Stingray, also known as G. striata and G. jasminoides, is a warm-water fish with strong adaptability and can be cultured in various waters. Its delicate meat, delicious taste, is the best-selling fish on the market and has a high breeding value.
For stocking grass and silage, farmers usually use baler machine to make them as round bales.
There're many types bale machines, some big Bale Machine can pack big bales weight about 1ton or more, its packing and delivery all need big machines as it's difficult for human to move.
Big farms with lots of grass usually pack big bales, for small farms, farmers usually pack small bales.
Small bales usually weight 70-90kgs, diemeter about 1m, wrapped with Silage Film 250mm width.
For small farms, small bales are much more suitable for silage stock, and small bale machines are more popular.
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Stingray prefers to rest in still or slow flowing water. The survival temperature is 0 °C ~ 30 °C, the optimum growth water temperature is 22 °C ~ 27 °C; the most suitable pH of the water is 7 ~ 8.4; the amount of dissolved oxygen in water is 3 mg / l or more. Under natural conditions, the larvae that have just emerged from the membrane for 3 days to 4 days are bred with their own yolk; at the seedling stage, they are baited with rotifers, cladoceras, leeches, and other aquatic insects. Artificial breeding can feed minced fish, shrimp and molluscs, but also feed formula feed. The female of the stingray is sexually mature at 2nd age and mature at 3rd instar. The water temperature is 24°C～26°C for the breeding period, the amount of eggs for each tail is 4,500 to 5,000, and the eggs are viscous and dehydrated. The fertilized eggs hatch about larvae for about 72 hours at about 25°C. The specific culture methods are as follows:
1. Single-cultivation ponds that are close to the water source, have convenient drainage and drainage, and have a water surface area of ​​1 mu to 3 mu and a water depth of 1 m to 1.5 m, are installed with water inlets and drainage barriers. After the dredging and disinfection, the weight per mu of water surface is 10 About 3,000 grams of stingray seedlings (20 grams) are used. Feed the chopped quail, fresh quail meat, small fish, shrimp and other bait, and the daily feed amount is about 5% of the fish's weight. In summer and autumn, water is added to the pond once a week for 30 minutes or more. In order to prevent fish diseases, the ponds must be disinfected with quicklime in front of the fish ponds, and the fish species should be soaked with 2% to 4% saline for 4 minutes to 5 minutes. During the period of breeding, every 10 days to 20 days, the whole pool is splashed with quicklime and strong chlorine and other drugs, and each kilogram of water can produce 500 kilograms of fish.
Second, polyculture in the net, ponds, etc. to raise the water of the 4 main fish, or the main raising of tilapia, crabs, crabs and other special aquatic ponds, per acre surface of the tail weight of 10 grams to 20 grams of Astragalus About 100 fish species. Without prejudice to the yield of the main breeding species, 10 kg to 15 kg of commercial stingrays with a tail weight of about 200 grams can be obtained per acre of water surface. Mixed polytrichum can not only reduce the number of small wild fish and shrimp competing for food with the main fish, but also increase the yield of the main breeding species, and can effectively control the parasitic diseases such as fish heads, fish heads, etc.
