What are the precautions for selecting wild eel fry

For farming @#@236@#@ to succeed, high-quality fry is the prerequisite. Therefore, when selecting high-quality wild eel fry, the following ten points should be noted.

1. The size of the eel fry should be appropriate. Generally, the artificial farming period is 5-6 months, and the weight gain multiple is 2-4 times. At the end of the year @#@136@#@, only individuals with a size of over 100 g can fetch a higher price. Therefore, fry stocked in April-May should weigh over 30 g.

2. Try to choose cage-caught fry. Yellow eel fry come from two sources: artificial breeding and natural capture. The number of artificially bred fry is currently very small, and the eel fry needed for artificial farming mainly come from natural capture. Capture methods in natural waters mainly include cage trapping, electric capture, needle fishing, drug capture, needle spearing, bamboo clamping and bare-hand capture, among which cage-caught fry have the highest survival rate. Therefore, when selecting wild eel fry, try to choose individuals caught by cage.

3. The quality of the fry should be good. Common varieties of yellow eel include: dark yellow large-spotted eel, which is plump, with a dark yellow body color, and brown large spots distributed on the back and both sides; the large spots connect from the front end to the rear end of the body on the back and both sides to form several spot lines. Earth-red large-spotted eel, with an earth-red body color, especially obvious on both sides. Light yellow fine-spotted eel, with a light yellow body color, and fine dense spots that are not obvious, with almost no spot lines. Blue-gray fine-spotted eel, with a blue-gray body color, and fine dot-like brown spots on the body, but no spot lines formed. Practice has proved that the first two kinds of yellow eel are the preferred varieties for artificial farming.

4. The eel fry should be free of diseases and insect pests. The four common diseases of eel fry are saprolegniasis, water mold disease, internal parasitic disease and enteritis disease. Eel fry suffering from the above diseases should be removed.

5. The body surface of the eel fry should be free of external injuries. Common symptoms include blood in the mouth, needle eye marks, scratched skin on the head, abraded skin on the abdomen and needle-spear marks on the body. If yellow eels are poured into a 3%-5% salt water solution, injured individuals will immediately jump up, and such yellow eels should also be eliminated.

6. The eel fry should be firm and strong. When holding a healthy yellow eel by hand, the eel body feels firm and has a relatively strong struggling and escaping force; yellow eels that feel soft and weak when held by hand, with the head and tail drooping, are unhealthy yellow eels and should also be eliminated.

7. The mucus of the eel fry should be normal. In yellow eels that are diseased, injured or poisoned, the mucus over the whole body or part of the body falls off or decreases, and there is no smooth feeling when held by hand, or the smooth feeling is not strong, or the mucus clearly falls off. Such yellow eels should also be eliminated.

8. The eel fry should be agile and sensitive. Pour the yellow eels into a porcelain basin containing shallow water. Healthy eels swim normally, and upon slight disturbance, the whole basin of yellow eels will suddenly be startled and shake, making a "swoosh, swoosh" sound in the water. Those inactive individuals that tend to surface or turn their bellies up should be removed.

9. The temporary holding time should be short. When purchasing fry from eel catchers, the temporary holding time should not exceed 3 days. It is best if the eel fry caught on the same day can be purchased and stocked on the same day.

10. It is not advisable to buy eel fry that have been resold too many times. For fry purchased for farming, it is best to go in person to the eel catchers to select them. It is not advisable to buy eel fry that have passed through multiple resale hands, otherwise the quality of the eel fry will be difficult to guarantee.