Green culture of grass carp in forming pond is an ecological and healthy culture mode that follows the ecological habits of grass carp and the ecological characteristics of fish ponds. A "shape" ecological culture pond for grass carp was built. Ryegrass, millet grass and Sudan grass were planted on the flat beach and ridge of the pond as natural bait for grass carp, and a certain proportion of silver carp, bighead carp, black carp, crucian carp and yellow catfish were added.

First, the effect of energy saving and emission reduction:

In March every year, ryegrass or millet grass are planted on the ridges of the flat beach and the backwater pool, and then water is gradually added to the water depth of about 15cm, so that the grass on the flat beach is partially submerged and grass carp can graze freely on the flat beach. This can not only make grass carp eat fresh and delicious grass, but also effectively save manpower for harvesting and feeding grass. From June, Sudan grass was planted on the ridge of the pond, and the growth of Sudan grass was accelerated by applying base fertilizer. Three straws grew on Sudan grass, so that it could be harvested and fed to grass carp. Perennial ryegrass and millet grass only need to apply a small amount of organic phosphorus fertilizer without spraying pesticides, while Sudan grass only needs to spray a small amount of high-efficiency and low-toxicity drugs to control aphids. When ryegrass, millet grass grass and Sudan grass grow, no or less pesticides and fertilizers are applied, which not only saves the cost of pesticides and fertilizers, but also hardly causes environmental pollution.

In addition, the manure discharged by grass carp after eating green feed decomposes fertilizer and water through biological bacterial fertilizer, which becomes the natural bait for silver carp polyculture, thus improving the yield of silver carp.

Second, the economic benefits: ① This model greatly reduces the feed cost. Seed green converts solar energy into animal protein in situ through photosynthesis, and the cost of fish farming is 30% ~ 40% lower than that of conventional fish farming. ② Effectively save labor costs. Seed green fully absorbs and utilizes mineral nutrients from fish pond sludge, thus improving soil. At the same time, it is convenient to water and feed on the spot by planting grass on the ridge, and the labor cost is reduced. ③ It can improve the nutritional quality of grass carp. Grass carp bait is mainly green feed, and the cultured grass carp has beautiful appearance, good taste, rich nutrition and no pollution, which is widely favored by consumers. ④ Reduce the occurrence of fish diseases. Feeding grass carp with green feed is easy for grass carp to digest and absorb, which can reduce the occurrence of fatty liver, enteritis and other diseases of grass carp, thus reducing the investment in fishery drugs.

3. Ecological benefits: ① The feed in this model is mainly green feed, which reduces the feeding of artificial compound feed and the accumulation of nutrients such as nitrogen and phosphorus in water and sediment caused by feed use. ② No or less chemical fertilizers and pesticides are applied in the process of planting green, which is friendly to the ecological environment. (3) Planting herring reduces the occurrence of grass carp diseases, reduces the quantity and dosage of fishery drugs, and ensures the quality and safety of aquatic products.

The green grass carp culture mode in Xingchi is energy-saving and emission-reducing, which has high economic and ecological benefits and is worth popularizing and applying.