Gemstones, also known as gemstones and gem spots, are fine varieties that can be artificially cultivated by Australia in recent years. The gemstone body is spindle-shaped, thick and oblate, with small head, open mouth, arched back of the head, large abdomen and rounded circle, 1-2 or even black crystals on both sides or side of the fish body. Oval-shaped plaques and sporadic small patches resemble beautiful gemstones embedded in fish, hence the name "Gemstones." The gemstones are alive and well and swim quickly. 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, which has obvious cluster feeding habits. Its survival temperature is 10 °C -38 °C, the best growth temperature is 20 °C -28 °C, 10 °C -15 °C slow motion or rest in the middle and lower layers of water. Gemstones have low requirements for dissolved oxygen, natural waters require dissolved oxygen above 2.5 mg/l, and factory-intensive intensities require above 3.5 mg/l. It has been proved by artificial trials that gems have the advantages of rapid growth, miscellaneous food, low oxygen tolerance, strong adaptability, and strong resistance to diseases, and can be cultivated in outdoor ponds in single-culture, mixed-culture, and reservoir cages. It is similar to the temperature requirements of tilapia, freshwater whitefish, etc. 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 of the fish mentioned above. The meat is delicious, has no smell and odor, nutrition and taste are good, and it is favored by consumers. When the temperature of the water rises to 20°C, the 3-5 cm seedlings of the current year will be placed. As long as the animals are carefully bred and managed, they will generally be reared for 4 to 5 months, and by the middle and early October, the fish can reach 400-500 g/tail. Its breeding efficiency is 4-5 times that of conventional fish, and it is a famous brand of structural optimization in freshwater aquaculture. The following is a brief introduction of the artificial breeding technology of gemstones. 1. Pond conditions: abundant water sources, rich dissolved oxygen, and water quality conforming to GB11607 standards. Pond area 2-3 acres / only, water depth 1.5-2.0 meters, equipped with aerators and other oxygen equipment. 2, cage conditions: set in the open waters, small waves reservoir reservoir Bay, the water depth of 10 meters or more, excellent water quality, rich in dissolved oxygen. 3. Stocking densities: The initial stocking density for cage culture is 20-40 tails/m2, the stocking density for ponds exclusively raised is 800-1000 tails/acre, and the stocking density for pond polycultures is 30-50 tails/acre. 4, feeding and management (1) clear pond disinfection: before the stocking ponds must be used 75-80 kg / mu clear lime pond disinfection; net cages use 30 g / cubic meter bleach disinfection, kill pathogens, and pre-stocking Water is ready for use in the week. (2) Feed and Feeding: Artificially formulated pellet feeds should be used, and crude protein content should be above 35%. The daily feeding amount accounts for 2%-5% of the fish's body weight, and is appropriately adjusted according to the weather, water quality, and actual food intake, and is fed 2 to 3 times a day. Feeding should follow the “Four Sets†principle. (3) Daily management: refer to conventional management measures for cage fish and ponds, implement pollution-free culture and standardization management. (4) Disease prevention and control: Adhere to the principle of “prevention and health managementâ€. The seedlings were bathed with 1%-2% saline for 5-7 minutes before stocking. In the normal breeding process, dibromohydantoin, potassium permanganate and other drugs are regularly sterilized. It should be noted that gems are very sensitive to copper sulphate and ferrous sulphate, so be careful when using drugs.
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