CATDOLL : CATDOLL: How to treat Saprolegniasis

1. How to treat Saprolegniasis

1. Formalin 100~250ppm, stream bath for 1 hour. 2. Salt 1~1.5%, 20~30 minutes. 3. Malachite green (malachite gree) is prohibited for edible fish. 4. Antibiotic treatment is required in case of bacterial mixed infection. 5. Methylene blue 2ppm can achieve good results again the next day. There is no need to change the water in time, and the water color will become lighter after the drug decomposition. You can consider changing the water appropriately after 3 days. Preventive measures: ⑴ Prevention of fish saprolegniasis ① Remove excessive silt from the bottom of the pond and disinfect with 200mg/L quicklime or 20mg/L bleaching powder. ② Strengthen feeding management, improve fish resistance, and try to avoid fish injuries. ③ When the broodstock is injured during artificial breeding, 10% potassium permanganate aqueous solution can be applied to the wound. If the injury is serious, 50,000~100,000 units/kg of streptomycin should be injected intramuscularly or intraperitoneally. ⑵ Prevention of Saprolegniasis in Fish Eggs ① Strengthen parent fish cultivation, improve the fertilization rate of fish eggs, and choose sunny weather for breeding. ② Wash the fish nest and then boil it for disinfection (fish nests made of palm bark), or disinfect it with salt, bleaching powder and other drugs (fish nests made of polygrass, duckweed, etc.). ③ Clean and disinfect the spawning pool and hatching equipment. ④ Use water spraying for hatching to reduce the occurrence of Saprolegniasis. ⑤ Do not allow too many fish eggs to adhere to the fish nest, so as to avoid the fish eggs underneath being suffocated and dying due to lack of oxygen, and further endangering the healthy fish eggs after being infected with Saprolegnia.

2. Why are crabs sick this year? Many of them are soft-shelled.

The fattening period of crabs has not yet ended in early August this year, and the yellow roe is not yet mature and full, but it will be fully yellow in mid-September. Provided by Erli River Crab Breeding Base.

3. There are a lot of white spots in the water of the river crab pond, some are long and some are round. What are these?

If there are blue algae in the water plants of a pond, it is probably because the water plants have rotted, causing eutrophication of the water body. It is recommended to remove the rotten grass, change the water, and then adjust the water.

4. Why do crabs have white frost on their bodies?

That should be salt. The salty water seeps out from the surface of the crab and becomes white after drying.

5. The hairy crabs came ashore a lot a few days ago, but they suddenly stopped coming ashore recently. What's the reason? The water is a little turbid recently.

The answers to your questions are as follows:

Based on the symptoms you described, we cannot clearly determine the cause. There are three possible reasons why hairy crabs do not eat: first, the crabs are northern species; second, the water quality is poor and the dissolved oxygen content is low; third, the crabs themselves are infected with pests and diseases. It is generally not a big problem if hairy crabs do not come ashore. In addition, it is recommended that you contact the local aquatic technology promotion department for consultation.

The above suggestions are for reference only.