Fishing techniques of beach enclosure on large water surface
Due to the large area and difficult fishing, most farmers still release water to fish during New Year's Day and Spring Festival every year, which not only wastes water, but also affects profits due to the concentration of fresh fish on the market. In order to solve this contradiction, the technicians of the farm in Linhai Farm of Jiangsu Agricultural Reclamation have explored the new technology of beach culture and fishing in large water surface after years of practice.
The technology is to make use of the habit of fish to swim at the top, to build a fishing pond with a width of 3 meters, a length of 5 meters and a depth of 2.5 meters at the change water outlet of the fish pond, leaving a water outlet 1 meter wide on the side facing the fish pond. The outlet and the water exchange outlet should be in a straight line, with grooves and small gates made by fish nets. As long as new water is injected into the fishing pond, the fish will swim into the fishing pond. A pond can fish 2500-5000 kilograms at a time. It can also be done to catch the big and stay small.
By using this technology, no matter how big the water surface is, it can be caught in turn in four seasons and listed in a balanced way, which not only speeds up the stocking cycle, but also improves the utilization rate of fish ponds. Last year, with the application of this technology, 250000 kilograms of commercial fish sold in rotation sold more than 1.5 million yuan.
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Release technology of silverfish in reservoir
As far as possible, the choice of release site is in the reservoir bay with a certain distance from the shore, a water depth of about 2 meters, and rich in small-scale bait organisms such as hard sediment or gravel bottom and insects, and several delivery sites should be selected at the same time to avoid failure caused by improper delivery of one point. Fish egg delivery method when the fertilized eggs are transported to the destination, the nylon bag containing the fertilized eggs is first put into the water. When the water temperature in the bag is basically the same as the water temperature in the reservoir (the temperature difference is less than 3 ℃), the fertilized eggs are dispersed into the water slowly and evenly, and each input point should have a certain standard.
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Common diseases and prevention in fragrant fish culture
Vibrio disease 1. Pathogen: mainly Vibrio anguillarum. 2. Symptoms: according to the type of Vibrio infection, it can be roughly divided into three types: yellow liver type, intestinal tip type and ulcer type. the diseased fish swim weakly, blacken, exophthalmos, epidermis bleeding, go deep into the muscle layer, the inner surface of the operculum, the base of the fin and the snout end congestion and then ulcer, anal redness and swelling, light Gill color, enlarged liver of diseased fish, some all fade to khaki, some local fade, hyperemia. There are blisters full of blood in the liver of diseased fish, gallbladder enlargement and vesicles.
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