Loach on the Yellow River Plateau
Common name: Pike
Place of origin and date of delivery:
Distributed in the trunk and tributaries of the upper reaches of the Yellow River.
Introduction:
Any of various large fishes of the family Loach. The head and body forequarters are flat, and the tail stalk is low and long. The mouth is large; the lips are narrow and smooth or shallowly wrinkled. It must be of medium length. The lower part of the unbranched dorsal fin hardens. The body is scaleless and the skin has short rod-shaped cortical prisms.
Living in gravel sediment rapids, carnivorous. From April to May every year, when the river melts ice, it spawns against the current, which has a certain economic value.
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What should pigs pay attention to when feeding bean cakes?
Bean cake is a high-quality feed for pigs, which contains about 40% crude protein and 6% Mel 8% fat. The content of crude fiber is very low, only less than 5%. Lysine accounts for 2.9% of protein, methionine and tryptophan each account for 0.6%, the content of amino acids is higher than any other plant protein feed, is one of the highest value of plant feed. Bean cake has a fragrant flavor, pigs like to eat very much, but lack of vitamin D, carotene and calcium. Should supplement some carrots and bone meal, stone powder and other mineral feed. The amount of bean cake should not be excessive, which generally accounts for 15% of the diet
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Breeding techniques of parent fish in silverfish culture
1. The source of parent fish. Sexually mature individuals caught in the breeding season can be used for artificial reproduction; sexually mature individuals can be used for artificial reproduction; individuals that are not sexually mature shall not be used for artificial reproduction. two。 The fishing of parent fish. The fishing of large silverfish should be carried out during the peak spawning period. fishing can be started in the north of the Yellow River in early December and in the south of the Yellow River from mid-December. Fishing gear can be Gill net (mesh 2a is 1.5-2.4 cm) or ice
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