The fishes of the genus Benthicidae are benthic omnivorous fishes. They are delicate, nutritious, and economically valuable. They are highly cultivated varieties with market potential. Stingray has strong adaptability, and its growth rate is slower than that of carps. However, it grows faster than the species itself. The breeding fry of that year can reach commercial specifications and the population yield is higher. Due to the current immature artificial breeding technology, large-scale artificial breeding has certain difficulties, so it is imperative to carry out polyculture. Polyculture stingrays in fish ponds have the following advantages: First, they can feed low-value, small-sized trash fish, fish residue baits, organic debris, and zooplankton in the pool, and increase the net production of fish ponds. The second is that the parasites such as oystercatchers in the feeding water of stingrays can reduce the occurrence of fish diseases. Third, on the basis of not affecting the output of the main cultivar, 5 kg to 20 kg of stingray per acre will be raised, and the increase in mu will be more than 100 yuan. The polyculture technology is introduced as follows:
application:
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First, adult fish ponds are mixed into fish ponds and polyculture stingrays. There are no strict requirements for the fish that the pond raises. Fish ponds that cultured four major fishes and fish ponds that feed primarily (such as salmon, tilapia, and freshwater whitefish) can be mixed with stingrays. The fish pond covers an area of ​​20 mu to 30 mu, with a water depth of 2 to 2.5 meters. The water source is abundant, the water quality is good, and water injection and drainage are convenient. In general, 40 to 50 tails of stingrays are placed in the mu, and the specifications are 3 cm/tail to 4 cm/tail, and 5 kg to 8 kg of stingrays can be increased in the mu.
Second, the pro-fish pond polyculture pro-fish pond polyculture can not only make full use of the broodstock pond water space, improve the utilization of broodstock, and stingray can take some of the pro-fish pond and broodstock to eat oxygen small wild fish. After the artificial breeding of broodstock is completed, 40 to 60 tails of astragalus are stocked per acre, and the specifications are 2 cm/tail to 3 cm/tail, and 6 kg to 10 kg of stingrays can be increased per mu.
Third, the crab pool pool mixed polyculture stingray, you can make full use of crab pond natural food resources. The area of ​​general crab pond is 30 mu to 50 mu. The water grass coverage is about 50%. After the crab species is stocked, 30 to 50 tails of yellow catfish are stocked in mu, and the size is 3 cm/tail to 5 cm/tail. Fish 5 kg to 10 kg.
4. There are more middle and low values ​​of miscellaneous wild fishes in the polyculture of the river channel, and mixed bait can save artificial diet. In general, 40 to 60 tails of stingrays are placed in the mu, and the specifications are 2 cm/tail to 4 cm/tail, and 6 kg to 12 kg of yellow sturgeon can be increased.
Fifth, the mixed large-surface water surface of mixed yellow-headed catfish, the high yield of the group, neither affect the yield of the main species, do not need to feed another. In general, 40 to 60 tails of stingrays are placed in Mu, and the specifications are 3 cm/tail to 4 cm/tail, and 8 kg to 15 kg of yellow sturgeon can be increased.
Regardless of the type of polyculture adopted, the following items must be observed in the management of aquaculture:
First, keep the water body with high dissolved oxygen. The stingray has a high requirement for water-soluble oxygen in the pool. Therefore, the polyculture requires fresh water and adequate dissolved oxygen. During the growing season, fresh water must be added at appropriate times. During the high-temperature season, it is necessary to constantly change the water, and it is better to keep microfluidic water.
Second, maintain a reasonable stocking density and stocking specifications. According to the water body diet biomass, the ratio of polyculture and the stocking size should be determined scientifically and reasonably. Generally, 30 to 60 tails of polyculture should be appropriate for the water body, and the stocking size should be 3 cm/tail to 4 cm/tail. If the density is too large and the specifications are too small, it will not reach the market specifications at the end of the year.
Third, the polyculture of stingrays in fish ponds is no longer suitable for the polyculture of other carnivorous fish. The culture ponds of freshwater giant shrimp and crayfish should not be mixed with stingrays.
Fourth, in the breeding process, if the size of the stingray is found to be too small, indicating that the natural food in the fish pond is not enough, it can be used to make up small trash fish, summer fish, or artificially prepared special yellow sturgeon bait. When feeding artificial bait, you should feed the main breed (in shallow water area) and feed yellow sturgeon (in deep water area). Stingrays have nocturnal habits, and feeding should be mainly night-time.
5. In the crab pond, polyculture stingrays, because river crabs and stingrays are ecologically located in the same water layer position, it is easy to cause the ecological position of the two to compete. Therefore, there must be enough natural food organisms in crab ponds, otherwise the feeding effect of yellow catfish will be affected. In front of the turtle, 300 to 400 kilograms of snails and some spawning squid and egg-bearing prawn can be placed in each area of ​​the crab pond to let them breed naturally for the crabs and stingrays to feed freely. 