In recent years, the effectiveness of hairy crab breeding has been significantly higher than that of fish farming. Hairy crab breeding is still one of the most important farmed species in Anhui, Hubei, and other provinces in Jiangsu Province. The scale of farming is still large, and many aquaculture ponds have been converted into crabs and fish farming every year. Ponds to raise crabs should pay attention to the following points:
First, pay attention to the depth of silt the original fish pond mud is relatively deep and fat. The mud that is too deep and too fat is not good for fish farming. It is even more harmful to crab cultivation. It must be dredged and reconstructed. Only about 10 cm of plants are planted to ensure that the disease is removed, the water is fresh, and the aquatic plants can thrive. The cleared mud cannot be left on the slope of the pond like fish, but must be transported out of the pond completely to prevent the rain from rushing back to the pond, overwhelm the escape wall and cause muddy water.
Second, pay attention to the number of plants many years of fish ponds, most aquatic plants are not even grass, which is very unfavorable for crabs. As an important environmental factor for the growth of crabs, aquatic plants provide crabs with an indispensable place for inhabiting, feeding on, avoiding the enemy, hiding, and clam shells, as well as purifying water, providing crabs with other vitamins, crude fibers, and other substances that are lacking in food. Therefore, the original fish pond to change crabs in a timely manner several times, the appropriate amount (about 60% of the area of ​​the pond area around the pond), sparsely mixed transplantation of many groups and more varieties, such as: Black leaf algae, Elodea, Vallisneria, Juliu grass Waiting for plants is very important.
Third, pay attention to the pool of water seepage of water damage to fish is not large, whether it is infiltration or extravasation must pay great attention. For crabs, water seepage is not only a problem of losing water or adding "good water", but also the issue of crabs running away along the "waterway" and even causing empty ponds and "black pools" where crabs do not exist. Therefore, the original fish pond was changed to raise crabs, and during the pond clearing and during the normal hunting of ponds, it was necessary to pay close attention, and it was found that the water seepage area where the river crabs escaped was promptly and effectively confiscated and blocked.
Fourth, pay attention to the environment The crabs have a timid nature and there are strong changes in the external sounds. When people and animals approach, they will affect their normal habitat and foraging. Especially in the crab shell process, in the event of external interference, it will extend the time of the shell, affecting the constitution after the shell, in serious cases, the shell does not collapse, then caused death. Therefore, maintaining a quiet crab pond is a problem that must be taken seriously. The noisy environment of the original fish must be rectified.
5. Attention should be paid to predators and crawfish, which have little harm to the original fish, in fish ponds. Fish farmers do not pay much attention. But for crabs, mouse, crawfish and other predators are terrible: a rat can kill and eat at least 8 young crabs of 5 grams a day; a crawfish can attack 2 or 3 just for an hour. Shelled soft shell crab. Therefore, when the original culture of fish ponds is changed to raise crabs, it is necessary to thoroughly clear the ponds before restocking, to improve the reinforcement and escape prevention plates, and to drive the killing of mice, crayfish, birds, scutellaria and loach at any time to ensure good Crab raising environment.
6. Pay attention to the fact that most of the fish farming in Qingtang County advocate the use of quick-lime ponds, but the situation for crab rearing is quite different. Although quicklime can provide the calcium needed for crab shells, the pH of pond water is relatively high, such as the use of quick lime. The pond will inevitably increase the pH of the pool water again, which is not conducive to the larvae and feeding of young crabs. Therefore, the use of quick-lime ponds to change the culture of crabs must use bleached clear pond.
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