Prevention and control of fish helminthiasis
Fish diseases caused by some species of flat animals, linear animals and annelids are called fish helminthiasis such as ring disease, third-generation disease, trematostomia, tongue disease and so on. Prevention and control methods:
1. Sprinkle the whole pool with 0.65-0.7 microliter / liter crystal trichlorfon.
two。 Thoroughly clear the pier with quicklime and kill the snails. Copper sulfate can be sprinkled in the seedling culture pond to make the water 0.7 microliter / liter, with an interval of 12 to 24 hours, and sprinkle again at the same concentration.
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Parent fish cultivation techniques of four major domestic fish in spring
Spring is an important period for gonadal maturation of parent fish. From the beginning of spring to spawning, a large amount of nutrients in parent fish are transferred to gonadal development, so the cultivation of parent fish should be strengthened in spring to meet the needs of gonadal development and promote timely maturation and smooth spawning. The cultivation techniques are as follows: 1. Divide the pond ahead of time. Adjusting stocking density and breed matching is the first condition to cultivate good parent fish. The area of the pond separated by the parent fish should be 2000 square meters and 2600 square meters. Drain the pond water before dividing the pond to remove wild miscellaneous fish, clams and enemy pests, and at the same time remove some of the pollution.
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Processing method of liquid fish protein feed
Liquid fish protein feed is waste or low-value fish processed by aquatic products. After mincing or grinding, a certain amount of acid or microorganism is added to ferment, and the fish body enzyme produces autolysis to liquefy it into slurry products. Because this protein feed has the quality of storage resistance, it is also called acid storage feed. lactic acid bacteria fermentation (molasses fermentation) natural lactic acid bacteria fermentation no pollution source or no disease raw fish minced, according to its weight ratio of 15% added molasses or sugar cane sugar
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