Problems of water sources and fish ponds in rainbow trout farms

(1) the source rainbow trout must be raised in clear running water, and groundwater, river water, mountain stream water and sea water can all be used, but it requires abundant water quantity in the four seasons, suitable water temperature, sufficient dissolved oxygen, clean water quality and no pollution.

1. Water quality. When choosing trout culture sites, the naturally formed drop should be used as much as possible to increase the amount of dissolved oxygen, and the pH value of the water is generally required to be 6-8. two。 The water is warm. The suitable water temperature for raising rainbow trout is 7 ℃-20 ℃. The rainbow trout grows slowly below 7 ℃ and dies gradually after 25 ℃. 3. Amount of water. The scale of rainbow trout culture mainly depends on the amount of water supplied. The amount of water is generally based on the water capacity in the dry season. Under normal circumstances, a water flow of 0.1 cubic meters per second can produce 12-18 tons of commercial rainbow trout per year. (2) Fish ponds have certain requirements on the type, area, structure and arrangement of fish ponds for rainbow trout farms cultured in high-density running water ponds. 1. The type and size of the fish pond. Fish ponds can be divided into juvenile fish ponds, fish fingerling ponds, adult fish ponds and parent fish ponds. The area of all kinds of fish ponds should be determined according to the amount of water injected, topography and use. two。 The shape and arrangement of the fish pond. Cement or cement flake structure is better for juvenile fish ponds and fish fry ponds, and soil ponds or cement or stone structures can be used for adult fish ponds and parent fish ponds. Most of the fish ponds used by Heilongjiang Fisheries Research Institute are rectangular and waterway-shaped ponds. The length of the rectangular pond is generally 10 times the width, the juvenile pond is 1-2 meters wide, and the other ponds are 4-5 meters wide. For a flow of 10 kg per second, a fish pond of 50-100 square meters can be built. Fish ponds are generally arranged in parallel and in series. Fish ponds need to be thoroughly cleaned before breeding and sterilized with quicklime, bleach and so on. A connecting trough to prevent miscellaneous fish from entering and an anti-escape gate made of barbed wire should be installed at the water injection outlet, and foam plastic should be used between the gate and the gate frame to strictly prevent escape. 3. Reasonable proportion of the area of all kinds of fish ponds. For the rainbow trout color field from parent fish collecting eggs to cultivating edible fish, in order to meet the quantity requirements of raising fish in each stage according to the plan, the proportion of all kinds of fish pond area in the area must be reasonable. In view of the differences in water temperature in different places, the cycle of cultivating edible fish varies from two years to three years, and the required pond area is also different. 4. The intake and drainage system of the fish pond. The size of the inlet and outlet should be based on the water flow rate, the flow rate, the size of the fish pond and other factors, appropriate width is better, the sewage outlet should be set at the lowest place. Fish bars should be set up at all inlets and drains to prevent fish from escaping. The fish fence mesh should be determined according to the size of the fish.