2. Water quality: Salmon itself lives in the sea. If fresh water is used for aquaculture, the cleanliness of fresh water should be ensured. Don't take water from some ponds or rivers at will, spread new cement on the salmon breeding place, and soak the pond with water for at least two months after it is dry. If the old cement pond is used, the inside of the pond should be disinfected with bactericide 7- 10 days before the fry are stocked, and the water depth of the pond should be about1-1.5m..
3. Density: The breeding density must not be too dense. A maximum of 50 salmon of 30-50g can be kept per cubic meter. Because the growth ability of the salmon is very strong, the weight of these 50 salmon can reach1-2kg after being reared for 5-6 months. If the breeding density is too dense, the nutrition of the salmon will be uneven and there will be food grabbing, so it is impossible to ensure that each fish has sufficient nutrition. Therefore, it is necessary to strictly control the breeding density, and fry can be released every year in spring and April.
4. Feed: It is best to domesticate and feed the feed with granulated feed. Roughage must contain nearly half of protein. If the water temperature is below 8 degrees, it needs to be fed at least twice a day, once in the morning and once in the afternoon. If the water temperature is between 8- 15, it should be fed at least once a day, once in the morning, once in the evening, but it should be noted that each salmon only needs to be 8 minutes full each time.
5. Water temperature: Most salmon are cold-water fish, so the requirements for water temperature are strict. The most suitable water temperature for salmon growth is 13- 15 degrees, but it needs to be controlled at 8 degrees for well water. During the breeding period, it is necessary to increase the temperature meter in the pool in the season when the temperature is low in spring and winter. Plastic bags can be covered on the scaffolding to raise the temperature of the pool water. When the temperature is high in summer, well water should be used frequently to change the water and reduce the temperature of the pool water.