Desert freshwater breeding technology

Desert spot gums have a wide salt range, and the metamorphosed juveniles can be cultured directly in freshwater. Under suitable conditions, up to about 500g in the year, it has the characteristics of strong disease resistance, high temperature resistance, low oxygen resistance, and easy transportation. The economic value and nutritional value are high, and the breeding prospects are very broad.

The optimum optimum temperature range for P. gingivalis is 18~30°C, and the optimal salinity range is 5~10‰. The optimum pH value is 7.0-8.2. For indoor aquaculture experiments, cement pools of 3m3m and 0.6m are used, and underground freshwater is pumped to the cement pool for aeration for 4 to 5 days. The water temperature is 16 to 26°C, pH 5.9 to 6.0, and dissolved oxygen 6mg/L. Stocking densities of 22 fish/m2, body length of 5 to 6 cm and weighing 30 to 35 g; fry time June 14th. Throughout the aquaculture process, observe changes in water temperature and water quality, and regularly measure water temperature, dissolved oxygen, salinity, pH value, ammonia nitrogen, and hydrogen sulfide concentration. The daily water exchange volume is 1/3 in the previous period (June), 2/3 in the middle period (July), and 100% in the late period (August-September). Seed feeding fresh fish, the amount of 40% of fish weight, feed 3 to 5 times a day, regular, fixed, quantitative feeding, in principle, no residual bait. Artificially formulated feed: protein 40%, crude fat 15%, starch 12% and various vitamins 0.3 to 0.4%, processed into granules, particle size of 1.6 ~ 2.0mm.

Disease prevention and treatment usually use dibromohydantoin 0.210-6 to treat pool water. During the middle and late period of cultivation, some seedlings were found to suffer from albinism, and oxytetracycline 310-6 and Xinnuo (1 to 2) 10-6 were promptly used. After one week, the diseased fish basically recovered. . Growth on June 14 seedlings body length 5 ~ 6cm, weight 30 ~ 35g, to September 8 body length 19.1cm, weight 125g, 3 months body length increased 14cm, weight gain 95g.

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