Artificial fattening of Monopterus Albus and breeding of Eel seedlings

The method of artificial fattening ricefield eel:

Monopterus Albus culture ponds should be built in places with shelter from the wind and the sun, guaranteed water sources and solid soil, such as cement ponds, soil ponds and rice fields. The area of the pond for raising Monopterus Albus is determined according to the scale of the culture. Generally, it is appropriate to have a pool of 100 square meters, with a depth of 70 cm and a wall of about 30 cm above the water surface, to prevent Monopterus Albus from escaping.

The shape of the pond is long and oval, the pond is made of bricks around, the top of the pond wall is made of "t" shaped eaves of about 20 centimeters, the bottom of the pond is paved with cement, and the pond mud of about 25 centimeters is laid on top, so as to facilitate the burrowing of Monopterus Albus. The cement in the pool should not be too deep, it is best to keep it at about 15cm. Drainage holes should be set up to prevent escape from low-lying pools and old nylon nets. Water hyacinth and other aquatic plants are planted on the surface of the pond, which are used as shade and latent habitat of Monopterus Albus. The seedlings had better come from fine dark yellow spotted eel cultivated and domesticated. Eel seedlings are mainly wild, with no damage, no parasites, strong physique and uniform size, 80 eels per kilogram and about 1 kilogram of yellow eel seedlings per square meter. The stocking density of eel seedlings with a specification of 20 Mel / kg was 4 kg / m2, and that of eel seedlings with a specification of 10 mi / kg was 4 Mel / 6 kg / m2. Eel seedlings of different specifications should be raised in separate ponds, while 10% of the eel seedlings should be matched with a small amount of Loach. Feeding and management.

1. Feed: Monopterus Albus feed can be earthworm, mussel meat, snail lion meat, small mixed fish, small tadpoles, small insects, animal viscera, melons and vegetables and so on. Monopterus Albus is usually fed after dark in the afternoon within a week after release, then gradually advanced feeding time, domesticated to the most complete at 2: 00 p.m.; the fresh bait feeding rate is 5% Mak 6%, and the bait feeding rate is 1% Mel 2%. According to the water temperature, the animal feed should be fresh.

2. Daily management: the main purpose is to keep the water quality "fat, alive, tender and cool". When the seedlings are first released, the water in the pool should be shallower, 10 centimeters is appropriate, and then gradually deepen the water, generally maintained at 15 Murray 20 centimeters. The water should be changed frequently, every 3 days, and it is appropriate to change the water every time. When there is a high temperature in summer, change the water once a day, preferably in the early morning, when the temperature of the water source is basically the same as that of the pool water, so as to prevent the rice field eel from catching a cold because the temperature difference is too large (more than 3 degrees). Catch dead eel, sick eel and weak eel in time every morning, and plant towel gourd, grapes and other vines along the pool to cool down.

New fish are selected for breeding, the female should choose the eel with a body length of more than 35 cm and weighing 50 won 150 grams, with Zona pellucida and red and swollen reproductive pores, and those with eggs are the best; the male eel should be more than 55 cm long and weigh more than 150 grams, with blood markings on the abdomen, extruding the abdomen can flow out hyaline, and microscopic examination shows sperm. It is suitable to match 2 Mel 3 female eels with 1 male eel.

Measures such as inflating, increasing water exchange, adjusting culture density and providing high quality bait can be adopted to promote the reproduction of eel naturally and improve its fecundity. Lrh-a can also be injected once, 10 micrograms per 50 g body weight for female eels and 15 Mel 25 mg per tail for male eels. Male eels were injected into the chest 24 hours earlier than females. When injecting, the depth is not more than 0.5 cm, the injection volume is not more than 1 ml, the effect of inducing labor is the best.

Artificial insemination holds the front of the female eel with a towel in one hand and squeezes the abdomen backward with the other. If the cloaca is blocked, the cloaca can be cut open, and then the eggs can be squeezed, and the extruded eggs can be put into a sterilized jar or basin. Kill the selected male eel, cut and grind the testis, wrap the chopped testis with a 100-mesh sieve, squeeze the semen into the egg container, stir fully for 5 minutes, wash off the seminal remnants and blood stains with clean water, and put the fertilized eggs into a temperature-controlled incubator or indoor incubator to hatch. No matter the number of eggs, at least 2 or more male eels should be used to inseminate.

The water depth of controlled temperature hatching should be about 10 cm, and the water should be changed frequently during the process, but the temperature difference should not exceed 4 ℃. The higher the water temperature, the shorter the incubation time.

Cement ponds should be used for fish fry cultivation, in which a small amount of manure fertilizer and water should be properly applied to provide silk earthworms for reproduction, and water hyacinth and other aquatic plants should be released on the water surface. The stocking density of fish fry is about 200 fish fry per square meter. After 2 months, eel fry can be moved to adult eel pond when they grow to about 10 cm.