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
