species

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Disease predatory fish

The causative agent in fast-flowing water persists for long (in hours). Its virulence is low, as it usually causes disease in immunocompromised fish spawning. After amplification of their virulence by passaging in the body is weakened fish it causes disease in a large number of fish in the form of epizootic outbreaks.

Ehpizootologicheskaja data. Disease in pikes usually occurs within a few days after spawning (March – April). The most susceptible Mature individuals. The perch, bream, roach and burbot the disease recorded in the summer. The emergence of the disease contributes to cold spring, especially during the spawning period of pike. Then the flash increases and reaches maximum development during the summer months. It fades by the end of summer,

Epizootic process can continue in a large body of water (reservoir, lake) for several years and spread to other reservoirs-current water with transportable or migratory fish. The source of infection are sick and dead fish, microbiological. They are contagious from the beginning falls into the water with secretions, or the decomposition of corpses. Most researchers believe that infection occurs via povrezhdeniya the skin, mucous membranes, intestines. Continue reading

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Aquarium fish living in the upper layers of wate
Aquarium fish — ornamental fish. which are contained in the aquariums. Aquarium fish originate from China. The Chinese began to breed aquarium fish since 2000 BC. The content The family…

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Guide to the 10 greatest aquariums on the planet
In the XXI century, and this means that everyone can afford to see the underwater world. On land, too many interesting, exotic creatures living there, where people started to come…

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Recipes of preparation of dishes from catfish
Fish baked in Russian 800 g catfish, 4 potatoes, 30 g cheese, 30 g butter, 2 tbsp. tablespoons vegetable oil, 50 g of mayonnaise, salt, pepper. Pieces of raw fish…

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