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What are the problems in the current Sanwa shuttle breeding?
From a nationwide perspective, the three-ported crabs are mainly polyculture, and there are also some semi-intensive forms of monoculture (most of which belong to the latter type). However, regardless of the form, the benefits are considered. As far as I know, it is the half-sharpness and the darkness. I even say that I have not earned much and have lost a lot. The main reasons for the analysis are as follows: 1. The rearing of ponds and other aquaculture facilities resulted in a low survival rate, which led to a low yield. With the rise of crab heat, many investors were attracted, but many of them were speculators. As a result, less basic investment can be spent, and it can be quite good. It can save the province. I ran a lot of crab farms. Many water levels were only about 1 meter, and the clear ponds were not complete. The ditches were not standardized and the drainage was poor. The reason is "I only contract for one year." Not to mention the addition of aerators, water quality monitoring equipment and equipment. 2. Crab seedlings are not uniform in size, and cultivation is difficult. Most of the current seedlings rely on natural seedlings. Seedlings last from the end of May to July-August (mostly in June), and crabs are grown to be 8-9. Month, but no matter what kind of form, the individual size of the seedlings from the natural sea area is very different, and some may even differ by more than ten times. As the crab is a cruel animal that grows out of shells and has strong meats, the individual size is already strong or weak, not to mention the dispersal of the shelling period, which naturally increases the chance of mutual food. 3. The cost of seedlings is high 4. Breeding technology is simple and management is backward. Scientific research units lack basic research for a variety of reasons and breeders lack professional training. 5, short breeding cycle, listing too concentrated, supply and demand imbalance. 6. The output of crabs in the natural sea area is uneven and the market price fluctuates too much.