A kind of polyculture method of saury, river crab and freshwater shrimp
A technology of river crab and saury, which is applied in fish farming, application, climate change adaptation, etc. It can solve the problems that water bodies cannot be fully utilized, the survival rate of second-year-old saury is low, and the effective breeding area of ponds is wasted, so as to solve the problem of bait supply , high fecundity, and the effect of improving the survival rate of breeding
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Embodiment 1
[0023] Production technology steps include:
[0024] 1. Pond selection and preparation: Choose a pond with an area of 5-10 mu, with a flat bottom, complete water inlet and drainage facilities, and a rectangular east-west direction. After the pond was dried at the end of the previous year, the water at the bottom of the pond was pumped out to keep the bottom of the pond dry, and the silt at the bottom of the pond was removed to expose it to the sun. The pond used was disinfected in the same year, using quicklime 75- 100kg / mu; or 20-30ppm of bleaching powder into the water and sprinkle the whole pond, and the disinfection time is 20 days to 1 month before the seedlings are stocked; When the water inlet is filtered with a 60-mesh screen bag to prevent wild fish and harmful organisms from entering the pond, enter the water 50cm, and then apply the fermented organic fertilizer (such as cow dung, pig manure, etc.) at a rate of 75-100kg / mu. The amount of base fertilizer is applied...
Embodiment 2
[0030] Location: Polyculture was carried out in the three ponds No. 11, No. 12, and No. 13 of Xinghuo Branch of Fengxian Research Base of Shanghai Fisheries Research Institute. Crab species were stocked on February 4, 2017; a total of 17,500 crab species were stocked. 50 per catty; saury species were stocked on June 6, 2017, with a total of 2,700 species, and the average size of the species was 7.64g / tail; green shrimp species were stocked on May 6, 2017, and a total of 30 catties were stocked . Fishing of river crabs started in early November, 2017. After nine months of cultivation, 2,170.5 catties of crabs were harvested, and the average size of male and female crabs was 2.23 taels per crab; the saury was fished by pulling nets on November 30, 2017. After six months of breeding, the harvest was two 1,954 saury, with an average size of 30.8g / tail, (survival rates of 81.7%, 71%, and 64.3%); 28,888 self-propagating saury, with an average size of 7.62g / tail; 330 catties of freshw...
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