Typical representatives of the nekton is the herring. It is well known that this fish has great commercial value. Until comparatively recently, it was promyshlyali in such large quantities that its price was very low, despite excellent taste and nutritional quality. In recent years, due to the sharp increase of the fishing fleet and introduction of intensive methods of production occurred overfishing. The number of herring in the oceans have decreased dramatically.
If in the future the intensity of the herring fishery will increase or even remain at current levels in the coming years, this valuable food fish will become a Museum rarity. Reduction of stocks of herring and concerned consumers and fishermen, but the first sounded the alarm scientists.
The appearance of the herring is well known to everyone, but it is unlikely that the layman can easily distinguish one kind of herring from another: the difference between them for the untrained eye to be insignificant. Species differences are not only in the details of the structure and the size of the fish, much deeper than they differ from each other in biology, numbers, distribution. Therefore, the fishery for mackerel fishes should be strictly subordinated to scientific data, to each type needs special approach. Continue reading
Such fish as carp and tench in the main lead independent lives and inhabit deep waters, in stagnant water, away from other fish. White and motley silver carp are quite large fish and can reach a weight of over fifty pounds. Love the warmth, eats the phytoplankton, and green algae. Channel catfish often exceed thirty pounds. To food consume almost everything that may feed on small fishes. The eel is a predatory fish with a long torso and feeds on other fish eggs, small fish, frogs. Pike is a predatory fish, into the diet of its food consists of the larvae of dragonflies, leeches, tadpoles, and other fishes.
Of course, to the fish to ensure the most suitable conditions for the existence of their need to feed. There are many videos, which explains the intricacies of proper nutrition of freshwater fish in home waters. Food can serve as feed for pigs, as well as special mixtures, wide range of which are sold in pet stores. At one time you have to throw so much feeding, how many fish can eat in 5-10 minutes. Continue reading
Katran – black (Squalus acanthias ponticus)
Reaches a body length of 2 m (usually 1.5 m). Found only in the Black sea waters to depths of 60 m.
Attention. All kinds of old-fashioned recourses are at the base of the dorsal fin spines small venom glands. When you shot the venom and mucus enter the blood stream and cause local poisoning, often accompanied by severe pain and inflammation.
The naked body is olive-brown above and whitish below. Leads benthic lifestyle, often buries itself in mud and sand. The predator, eats fish. Viviparous species. Body length is more than 1.8 m, weight about 20 kg. In our waters common in coastal areas of the Black and the southern part of the Azov sea common to the coast of Europe to England. The stingrays are very dangerous in water and outside of it (caught the bait, etc.) because they can cause serious injury to the poisoned needle. Known cases ended disability and even death of victims. Continue reading