Fish and crab hybrid breeding pond and breeding method thereof

Abstract

The invention discloses a fish and crab hybrid breeding pond and a breeding method thereof. The breeding method includes that the breeding pond is divided into a fish breeding section and a crab breeding section, the crab breeding section is located in the middle, the fish breeding section is arranged on the periphery of the crab breeding section, and a separation net is arranged between the fish breeding section and the crab breeding section; water is led into the breeding pond, the water depth of the fish breeding section is not lower than 130cm while the water depth of the crab breeding section is not lower than 50cm, and vegetarian fish species and crab species are respectively thrown into the fish breeding section and the crab breeding section. Since fish and crabs are bred in the same environment, resource utilization of nitrogen and phosphorus pollution generated from fish breeding and excessive dissolved oxygen and water plants generated from crab breeding can be realized, and fish and crab hybrid breeding can be achieved.

Description

technical field [0001] The invention relates to an aquaculture pond, in particular to a culture pond for mixed cultivation of fish and crabs and a method for cultivating fish and crabs using the pond. Background technique [0002] In recent years, the quality of freshwater in my country has been deteriorating. Investigation and research on Taihu Lake by Shen Qirong and others from Nanjing Agricultural University showed that in terms of the source of eutrophication substances in the water body, the contribution rate of nutrients flowing into Taihu Lake from farmland accounted for 20%, from aquatic products and livestock and poultry breeding accounted for 40%, and from urban domestic sewage and sludge It accounts for 20%~30%, and other sources account for 10%~20%. It shows that the self-water pollution caused by aquaculture should not be underestimated. [0003] In order to control breeding pollution, a series of measures have been taken from the state to the local level. T...

AI Technical Summary

Problems solved by technology

But for crab (mitten crab, also known as river crab, crab) ponds, due to the low stocking density, the output of river crab in high-yield ponds is only about 100kg, and a large number of aquatic plants need to be planted in the pond as a shelter for crabs to shell. The amount of oxygen produced by photosynthesis far exceeds the oxygen consumption of crabs, resulting in the oversaturation of dissolved oxygen in the pond, especially in the afternoon on sunny days, when the dissolved oxygen can reach more than 15mg / L

At the same time, photosynthesis consumes CO2, raising the pH to above 9.5. Such a high dissolved oxygen and pH are not conducive to the growth and health of river crabs, and have a certain negative effect on the body color of crabs.

At the same time, aquatic plants have a competitive inhibitory effect on microalgae, and the clear water quality of the crab pond makes it impossible for river crabs to obtain enough natural bait, so that they cannot obtain astaxanthin, which is contained in many microalgae, which cannot be synthesized by itself. Nutrients Related to Body Color and Health

In addition, the overgrown aquatic plants in the crab ponds also need to be removed, and the salvaged aquatic plants are often thrown on the shore to cause secondary pollution

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