Gemstones, also known as gemstones and gem spots, are fine varieties that can be cultivated by Australia from the past two years. Tests and trials have proved that gems have the advantages of rapid growth, miscellaneous eating habits, low oxygen tolerance, strong adaptability, and strong resistance to disease. They can be used for high-density breeding of indoor cement pools, single-cultivation of outdoor ponds, and cage culture of reservoirs. It is similar to the temperature requirements for tilapia, rainbow trout and freshwater white fleas. It is a thermophilic fish and does not tolerate low temperatures. However, its meat quality, nutritional value and market efficiency are much higher than those mentioned above. The proportion of gemstones, tails and tails is small, muscles are rich, no intermuscular punctures, delicate white flesh, it is determined to contain 18 kinds of amino acids, including 4 kinds of aroma amino acids, so it has a delicious taste, no smell, odor, nutrition and taste is Even today's expensive fish such as squid can not match. The gemstone body is spindle-shaped, thick and oblate, with small head, open mouth, arched back of the head, large abdomen and round abdomen, with one or two or more black crystals on both sides or sides of the fish body. The elliptical plaques and sporadic patches are similar to beautiful gemstones embedded in fish, hence the name “Gemstone”. The gemstone body is quail-scaled, with short and wide caudal fins and dimples. His life is active, swimming is rapid, and hi life inhabits the upper and middle layers of the water body. Under natural conditions, small fish and shrimp are used as food, and large live baits such as small leeks, red nematodes, and breadworms are eaten. Under the conditions of artificial breeding, they can be fed with pellet feed. There is a clear habit of catching and eating in groups. After a week of domestication, the fish can hear the knocking sound or the sound of splashing water and they will all come together to feed. Juvenile fish and salted fish can be fed with different particle size of dip material, depending on the water temperature, fish body weight and fish feeding conditions. The survival temperature of gems is 10-38°C, and the optimal growth temperature is 21-28°C. When the water temperature drops to 17-18°C, the ingestion intensity is weakened, and when the water temperature is 10--15°C, it is slow or still in the middle and lower layers of water. . Gemstones do not require high dissolved oxygen, natural waters require dissolved oxygen above 2.5 mg/l, and factory-intensive intensive culture requires more than 3.5 mg/l, and they can grow normally at pH values ​​ranging from 5.5 to 8.5. Seedlings raised after three years of breeding, weighing 1,000 grams, reach sexual maturity, water temperature above 20 °C, artificial injectable oxytocic agents, such as salmon pituitary, release hormone analogues or chorionic gonadotropin, can produce egg. The requirement for dissolved oxygen in the water during incubation is not less than 6 mg/l. The gems that have been cultivated in the factory for a long period of time have just been exposed to strong light and have been shaded as necessary when they have just been moved to outdoor ponds. Gemstones are very sensitive to copper sulphate and ferrous sulphate, so pay attention when using drugs. All areas with waste heat, underground hot water, and hot spring water resources can be used for production and seedling conservation. In particular, fish farms with the current water supply and facilities conditions for tilapia culture can be modified or slightly modified. Used to breed gems. In outdoor, when the water temperature rises to 20°C, fish species with a tail weight of about 100 grams will be stocked, the stocking density will be reasonable, and the formula will be properly fed into the pellets, which are normally kept for 4-5 months until early October. The commercial fish standard of 500 g/tail can be achieved, and the aquaculture efficiency is 3- to 5-fold that of conventional fish.

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