Imperial fishing – the angler and the fish!
Type of feed fish are divided into four groups:
– benthos feeders — fish, feeding on small organisms living on the bottom or near the bottom (benthos), sturgeon, grayling, bream, ruff, etc
– planktology — fish feeding on organisms living suspended in the water column (plankton), Zope, sabrefish, bleak, verhovka, etc.
– mixed feeding — fish feeding on organisms such as benthos and plankton, — roach, bream, IDE, Dace, etc.;
predators — fish that feed on other fishes or animals of their own species — pike, pikeperch, perch, Chub, burbot, catfish, trout, salmon of the Danube.
Divide fish into groups not only depending on the composition of the consumed feed, but also from the places where they feed mainly in coastal, demersal areas or in the upper layers of water. However, all these dividing into groups to some extent conditional, as between each of them can have mutual transitions. Thus, the diet of juveniles differs from the food of adult fish. The larvae of most species feed on small aquatic plants or small aquatic animals, such as rotifers; the grown the fry begin to feed on larger animals like crustaceans. The fry are peaceful fish — bream, white bream, carp, UCLA, roach, etc. — feed on plankton during their first year of life, whereas young fish of prey (pike) pass to feeding by larvae and fry fish until one year of age.Species such as bleak, Zope, sabrefish, and by adulthood feed on as juveniles, using mainly planktonnye organisms. Great place in the diet Sichel, UCLA, Chub take flying insects (midges, caddisflies, mayflies). Bream, carp and ruffe in adulthood eat mostly organisms that comprise the benthos of the reservoir, mollusks, worms, insect larvae. Adult fish-predators can feed on as juveniles, and adult fish.
Fish eats better when the temperature increases up to a certain limit and when there is enough oxygen in the water. During the day she eats varies actively. Most fish feed up in the morning or in the evening, planktivorous in the day and predators at night.
In many species clearly expressed the daily movements associated with their food. Fish holding the day in the riverbed and poorly fed, the night comes to the backwaters, where more abundant than in the mainstream, the development of food organisms. Such movement characteristic, in particular, the Dace, the gudgeon, and some other. They are followed by predatory fish — catfish, perch, etc. Some types night drops in near-bottom water layers and during the day rise to the surface due to the movement of food organisms. During spawning, the manufacturers of most of the fish almost never feed on. Many fish feed is limited in winter or do not eat.
The lifespan of different species vary. Some people live only a few years and are small, others tens of years, reaching a large size. For example, the Beluga can live more than 100 years old, her weight at this age can exceed 1000 kg, whereas the length of the verhovki does not exceed 8 cm, weight — 10 g, and with a life expectancy of four years. Freshwater inhabitants the largest fish of our waters is the catfish, reaching lengths of over 2 m and weigh over 100 kg.