The natural state of the sealiner is inhabiting in the water with low water temperature and fresh water, and in winter it is wintering in the deep pool of river tributaries or in the river. Carnivorous fish, mainly feeding on invertebrates, small fish, etc., also prey on frogs and small rodents. The earliest mature age of squama is between 3-5 years old. Sexual mature individuals spawn at egg temperature of 8-12°C from February to March each year, and they are egg-sinking and light yellow. Larvae like to lurk in the gap between the gravel, infrequent flow, usually with small fish, aquatic insects, small animals and plants living on the shore of the water for food.
1, larval rearing
The culture containers are FRP flat row troughs (40 cm, 30 cm, 20 cm), aquaculture, influent flow of 18 to 20 l/min, and 100 watts of fluorescent light installed above the water surface at 60 cm. Stocking density is 10,000 per tank. The newly hatched larvae have a total length of 14-16 mm.
2, juvenile fish cultivation
Juvenile ponds are 10 meters long, 2 meters wide, and 30 cm deep. When the larvae absorb 2/3 of the yolk sac, they gradually float and swim in the water. The juvenile stocking density in the flat trough is 6000 fish/m2, and the juvenile fish stocking density in the juvenile fish pond is 3000 fish/m2.
When juvenile fish float rate of more than 50%, feed open feed, open feed to artificial feed is appropriate. Artificial juvenile feed with 45% crude egg content can be used, but the fat content should be above 12%. The feed particle size is 0.3-0.5 mm.
3, fish breeding
A flow pool is used for the cultivation. The flow pool is made of concrete pools with a single pool area of ​​30 to 90 square meters, a pool depth of 60 to 80 centimeters, and a water depth of 50 to 60 centimeters. Pool width 1.2 to 2.5 meters. The bottom slope of the pool is 2:1000 to 5:1000. The water flow rate in the flow basin is 100 to 300 liters/minute, and the water depth is kept at 50 to 60 centimeters. The stocking density was adjusted according to the growth specification of the fine scale fish. Specifications 5 grams of fingerlings, stocking density is generally 1000 / square meter; specifications 10 grams of fingerlings, stocking density is generally 800 / square meter; specifications 20 grams of fingerlings, stocking density is generally 600 / square meter Specifications 30 grams of fingerlings, stocking density is generally 500 / square meter.
4, adult fish breeding
Flowing pond culture: using cement pools. The concrete pond is rectangular and has an area of ​​200 square meters. The depth of the pool is 100 centimeters and the depth is 80 centimeters. The pond is 6.67 meters wide and the pool is 30 meters long. The slope ratio at the bottom of the pool is 12:1000. Ponds are arranged in parallel. The water source selects groundwater with a lower water temperature. The optimum growth water temperature of 13- 20°C is the optimum growth water temperature of 13-16°C. The maximum water temperature should not exceed 20°C. The pool water exchange rate should be more than 2 times/hour, and the flow rate should be 0.02 to 0.16 meters/second. Dissolved oxygen in water is more than 6 mg/l, ammonia nitrogen should be controlled below 0.0075 mg/l. Specifications 20 to 50 grams of fingerlings, stocking density is generally 150 to 300 / m2; specifications of 100 g of fingerlings, stocking density is generally 150 / m2; specifications 150 g of fingerlings, stocking density is generally 100 Tail / square meters; specifications of 200 grams of fish species, stocking density is generally 75 / square meters; specifications 300 grams of fish species, stocking density is generally 50 / square meter.
Lake proliferation: Choose lakes with dense grasses and waters (coverage is better than 90%), clear and transparent water, no pollution in summer, maximum water temperature in summer not exceeding 20°C, dissolved oxygen in water not less than 5 mg/l, total suspended solids in water It is advisable that the waters in the range of 15 mg/L or less should be released and proliferated, and there should be abundant benthic animals, aquatic insects, and small fish and other food organisms. It is possible to stock juvenile larvae and juvenile fish. The juvenile size is preferably 3 to 5 cm. Stocking densities should be 10 to 30 tails per mu. The 1st instar fish species size should be about 25g, and the stocking density should be 5~10 tails/mu. Suitable for the habit of migrating to the depths of the deep river in the early autumn and early winter, usually in late September to early October. Fishing, otherwise the fish will dive deep into the lake to prepare for winter and it is difficult to fish.
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