Natural water fish farming is a place where water is abundant near mountain streams or reservoir irrigation channels. Fish ponds are built on the topography and high-density fish farming is conducted. Because of the higher dissolved oxygen in the water, good fish farming effects can be obtained. First, the choice of fish pond Natural flow of fish, there should be regular water throughout the year, the appropriate flow, preferably 0.5 cubic meters / second, the minimum drop of water into the aquarium to more than 1 meter. The water quality requirements are fresh and there is no pollution. The amount of dissolved oxygen in the water is above 7.0 mg/l, and the pH value can be allowed to be 8-9. If a flow water aquaculture pond is built near the irrigation canal below the reservoir dam, and the bottom water storage tank of the reservoir is used, it is better to go through the warming and aeration process of the 500-1000 meters open channel. Second, the construction of fish ponds No matter what type of running water aquaculture ponds, the specific requirements for construction are: the pool depth is generally 1.5-2.5 meters; the pool surface is more than 1 meter wide; the pool wall is solid and there is no leakage; Barriers to drains should be well-arranged. Generally, two layers are provided to remove grass residues and prevent fish from being caught. The pool shape is often better with round or oblong shapes, and water injection in the pool is as far as possible to prevent dead angles. Third, fish restocking targets in the flow of water under the environmental conditions, artificial feeding mainly food. The target of stream aquaculture should be mainly food-eating fish, such as grass carp, carp, carp, carp, tilapia and other high-quality fish, and the proportion should be more than 80%; the ratio of feeding and feeding carp and carp should be set. Control within 10%-20%. Fourth, feed sources and feeding methods General farmers, in the empty flat space behind the house before the house or courtyard in the small flow of water aquaculture pond feed concentrate, you can cake, rice bran, wheat bran based; also available Rice and corn are fed after germination; cooked sweet potatoes are also a good feed for fish. The daily feeding amount can be 5% -10% of the total fish weight in the pool. The fish farmer can also use the fresh and young grasses (mainly grasses) to feed grasses and squid. Conditional farmers can feed compound feed, and the fish can grow faster and bigger. The mix should be 3%-5% of the total weight of the fish. Feeding grass should take a hay rack, and feed must be equipped with a feed station to prevent feed from being washed away by running water. The daily feeding amount of feed is based on the degree of end of the day.
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