For broodstock breeding, broodstock can be picked directly from rivers, lakes, reservoirs, ponds and other bodies of water. This is a common method for artificial breeding of stingrays by current breeding units. If conditions permit, broodstock can be cultivated by oneself and then Choose. If the broodstock were to be caught from rivers, lakes, outboards, reservoirs, and ponds, attention should be paid to the following: Specific requirements 1. Fishery should be determined during the autumn and winter seasons. At this time, the water temperature is low, which is conducive to selection and operation. It is particularly easy to transport broodstock. , And low oxygen consumption. 2 The nets used for catching broodstock should be soft and smooth (usually made of vinylonite as the net). Care should be taken when picking stingrays from the gill net to avoid injury to the fish body. Rate, ovulation. (3) Artificial propagation When stingrays and stingrays caught in rivers are used as parents for breeding, they are cultivated separately. This will be conducive to the cultivation of broodstock, reduce the cost of cultivation, to achieve the purpose of high reproduction rate. (1) Selection of broodstock The stingray used for broodstock breeding should be strictly selected. It should be pure, individual, robust, disease-free, with complete fins. The female weighs more than 75 grams and the male weighs at i00. More than grams, into a special culture. If broodstock caught in rivers, lakes, wandering dams or reservoirs in early spring have reached sexual maturity, they can be reared in a special pool and directly used for breeding. (2) Transportation of broodstock The standard requirements for the transportation of stingrays and conventional fish are very high. For stingray size, broodstock should not be transported long distances. Because of the hard spines on the pectoral and dorsal fins of the stingray, the large volume and long transportation time make it easy for the fish to stab each other. If nylon bag is used for oxygen transport, it is easy to pierce the nylon bag and cause serious transportation errors. Therefore, when transporting broodstock of stingrays, a detailed transportation plan should be established. Transport personnel should be responsible for ensuring the survival rate of broodstock. (3) The method of transporting stingrays includes live watercraft transport and live waterwheel transport. Live water vehicles should be equipped with direct oxygen supply equipment and equipped with dual sets of oxygen supply equipment. To prevent damage to the oxygen supply equipment during transportation, causing serious damage. At the same time, a cloth bag made of rubber and plastic cloth was prepared on the transporting water tanker so that the broodstock would be less damaged. In the developed areas of the water network, it is the most effective method to choose to use a live water craft. It has the characteristics of large transport volume, convenient transportation, etc. However, during transport, attention should be paid to the water intake of the moving water tank to ensure the dissolved oxygen of the water body. We must also guard against contaminated water quality in the flow of water along the way to ensure the best results for transporting broodstock.
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