The English name of Scortum barcoo is Jadeperch, which is also known as gemstone fish and Australian gem spot. It is a squid-shaped fish and it is Australia's prestigious freshwater fish. It is considered to be the best fishing and food fish. It is very popular in Australia, Japan, South Korea, Hong Kong, Southeast Asia, and the European Union. The growth rate of gemstones is faster. After artificial incubation, under the appropriate water temperature conditions, the seedlings can develop commercial fish specifications. At present, the price of gem and fish market is 80-90 yuan/kg, and the aquaculture efficiency is 5-6 times that of conventional fish. The market prospect is good and it is a good variety of freshwater aquaculture product structure tuning. The gems can be cultivated in the factory. They are also suitable for pond breeding and cage breeding in reservoirs. Focused on cages, high-yielding culture and gemmological technology. 1 Water conditions Cage culture The waters of gemstones can be either reservoirs or wandering, or even larger ponds (generally above 3.3 h?, with a water depth of 2.5 m or more). The water quality is good and there is no pollution, which meets the GBll607 standard. 2 Net cage structure mesh size to be determined according to the size of the fish species, the general requirements in 2.0-3.0cm, nets at the bottom of the 1.5cm, box depth requires more than 2.0m, adult fish cages can be 10-100? Take a big cage as well. For the cultivation of fish species, cages can be made from summer nets and put into the water 1 week before the fish species enter the tank. The frame of the cage can be fixed with angle iron and cement reinforcement, and a simple bamboo frame can also be used. 3 Seed stocking gems When the water temperature rises above 18°C ​​in May, stocking begins. Select good-quality peasants with strong physique, lively swimming, neat specifications, and no disease or injury. Stocking density is 20-40 tails/?. According to the characteristics that the seedlings of gems and gems are sensitive to changes in water temperature, the temperature difference should not be too large when the seedlings enter the box, and should not exceed 20°C. Before entering the box, disinfect fish with 1.5%-2.0% saline for 7-8min. 4 Feed and feed requirements are buoyant full-price pellets, and the crude protein content is 35%-45%. At present, artificially cultivated fish species are cultured in cages without domestication. During the feeding process, the gemstones fiercely snatched food. It is best to place a frame to prevent feed from drifting inside the box. Gem and coop cage culture should be strictly regular, fixed-point, quantitative feeding, the daily feeding rate of 1.2% -7%, feeding 3 times -4 times a day, the amount of 80% of the amount can be mastered. Feeding time is from 7-8 am until 18-19 pm. 5 Daily management (1) Strictly implement the early, middle and late-night inspections system to observe the fish's feeding and activities carefully and remove the residual baits promptly. (2) Do a good job in the breeding diary to record the daily temperature, water temperature, feeding amount, and the number of deaths that have occurred. If abnormal conditions are found, take timely measures. Check the cage regularly for damage, and repair the damage promptly. A black shading nylon cloth or bird net is attached to the upper part of the cage. (3) Cleaning the cages in a timely manner Clean the cages regularly, and be careful when cleaning to prevent the stones from being injured due to excessive jumping. (4) Dividing regularly on a regular basis The growth rate of gemstones is very fast. After breeding for a period of time, there will be differences in specifications between individuals. They should be binned in a timely manner to avoid polarization and to improve the survival rate. 6 Fish disease prevention and control adhere to the principle of “prevention and health managementâ€. The seedlings are stocked with 1%-2% salt or 0.4g/m3 dibromohydantoin and other drug medicated baths at the time of each binning, and use 15g/m3 in the cage every 20 days or so. Lime and 0.3g/m3 dibromohydantoin were used for disinfection. Illegal drugs are strictly prohibited in the waters surrounding the cages.
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