Mackerel is a common and very important fish for the fishery. It is small, silver with a dark back and a barbed bone nail file along the sideline. Mackerel overwinter in the deep, going in large schools, spawn all summer. To the shore suitable only at the end of October, because they prefer cool water.
Mullet – the most unpretentious of our commercial fish. Spawns in the coastal zone to a depth of 75 meters, however, can proliferate in the open sea. Withstands water temperatures from 0.5 to 38°C, salinity to 80 g per liter, but lives in polyprenol water. Tolerate the lack of oxygen in the open sea swims, even in the deeper layers with “rotten water” and hydrogen sulfide bacteria. Mullet indifferent to polluted water and often winters in the ports under jetty. Its meat, unfortunately, begins to smell of fuel oil.
Fish-bed boppers – master to change the colour and even the patterns of his skin, repeating pattern and color of the soil. Floating over a familiar bottom, flounder disguises itself in just a few seconds. To select a color for the new background, take a lot more time, however, expanding and compressing the special pigment cells on their side, it can adapt even to the chessboard. Continue reading
An important reserve in increasing fish productivity is the introduction of fish culture in the practice of the method of joint cultivation of fishes of several kinds . that most fully use feed resources of the reservoir. Practice confirms the possibility of growing in a variety of combinations that reduce competition for food fish such as carp, carp, white and variegated silver carp, white Amur, etc.
Silver carp . With the introduction into farms of joint cultivation of fishes of the composition of the productivity of fish in ponds is 20 – 30 kg/ha water area. When grown with carp and herbivorous fish in pond farms of the southern areas by herbivorous fish receive an additional fish for at least 6 – 10 t/ ha, in ponds in the forest-steppe up to 3 – 5 kg/ha.
The silver carp eats all types of algae that occur in fresh water. Its power is supplied by filtering phytoplankton through a kind of arranged Gill apparatus. In Biotechnics of artificial breeding using the method of pituitary injections, where to produce offspring using the pituitary glands of fish / kg females. The ripening females after hypophyseal injections depends on the temperature conditions in the spawning basins. When ripe, the prevailing temperature of 21 – 26 degrees Celsius. Continue reading
The conservation of pond fish in the winter.
During the construction of pond is necessary to provide in the pond wintering pit with a total depth of 2 m, 2.5 m is better (for Moscow and Moscow region). This hole should easily fit all pond fish. Keep in mind that koi can grow up to 60-70 cm. the Second condition is that the pond never completely covered with ice . Must always be a hole for air exchange. Toxic gases generated by rotting organic matter needs to go outside, the water must be oxygenated. Even two days the concentration of marsh gas can reach concentrations that are dangerous to fish. Constantly punching a hole in the ice is not recommended – you can stun or scare the fish, forcing them to move actively, which is not very good during the rest period. To maintain ice-free polynyas are of special devices . Their main principle of operation is to raise the warmer water layers at the surface, not allowing the ice to freeze. Even better would be to feel the fish, if you equip a small reservoir with an air compressor . His pipes and nozzles should be located near the wells warm – not cold. To install all the equipment, of course, in the fall, before the first ice.
If for some reason, to install electrical equipment should not be necessary for solicitante. However, drilling they need more often that the pond was completely covered with ice. This ice can break up a hammer – the fish can suffer from shock. Emergency the easiest way to make a hole in the ice – put a pan of hot water and wait until it melts. Continue reading