Silver fish in the reservoir
Air Dried Sichuan Pepper,Rock Bottom Red Pepper,Rock Bottom Pepper Changhong Imp. & Exp. Co., Ltd. , http://www.ly-foods.com
The location of the site should be selected as far as possible from the distance from the shore, water depth of 2 meters, with a small reservoir of hard sediment or gravel sediments and insects and other biological rich Kuwan, and at the same time choose a number of launch sites for more Put in order to avoid failure due to improper delivery of one point. When the fertilized eggs reach their destination, the nylon bag containing the fertilized eggs is first placed in water. When the water temperature in the bag is basically the same as the temperature of the water in the reservoir (temperature difference is less than 3°C), the fertilized eggs are slowly Evenly dispersed into water, each input point should have a certain range. In the north, more ice eyes should be made and fish eggs should be thrown into the water directly from the ice eyes. The action of egg-laying is quick and avoid freezing eggs. If the soft bottom is thick, several ice eyes should be opened on the ice and the cage should be sunk first. Then the fertilized eggs should be dropped and the cage should be slowly lowered to a depth of 2 meters. Plastic floats are fixed. After the release of the fertilized eggs, the management of reservoirs that do not freeze, after the release of fish eggs, should be put under protection for one month for protection of the egg-laying farms. This is mainly due to the prohibition of water and underwater activities such as pulling and fishing in this area. Icing reservoirs, especially reservoirs that use cages to feed fish eggs, should be patrolled frequently at the ovulation site for a few days to prevent cages from being raised on the surface of the water and freezing eggs to cause damage. After half a month, break the ice and lift the cage up to the surface of the water. Use a brush to brush off the attachments on the cage. At the same time, a certain egg can be sucked out. After checking the development of the embryo and the survival rate, the cage is slowly submerged. The hatching time of fish eggs in the low temperature environment of ice at 1.5°C-5°C is 63-65 days, and the water temperature at the time of film emergence is 6°C-7°C. Incubation time is 30 days when the water temperature is between 2°C and 10°C. The number of days when the film was at a temperature of 11°C to 16.5°C was about 6 days (referring to the new whitebait in Taihu Lake). Transplantation Density and Replantation Large and medium-sized reservoirs (lakes) typically transplant 150 to 800 fertilized eggs per acre. After a transplant, the transplant should be repeated twice in the second year in order to increase the population and enhance the survival of the population. In addition, according to the biological characteristics and living habits of the whitebait, adult transplantation (difficulty) can be performed during the low temperature period. The time is generally from November to December, the water temperature is 10°C to 15°C, and the ratio of male to female is 3:1. When transported, it can be sealed with oxygen in a plastic bag. There are 50 bags per bag. The whole process cannot touch the fish by hand.