Natural reproduction and semi-natural reproduction of loach

Complete natural reproduction

Complete natural reproduction, also known as trapping reproduction, is a method to artificially induce the spawning population of Loach and obtain fertilized eggs by using the natural resources of Loach. When using this method, first of all, in the spawning season, make use of the spawning habit of Loach, that is, like to lay eggs in the aquatic plants on the bank, select the secluded aquatic areas accordingly, and first apply 2 baskets of plant ash in the shallow water. Then, 0.6-0.8 kg of pig, cattle, sheep and other animal dung water is applied in the induction area, which can induce a large number of Loach to spawn and breed in the aquatic bushes in this area, but corresponding protection measures should be taken in this natural area. In order to prevent the invasion of frogs and other enemies, affecting the effect of reproduction. Artificial fish nests can also be used to collect fertilized eggs in natural waters and move them to specific containers to hatch, which can improve the hatching rate.

Semi-natural reproduction

Semi-natural reproduction is a method of allowing mature Loach to mate and lay eggs on their own under artificial conditions. This method requires the construction of spawning pools and hatching facilities, which should be sterilized and prepared before breeding. The female-to-male ratio of parent Loach: if the male Loach is larger, press 1. 5 or 1:2, and if the male Loach is only 10 cm long, the female-male ratio can be adjusted to 1:3-4 to increase the number of male Loach. There can be 7-10 groups per square meter. In order to ensure normal reproduction, the water temperature should be stable above 18 ℃. In the north, it can be carried out in the middle of May every year, in the waters on both sides of the Yangtze River in late April, and in the south at the end of March and early April every year. The fish nest is tied to a bamboo pole and suspended in the middle or four corners of the spawning pond to immerse it under the water. In addition, due to the poor viscosity of Loach eggs, attention should be paid to checking and cleaning the dirt deposited on the fish nest so as not to affect the adhesion effect of fertilized eggs.

Loach usually lays eggs in the morning on a sunny day and ends at about 10:00 in the morning. When the spawning is almost over, immediately move the nests with eggs to the hatching pond or other hatching facilities for hatching, and replace and supplement the new nests into the spawning pond to collect the eggs of the parent Loach that have not yet laid eggs. After the last batch of Loach lays eggs, it can be hatched in the spawning pond, but all the parent Loach in the spawning pond must be caught to prevent the parent Loach from swallowing the eggs on the fish nest and affecting the emergence rate.