(1) Make full use of water body
The body of water in reservoirs and ponds is a three-dimensional space, especially a pond. Most of them are small in area and shallow in depth. Generally, only the water layer area and the water bottom area are divided. According to the living habits of farmed fish, and according to their respective living habits, a reasonable proportion of fish species and the age of the fish are used to provide a lively scene of “a pond like a building and a layer of fish wandering†in the aquaculture water. Get full use.
(2) extensive use of bait
Freshwater fish baits include natural foods and artificial diets. The natural foods in water bodies are plankton, benthic animals, bottom algae and organic crumbs. Artificial feeds are animal feeds and plant feeds. In order to fully and rationally use the natural food in the water and increase the utilization rate of artificial feed, it is necessary to breed various food fish in the same water body at the same time so as to ensure that various types of feed resources can be used as various living habits. It is used to increase feed utilization, reduce costs, and increase production.
(3) Using fish symbiosis
The polyculture of freshwater fish can be based on grass carp. It also includes raising more than a dozen species of fish such as squid, white peony, flower squid, squid, tilapia, squid, and turtle, etc. These fish are mixed and fed in the same water body. In addition to certain feeds, food can also be obtained through "self-fertilization". Because of grass-fish farming, the rations fed are mainly forage grasses. Grass carp eats the remaining debris and settles to the bottom of the water, becoming bait for omnivorous fish such as squid and tilapia. Grass carp, carp and tilapia continue to excrete fecal matter, increasing the quality of water and promoting plankton. Breeding provides feed for salmon and trout. The salmon and trout feed on plankton, effectively preventing excessive water from the plankton due to excessive plankton and providing protection for the growth of grass carp. Astragalus membranaceus and soft-shelled turtles can loosen the sediment during the cultivation process, accelerate the decomposition of organic matter, and provide bait for fish.
(4) Save on breeding costs
Mixed ponds with adult fishes adopt different sizes and types of fish of different ages, which will not affect the growth of adult fishes, but also increase the source of fish species. This will solve the problem of fish seed supply to a certain extent and save the cost of seed purchase. Moreover, this breeding does not require additional fish ponds and management personnel, and saves provincial, provincial, and provincial costs.
(5) Good efficiency
In the case of polyculture of freshwater fish, not only the average annual fish production has increased significantly, but also the number of listed fresh fish species has increased significantly, and good economic and social benefits have been achieved.
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In Venlo Greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. the steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using 4 mm thick float glass.
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