Channel fish back to pond culture

Channel fish back to pond culture

Channel fork originating in the United States, with adaptability, fast growth, easy feeding, delicious meat and other characteristics, less meat, prickly, nutritional value and economic value is higher, the current domestic price per kilogram of fish is 20 to 25 yuan, It is 1 to 2 times tilapia and 3 to 4 times tilapia, which has great potential for development. This species is the main freshwater cultured fish in the United States. In recent years, large-scale farming has been carried out in Hubei, Guangdong, and other places in China, and good economic benefits have been obtained. In 1998, the Tai'an Fisheries Research Institute carried out large-scale breeding and achieved good economic benefits. Now we introduce its farming technology as follows:

The Pond Condition Pond is an oblong east-west direction with an area ranging from 1/15 to 1/3 hectare. The water depth is 1.5 to 2.0 meters. The drainage and irrigation are convenient. The water source is guaranteed. The water is fresh and pollution-free. The bottom of the pond is flat and the sludge is less. Hard bottom or gravel substrate. About 10 days before the fish species are stocked, clearing ponds are disinfected with 150 kg of lime per 1/15 hectares. After 7 days, pool water is added to the appropriate water level. Note that bleaching powder should not be used as clear pond drugs.

The stocking of stocked fingerlings is mainly carried out in two ways: main breeding and breeding. In the main pond, the return fish account for 80% of the stocked amount, and the stocking fish such as eel and squid that purify the water quality account for 20%. The main pool is not equipped with fish and fish that have high gluten content, such as codfish and clams. class. Each of the 1/15 hectares of the main pond is stocked with 800 to 1000 fish per 50g of body weight, while the rearing fish and seabream species of 200 to 300 fish are stocked at 75g. The rearing fish in the rearing pond accounts for 20% to 30%. Each 1/15ha stocking size is about 75g fish rearing 250 fish, and the other fish 700~800 fishes.

Feeding and management of fish species After 3 to 5 days of stocking, feeding and domestication are completed. Different formulas of compound feeds should be fed in different months, and domestic fish meal, soybean meal, bran, flour, yeast, vegetable oil, corn, and additives should be properly prepared. Made. Adhering to the “Four Sets” principle of feeding, feeds are fed from 3% to 40% of crude protein from July to September. They are fed 4 times a day, 2 times in the morning and 2 in the afternoon. From October to November, 35% of crude protein was fed. Feed twice a day in other seasons. When the water temperature is 20 to 30°C, the feed rate is 2% to 3%, and when the water temperature is 25 to 28C, it is 4% to 5%. The amount of bait was approximately 2 hours after the fish was eaten, and the feeding was performed using an artificial hand. Water quality adjustment standards are: transparency 30 cm, dissolved oxygen 5 mg/l or more, chemical oxygen demand 5 to 10 mg/l, pH 7.5 or so. In the spring and autumn, water injection is performed every 15 days and water is injected every 7 days in summer. Each injection of water is 20-25 cm. At the same time, the whole pond should also be splashed with lime water once a month for a negative concentration of 3010. Install one impeller aerator per tank to regulate water quality. A sulfa or furazolidone bait is administered for 1 course every 20 days, with a dose of 20010 minus 6 times per kilogram of fish and 5 days for 1 course of treatment. Quanchiposa solution of crystal trichlorfon is sprayed once every 15 days and the concentration is negative 0.36 to control fish diseases such as surimi and carp. In addition, water quality analysis and fish growth measurements were conducted once a month, and problems were found to be adjusted in time.

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