Large-scale plankton such as cladocerans and copepods, as well as earthworms, aquatic insects, chironomid larvae, etc., are all high-quality bait that eel seedlings like to eat, especially waterworms, which are the best food for eel seedlings. Good opening bait. Feeding should be done at a fixed location, preferably on the shaded side of the pond. The daily management work of eel fry cultivation mainly focuses on the following aspects:

1. Control the water environment conditions

The eel fry cultivation requires fresh, fat, and Dissolved oxygen content is high. Change the water once every 6 to 7 days in spring and autumn, and once every 3 to 4 days in summer. The amount of water changed each time is 1/3 to 1/2 of the total volume of the pool water. When changing the water, adopt the principle of draining first and then filling. Water changes should be scheduled around evening time. The water depth is kept at about 10 cm, and the water temperature is kept at 25 to 30°C.

2. Strengthen management

Insist on patrolling the pool more than three times a day, do a good job in preventing escape and disease, remove dirt and debris in the pool in a timely manner, and keep the breeding pool clean and hygienic. When the weather turns from sunny to rainy, or from rain to bright, or becomes muggy, eel seedlings tend to stick their heads out of the water, and new water should be added in time to replenish oxygen. Do not feed rotten feed. When it is found that individual differentiation is large, they should be separated and nourished in time.

3. Strengthen disease prevention and control work

Check eel seedlings frequently and disinfect the water regularly. If eel seedlings are found to be moving or eating abnormally, corresponding measures should be taken promptly to clear the pond. of harmful organisms.

IV. Breeding Steps and Methods

When the body length of the eel seedlings is more than 30 mm, the first separation and rearing will begin. The method is: when the eel seedlings are feeding intensively, use a dense mesh to fish out the eel seedlings with strong body, strong ability to compete for food and activity, and move them into another breeding tank for cultivation. The density is reduced to 150 to 200 per square meter. The feed fed at this time is mainly earthworms, fly maggots, a small amount of wheat bran, rice, fruits, vegetable scraps, etc.

When the body length of the eel seedlings reaches 50 to 55 mm, the second time of subculture is carried out. The method is the same as the first time of subculture, and the stocking density is reduced to 100 to 120 per square meter. The main feeds at this stage are earthworms, fly larvae and other animal feeds, and some eel species feeds can also be fed.

Under careful breeding conditions, the body length of the eel seedlings can reach 150-250 mm and the weight can reach 5-10 grams. At this time, the pond can be divided into an eel pond for overwintering, or it can be overwintered in the original pond. Generally, when the water temperature drops to about 12°C, eels stop eating and burrow into the mud to survive the winter.