Steelhead (Salmon gairdneri) is a salmon and aquarium. Originated from the Kuskokwin River in Alaska, United States, and the Peace River in British Columbia, Canada. As the contribution of genetic engineering and the continuous improvement of domestication methods, hard-headed plover has been able to achieve intensive farming in freshwater. The hard-headed plover has no history of breeding in China. It was introduced from the United States in 1998 and is currently undergoing demonstration farming in Beijing. 1. Life habits of hard-headed lice are cold water fish, can survive in the water temperature of 0.6 ~ 25 °C, the optimum growth temperature of 10 ~ 18 °C; habitat requirements require clean water, plenty of water, oxygen, dissolved oxygen 6Mg / l or more to normal growth The most ideal dissolved oxygen content is 80% saturation; it is more adaptable to salinity, and can live normal water from fresh water to 8‰ salinity. 2. The hard-to-eat hard-headed carp is a carnivorous fish, prefers to eat fish, benthic animals, aquatic insects, and also eats plant debris; the first-instar fish is dominated by zooplankton and zoobenthos; the Lord. Under artificial breeding conditions, artificial feeds are also preferred, and their food intake varies with water temperature and dissolved oxygen. The water temperature was 10-18°C, Do 8 Mg/l was the highest appetite, and Do 5 Mg/l was lower than the appetite. 3. The growth of one-year-old fish can weigh up to 50-200g, the weight of second-instar fish can reach 500-1500g, and the weight of third-instar fish can reach more than 2000g. Generally, the second-age fish can reach 0.5kg/tail or more. 4. Intensive cultivation of key technologies (1) strictly control the water temperature below 18 °C; (2) Do a good job of prevention. Among them, the key to epidemic prevention is the control of water quality (see table), “Four Ding†feeding, timely cleaning, and disinfection with 1% saline (once a week). The ideal standard of water quality Name continuous upper limit (ppm) Ammonia (non-ionic) 0.0125 Cd (soft water, hardness 100ppm) 0.003 Chlorine 0.03 Copper 0.006 Hydrogen sulfide 0.002 Lead 0.03 Mercury cap 0.002, average 0.00005 Nitrite soft water 0.1, Hard water 0.2 Ozone 0.005 PCB 0.002 Suspended Solids and Settlement Solids 80 Zinc 0.03 (3) The feed for hard-headed razor clams requires more stringent feeds. The artificially-mixed feed contains more than 45% protein in the fingerling stage, of which the animal protein should not be less than 70%; The content of more than 40%, of which animal protein should not be less than 60%, and require palatable, good quality, and stored in a dry low temperature.
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