It is quite common for river crabs to "go ashore" after releasing their seedlings, and customers often come to the store to consult this problem. In fact, there are many factors that affect the landing of Eriocheir sinensis seedlings. According to many years' technical service experience in Tangtou, the reasons and treatment measures that are easy to cause Eriocheir sinensis to land are summarized for your reference.

1, Qingtang drug residue

After the medicine is soaked in the pond, the treatment is not thorough and the residue is high, which will lead to the river crab landing. In particular, pyrethroids decompose slowly and remain for a long time, and are gradually released in the soil; Moreover, Eriocheir sinensis is extremely sensitive to these drugs, which will cause poisoning of Eriocheir sinensis and affect its physique and early survival rate. Treatment measures: minimize the use of highly toxic and residual drugs when cleaning the pond.

2. The pressure of seeding is high.

Crab seedlings will appear on the shore after long-distance transportation. The weather temperature difference is large, the temperature drops sharply and heats up, and the pressure on river crabs is high, which will lead to the situation of landing. Treatment measures: soak the seeds with "activation" and "life element" before releasing the seedlings; Severe temperature changes in the weather, splashing "activation" reduces the stress response of crab seedlings.

3. Hypoxia

In the early stage, the water level in the ring ditch was shallow and the water body was small. The Eriocheir sinensis seedlings were concentrated in the ring ditch, and the density in some areas was high. When the weather changes, it is easy to be partially deprived of oxygen, and the Chinese mitten crab will go ashore. Putting a large number of snails in some ponds will increase the oxygen consumption at night, leading to serious landing. Treatment measures: keep a reasonable water level; Reasonable placement of snails; Use "lipopeptide" to fertilize water, supplement nutrition and promote oxygen production by algae and aquatic plants; In the pond next to the snail, do "bottom oxygenation" in the ring ditch at night.

4. Lack of materials

The feeding amount of river crabs increased, but the feeding amount was insufficient, the water quality became turbid, and the activity of river crabs increased, and they went ashore one after another. Treatment measures: increase the feeding amount; In ponds with poor food, use "Bingxianbao" to mix chilled fresh fish to lure food. Add water to stimulate. When adding water, the water flow stimulates, causing the river crabs to gather, and the river crabs will land near the water inlet. Treatment measures: "clear water bank"+"activation" overflow, stabilize water quality and resist stress. "Old crabs", river crab seedlings are not strictly selected, and some "old crabs" appear ashore.