygen dissolved in water at elevated temperatures considerably below, than at lower, and the metabolic processes it needs more. In case of insufficient concentration of oxygen dissolved in water is bad carp to digest food.

Normal oxygen content in the water for carp believe about 5 cm3 in 1 L. the Allowable concentration is considered to be 3 to 3.5 cm3 in 1 L.

Sexual maturity carp reaches 4-5 on the year, but there are cases when it begins to multiply in third and sometimes second year. Males typically Mature somewhat earlier than females. The carp spawning occurs when water temperature 16-48°. Fecundity is usually estimated in 180 thousand eggs per 1 kg of body weight of the female. Continue reading

Dangerous fish of the red sea
To skorinova fish, is a few dozen genera, including several hundred species. Almost all skorinova – benthic fish. The shape of their body is very diverse.carried how many soft rays.…

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Wels catfish.
length: 5 m; weight: 300 kg; production season: favorite subject of underwater hunting from spring to late autumn. Habitat Widely distributed in Europe and Asia. It inhabits the basins of…

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The most dangerous creatures living in the seas and oceans.
Despite the fact that the man himself is a predator by nature, in the ocean, there are many sea creatures which pose a danger to humans The most dangerous creatures…

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