caspian

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 the North, Baltic, Black, Caspian and Aral sea. From southern Sweden and Finland to Turkey. However, it is not the Mediterranean basin.

General information

Wels catfish is a large freshwater predatory fish accesata. Has a soft, fatty meat and white meat.

Long anal fin, adipose fin absent, unpaired fins have no spines. Spawning in spring in the littoral zone among the aquatic vegetation. The female lays eggs in the nest, which the male guards. Sexual maturity usually in the fifth year of life. Mainly a scavenger, but can eat quite large fish, known attacks on waterfowl and domestic animals. Catfish caught mostly on carrion or spoiled products. Continue reading

The threat of the black sea hydrobionts

Toxicity is a universal and widespread phenomenon in nature. Many inhabitants of the seas and oceans have become toxic in the process of their continuous development and adaptation to the environment. They use “toxic weapons” of diverse chemical composition. Among poisonous animals forms occur in almost all taxonomic groups.

Toxins entering the body (through a bite, a shot of the fins, eaten by fish), usually affect the Central and peripheral nervous system. In addition, the protein composition of toxins can cause severe allergic reactions.

The toxicity of poisons depends not only on kind of marine life, as well as its age and gender, conditions of growth and nutrition, time of year and habitat. Given the rapid development of toxic effects, in the treatment of poisoning poisons marine life are of great importance to measure the first self – help and mutual aid, as discussed below.

In the Black sea, in one of the most “poor” in species composition (after the Caspian and Azov) seas of our Planet, fortunately there is very little threat to humans aquatic organisms, and in this respect it can be stated that the black sea lucky divers. We have no deadly coelenterates (flowing down), such as a very poisonous jellyfish and hydroids. In the Black sea do not live dangerous sea urchins and stars and we have monopati in the hands of any shellfish without fear to get a lethal injection, as from poisonous cone. Continue reading

Treatment of aquarium fish
Symptoms: scales are sometimes swells, it forms a swelling, sometimes bleeding, is darkening of the gills. The behavior of the fish are restless. Cause: the maximum allowable values of oxygen…

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The most beautiful aquarium fish
Graceful bright aquarium inhabitants attract attention because of their dimensional action in the water surface. Today we offer you to admire the most beautiful aquarium fish. Royal zentropy This fish…

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Question and answer on the care and maintenance.
The key to a healthy aquarium – the right choice of its inhabitants and care for them. This will be devoted to several topics, including how to choose and set…

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