Parent selection and cultivation of Misgurnus anguillicaudatus

Parent fish source

The natural Misgurnus anguillicaudatus near the spawning period or the production units were collected to cultivate the individuals with obvious growth advantages to avoid inbreeding.

Parent fish requirement

Misgurnus anguillicaudatus matured at the first age and began to lay eggs. The mature female Loach has a round belly and smooth pectoral fins, and the individual is larger than the male Loach. The reproductive period of Misgurnus anguillicaudatus is generally from April to August. It is the peak spawning period from late May to late June when the water temperature is about 25 ℃. For parent fish used for breeding, in addition to being in good shape, strong physique, no disease, no injury, normal body color, etc., we should also pay attention to the following points:

1. Female Loach: the female Loach at the age of winter has reached sexual maturity, the large female Loach has a large number of eggs, and the breeding seedlings are of good quality and grow fast, so it is necessary to choose 2-3 winter age, body length more than 10 cm, preferably 15-20 cm; weight more than 18 grams, preferably 30-50 grams of pro-female Loach; the abdomen is dilated and soft and elastic, the body color is orange with luster, the abdomen is white, and the characteristics are obvious. The female Misgurnus anguillicaudatus has a large number of eggs.

2, male Loach: should also choose 2-3 winter age, body length more than 10 cm, preferably 15-20 cm; weight more than 12 grams, preferably 20-40 grams of pro-male Loach, agile individuals. The male Loach with large individual has more semen, and the fry are of good quality and grow fast.

Parent fish cultivation

1. Stocking density: the captured parent fish were put into the culture pond according to the ratio of female to male, and the stocking density was 6 groups / m2~l0 group / m2.

2. Feeding and management: aquatic plants are put into the pond and fed twice a day in autumn, mainly animal feed such as animal minced meat, minced offal, fish meal, supplemented by a small amount of plant feed such as wheat bran, bean dregs, rice bran, cakes, etc., and can also be fed with compound feed, the feeding amount is 3% and 5% of body weight. In winter and early spring, stop feeding and add some fermented pig manure as topdressing. Starting from late March, it is necessary to seize the heating season to carry out intensive cultivation and feed high-protein fodder. When the water temperature is 15-17 ℃, the animal protein content in the feed is controlled at about 18%, and the plant protein content is about 25%. When the water temperature is about 20 ℃, the animal protein content is increased to 20%, and the plant protein content is reduced to 20%. The daily bait is 5%-7% of the body weight of Loach. When the water temperature is about 25 ℃, the amount of animal protein increases to 30%, and the content of plant protein decreases to 10%. The daily bait is 6% and 8% of the body weight of Loach.

3. Water quality management: after selecting Misgurnus anguillicaudatus, male and female can be cultivated separately or mixed together. Special ponds should be set up in cultivation ponds, and cages or bamboo cages should not be used instead. Before cultivation, it can be soaked with 20 grams of potassium permanganate per cubic meter of water to kill pathogens, and the stocking amount should not exceed 200 kilograms per 667 meters (that is, 1 mu). In the process of parent Loach cultivation, fertilization should be strengthened, raw fertilizer must not be applied, and well-fermented mature fertilizer must be applied. The water level of the pool is not lower than that of 40cm, and fresh water is often replenished to regulate the water quality, so that the water quality is fat and cool, and the transparency should be maintained at 15cm. Keep the water neutral or slightly alkaline, the water color is yellowish brown or green brown.