Greenhouse graded crayfish seed rearing method

Abstract

The invention relates to the field of healthy crayfish culturing, especially to a greenhouse graded crayfish seed rearing method, and belongs to the technical range of agriculture. The method comprises the steps including greenhouse preparation, crayfish seed throwing in, crayfish seed feeding and reinforced culturing. Artificially bred crayfish seeds in the uniform specification of 1cm are throwninto a soil pool in a greenhouse in October to November in the density of 150-200 thousands per mu, plankton in the water are cultivated, animal forages as surimi are added, food is abundant, the temperature of the greenhouse is proper, the benthophyte Hydrilla verticillata grows vigorously to provide sufficient shelters, a nanometer micropore aerator in the soil pool of the greenhouse is used cooperatively, dissolved oxygen in the water body is sufficient, and the crayfish seeds in 1cm can grow rapidly to about 3cm after 25-30 days of reinforced cultivation, the survival rate of the seeds reach more than 85%, and the survival rate of the crayfish seeds as well as the utilization rate of the 1cm crayfish seeds is improved greatly.

Description

technical field [0001] The patent of the invention relates to the field of crayfish healthy cultivation, belongs to the category of agricultural technology, and specifically relates to a method for graded cultivation of crayfish fry in greenhouses. Background technique [0002] There are two modes of traditional crayfish farming in my country. One is the mode of feeding shrimp seedlings, that is, the artificially bred 1cm shrimp seedlings are directly put into rice fields or ponds in October every year, and 20,000 to 30,000 crayfish are put in per mu, without graded cultivation in greenhouses stage. Affected by the gradual decrease in water temperature, it is difficult to cultivate natural food organisms such as phytoplankton and zooplankton in large water bodies such as rice fields and ponds. The low biomass leads to insufficient bait for shrimp larvae, and the growth of 1cm larvae is slow or even stagnant. At the same time, from November to December, the water temperature ...

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Problems solved by technology

Another mode is the stocking of broodstock, that is, from August to September every year, the broodstock is placed in rice fields or ponds at a ratio of 2:1 between male and female. The broodstock mates naturally, and the spawning and hatching of fertilized eggs are very asynchronous. , Shrimp seedlings are successively produced after 2 to 5 months, that is, from the end of October to the end of February of the next year, so the shrimp seedlings cannot be collected or cultivated in different stages

In addition to all the disadvantages of the model of feeding shrimp seedlings, this mode has a lower survival rate of 50%, and has more serious shortcomings such as uncontrollable number of seedlings and irregular size of shrimp seedlings caused by asynchronous emergence time.

[0003] The above two crayfish farming models do not carry out seed classification cultivation, the seedling survival rate is low, the growth rate is slow, the size is irregular, and the individual is small, which leads to the extension of the breeding cycle, the delay of the market time of commercial shrimp, the reduction of the breeding output and the increase of the breeding cost