Loach breeding and seed breeding

Mudworms have strong adaptability to the environment, and they have a wide source of feed. They can be cultured in ponds, pit boxes, and paddy fields.
Loach is a small benthic economic fish that matures at the second instar and begins to spawn. The mature female has a large abdomen with a round pectoral fin, and the individual is larger than the male. Muddy reproductive period is generally from April to August, from late May to late June, when the water temperature is around 25°C, it is the peak of spawning. Loach spawned in batches. For the breeding of broodstock, to select the normal color, physical fitness, disease-free and injury-free, females should choose the body length of 15 cm or more, weight 30 grams or more abdominal enlargement of the individual, the male skeleton can be slightly smaller. Individual big females have large amounts of eggs, and there are more males and females. The quality of the fry is good and it grows quickly.
Loach natural breeding method is simple. After the spring, trim the fish pond, disinfect it with quicklime, and then inject new water. After the medicinal properties of the pool disappear, the broodstock will be placed in the pool at a ratio of 1:2 per male, and the area will be about 300 grams per square meter. When the temperature of the pool rises to about 20°C, a fish nest made of brown chips, willow roots, or aquatic plants must be placed in the pool. After the nests are laid, the sludge deposits should be checked and cleaned frequently to avoid spawning. Affects the adhesion of the egg granules. The loach likes to lay eggs in thunderstorm days or when the water temperature suddenly rises. Spawning starts early in the morning and ends at approximately 10:00 am. Spawning takes 20 to 30 minutes. At the time of spawning, the broodstock chased fiercely, and at the peak, the male slapped around the female's anterior abdominal position to complete the spawning and fertilization process. After spawning, fish nests in other pools with eggs sticking out are hatched. In order to prevent broodstock from swallowing eggs. At the same time, add a new fish nest and allow the unspawned broodstock to continue spawning. Spawning ponds should be protected from snakes, frogs and rats.
The artificial propagation method of the loach is the same as that of the domestic fish. The type and dosage of the oxytocin to be used are calculated according to each female's cockroach: 0.5 to 1 for the pituitary of the carp, 2 to 3 for the pituitary of the frog, and 100 to 150 for the chorionic gonadotropin International unit, or similar (LRH-A) 5 to 10 micrograms. Dove the dose by half. The solvent injection volume was 0.1 to 1.2 ml, and the syringe was injected using a 1 ml syringe and a 4 gauge needle. The injection site is between the abdominal line, pectoral fin pelvic fin, but also back muscle injection. Due to the muddy preference, wet gauze can be used for injection (exposing the injection site). After being injected into the spawning pool, the work thereafter is the same as natural breeding. Water temperature 20 °C ~ 25 °C, after 10 to 15 hours will be estrus spawning.
If artificial insemination is adopted, the male and female loaches that have been injected with the oxytocculum may be separately raised in small ponds or cages. When the water temperature is 18° C. to 25° C., after 10 to 15 hours, the eggs of the female abdomen are lightly pressed out of the abdomen. The dry method is used for artificial insemination. The method of operation and precautions are the same as those of home fish. Eggs are laid on the nest immediately after artificial insemination. The method is: Take a bucket of clear water and lay the fish nest flat on the bottom of the bucket. Then one person shakes the fish nest gently while stirring the water body. The other person slowly pours the eggs into the bucket to make the eggs evenly on the nest. Go to the nest and transfer to the hatchery for hatching.
Mud-fertilized eggs can normally hatch in the water temperature range of 20°C to 30°C. Generally, fry can be hatched in about 2 days. With a small container of still water, changing the water frequently (twice a day) has the best hatching effect. It is appropriate to incubate 400 to 600 grains per liter of water. Avoid shock when hatching. Incubation can be disinfected with a 0.1 ppm malachite green solution to prevent parasites.
The newly hatched seedlings are not free to move, because the head is attached to the fish nest or other objects, and the yolk is a nutrient. The fry hatched in the pond is generally kept in the original pond, the water depth is maintained at 20-30 cm, and the density per square meter is suitable for 500-1500 tails. When the density is too large, part of the fry should be removed and incubated in another pool.
The seedlings hatched for 3 days and started feeding. At this point, the cooked egg yolk or fishmeal suspension should be fed, several times a day, and the amount of feed should be within one hour. After 2 or 3 days, cast water fleas, rotifers, chopped silk cocoons or cocoons. After about 10 days of cultivation, the fry can be fed into the fingerling pond when it grows to 1 cm; the small density can be kept in the pond, and when the fry grows to about 3 cm in about a month, it is transferred to the fingerling pond. It can also be directly placed in paddy fields, ponds or pit boxes for adult rearing.
The area of ​​fingerling ponds is suitable for 30-50 square meters. Before the seeds are planted, they should be disinfected with clear ponds, and the base fertilizer should be used to cultivate food organisms. The amount of seed is about 30 grams per square meter (800 to 1,000 tails).
In the second half of the next month, the fish species is fed with powdered compound feed and is fed twice a day. The amount of fish is 3% to 5% of the fish's weight. In summer, the fish pond water has a high temperature, and it is necessary to pay attention to changes in water quality at any time and change new water frequently. When the fish grows to about 10 cm, it enters the adult fish rearing stage.

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