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 3-5 years old, and sexually mature individuals spawn at egg temperature of 8-12°C in February-March each year, and are egg-sinking and pale 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 container is a glass steel flat row trough (40 centimeters, 30 centimeters and 20 centimeters), which is cultured in flowing water, and the flow of influent water is 18-20 liters/minute, and 100 watts of fluorescent light is set at 60 centimeters above the water surface. 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 size is 0.3-0.5 mm.
3, fish breeding
Take a stream pool cultivation, flow pool with cement pool, single pool area 30-90 square meters, pool depth 60-80 cm, water depth 50-60 cm. The pool is 1.2-2.5 meters wide. The bottom slope of the pool is 2:1000-5:1000. The water flow in the flow basin is 100-300 litres/minute and the water depth is kept at 50-60 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 pool is 6.67 meters wide, the pool is 30 meters long, and the bottom slope ratio 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 scale for the growth of squama, and the optimum temperature for growth is 13-16 °C. The maximum temperature of the fish should not exceed 20 °C. Pool water exchange rate should be more than 2 times / hour, flow rate to maintain 0.02-0.16 meters / second. Dissolved oxygen in water is more than 6 mg/l, ammonia nitrogen should be controlled below 0.0075 mg/l. Size 20-50 grams of fingerlings, stocking density is generally 150-300 tail / square meter; specifications of 100 grams of fingerlings, stocking density is generally 150 / square meter; specifications of 150 grams 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 3-5 cm. Stocking density should be 10-30 tails/mu. The 1st instar fingerling size is about 25g, and the stocking density is 5-10 tails/mu, which is suitable for wintering in the late autumn and early winter to the depths of the deep river. It is generally conducted from 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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