Experience of raising mandarin fish with self-breeding live bait

Last year, the area of mandarin fish culture in Wujiang City has exceeded 10,000 mu. Zhang Qifang, an expert in raising mandarin fish in the sixth farm of East Taihu Aquaculture Farm, raised mandarin fish in 20 mu in 1999, and the matching pond was 83.5mu (of which 44 mu was engaged in green shrimp re-culture). The yield of mandarin fish per mu was 613kg and the benefit per mu was 3163 yuan. the benefit of pure mandarin fish per mu exceeded 10,000 yuan; in 2000, the yield of mandarin fish per mu exceeded 700kg, and the average benefit per mu exceeded 3500 yuan.

Pond conditions: each pond has a water depth of 1.5 meters and a water depth of 10 mu. The water quality is fresh. The fish species are exposed to the sun for half a month before stocking, and the bottom material is hard. Dry clean the pond with 50 kg quicklime per mu 7-10 days before stocking.

Fish fingerling cultivation and separate culture

In early May last year, 35000 mandarin fish with summer flowers of 2.5cm were purchased and put into a pond of 5.6mu for fish breeding, with an average of 6250 fish per mu. Before the summer flowers of mandarin fish enter the pond, sufficient palatable feed fish should be cultivated in the fry pond. At the beginning of June, 31500 mandarin fish came out of the pond about 7 cm, with a survival rate of 90%. Among them, 22300 tails were put into 17 mu ponds (1310 tails per mu) and 9200 tails were sold. 6 million fodder fish (including fry, summer flower, fish fry, etc.) were consumed.

Feed the feed fish

The fish are cultivated in matching ponds, and the specification is generally 1/3 of the body length of mandarin fish. Feed fish 3Murray is fed once every 4 days. During the period of high temperature from August to early September, the amount of feed fish was controlled to slow down the growth rate of mandarin fish and reduce the incidence of disease. During the whole culture period, a total of 46700 kg of fodder fish was consumed (including 38000 kg of self-breeding), and the feed coefficient was 3.9.

Water quality management

Require fresh water, pH 7-7.5, transparency 35-40 cm, sufficient dissolved oxygen. Add 30 cm of water every half a month. Pour the outer river water into the hoarding pool before adding water. The water plants and plankton in the hoarding pond were purified for 5-7 days and then injected into the mandarin fish pond. At the same time, fungicides and insecticides were applied to mandarin fish ponds. Each pond is equipped with 2 3-kilowatt aerators and 1 8-inch water pump, which will be turned on in time from mid-July to mid-September according to mandarin fish eating, activities and weather conditions, usually 6-8 hours a day.

Prevention and treatment of fish disease.

⑴ feed fish can not draw water into the pond within half a month before pulling the net. 5mg / L potassium permanganate is used to bathe 15kg before putting into the mandarin fish pond.

During the breeding period of ⑵ fish, when the specification of mandarin fish is 2.5mi 5cm, it is mainly to control parasites (rotifer, oblique tube worm), and more than 5cm to control bacterial diseases.

From June to mid-September, ⑶ regularly used medicine to prevent the disease. First, Baidujing (or strong chlorine, Wanxiaoling, etc.) was used to disinfect the water, and the next day, copper sulfate plus fish Shuangling (or trichlorfon) was used to kill parasites. Every seven days.