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Heterogenetic silver cod adult breeding
1. Fish-breeding pond feeding 80-120 tails of a silver-growth oysters with a size of 5-8 cents per acre in the fingerling pond, and the fish fry are fed at a regular density. After 5 months without increasing feed, The breeding, you can harvest 20-25 kilograms of alfalfa for each acre. 2. Adult fish ponds are reared in adult fish ponds, and 100-120 tails of a silver-horned silver cockroach with a size of 2 inches or more are placed per acre. After raising for 180 days, about 20 kilograms of silver trout can be harvested. The average weight is more than 150 g. . 3. In the main pond of the fish pond, the breeding of different breeding silver cockroaches is the main method. At the same time, a certain amount of seedlings such as cockroaches, cockroaches, grass carp, and group-head cockroaches are introduced. The secondary feed is fed every day, and the total amount of fish 5-7%, the general feed coefficient is 2.2. For example, in the Mufu summer 1500, 250 kg per mu is produced, and the tail weight is 150-250 g. In addition, 200 kg of farmed fish is produced per mu and the total output of fish is about 450 kg per mu. 4. Lake stocking Under the condition of small stocks of grasshoppers, oysters and other ground fish, for small-scale lakes of 4,000 to 5,000 mu, 50 or so crucian carp can be stocked for more than 2 inches per mu, and 10,000 kg can be obtained in that year. The output will be continuously put into use for three years. Within three years, more than 50,000 kilograms of heterotrophic silver cocoon will be obtained.