Method for improving breeding survival rate of Portunus trituberculatus larvae in northern areas

Abstract

A method for improving the breeding survival rate of Portunus trituberculatus larvae in northern areas belongs to the field of aquaculture. The method includes parent selection and breeding and larva breeding. The technical characteristics of the method are: performing disinfection treatment on parent crabs after gonad of the parent crabs matures; strictly controlling the feeding amount of nauplius of rotifer and fairy shrimp during a larva breeding stage after nutrient enrichment; evenly spraying the whole pool with zeolite powder during a megalops larva stage; and using a Bdellovbrio type product and viable bacteria degraded substrate improver to improve the larvae breeding water environment. Compared with the conventional breeding methods, in the same breeding scale, the method can decrease the water changing volume by more than 70%, can reduce the fire coal cost by more than 60%, can reduce the input cost by more than 50% after using the microorganism preparation to replace disinfection medicines and antibiotics medicines, can improve the average survival rate of the II stage larvae by 2-3 times, is safe, environment-friendly, efficient in a larvae breeding process, and has high promotion value and wide application prospect.

Description

technical field [0001] The invention belongs to the field of aquaculture, and in particular relates to a method for improving the survival rate of Portunus trituberculatus seedlings in the northern region. Background technique [0002] Portunus trituberculatus (Portunus trituberculatus) is one of the important crab species in marine culture and multiplication in my country. Since Portunus trituberculatus seedlings were successfully raised in the 1980s, Shandong Province has gradually carried out the proliferation and release of Portunus trituberculatus. Especially since Shandong Province implemented fishery resource restoration in 2005, the release scale of Portunus trituberculatus in the Laizhou Bay of Bohai Sea has expanded year by year. Significant economic and social benefits have been achieved. There are two main ways to cultivate portunus seedlings: industrialization and pond breeding. With the pressure of economic development on the marine environment, the water qual...

AI Technical Summary

Problems solved by technology

There are two main ways to cultivate portunus seedlings: industrialization and pond breeding. With the pressure of economic development on the marine environment, the water quality of sea water is showing a trend of deteriorating, which will easily lead to the failure of seedling cultivation and affect the seedling market. supply

Indoor industrial seedling cultivation is generally carried out in March. At this time, the natural water temperature is low, and heating equipment is required to increase the water temperature for seedling cultivation. The entire seedling cultivation process consumes a lot of coal and electricity, and the cost of seedling cultivation is high; The use of aquatic drugs to prevent diseases during the breeding process is one of the important measures to increase the yield of seedlings. However, the toxic and side effects of fish drugs on the ecological environment cannot be ignored