Low-salinity outdoor enclosure type epinephelus seedling method

Abstract

The invention discloses a low-salinity outdoor enclosure type epinephelus seedling method. The method comprises the following steps: cleaning a pool and disinfecting; selecting a seedling pond, introducing seawater after the disinfection; culturing rich water: applying agricultural compound organic fertilizer into the water body of the seedling pond, and culturing the rich water until the transparency is 25-30cm; inoculating rotaria; preparing enclosures: arranging a plurality of enclosures in the seedling pool, and adjusting the salinity of independent water bodies in the enclosures to be 30 per mill-35 per mill; incubating fertilized ovums: incubating the fertilized ovums in the enclosures; opening the enclosures: opening the enclosures by a certain gap after fish fries are spawned for three days so that water flow inside and outside the enclosures is naturally exchanged, the salinity inside and outside the enclosures is balanced, and the fish fries can reach outside the enclosures by the gaps; inoculating copepoda; inoculating fairy shrimps; and finishing the seedling. According to the method, the enclosure type salting and incubating are conducted in the seedling pool, the incubating, the opening and the fish fry seedling are completed in the same pool, the operation procedures and the environment stress are reduced, so that the survival rate of the seedling is increased.

Description

technical field [0001] The invention relates to a method for cultivating fry, in particular to a method for cultivating grouper fish in low-salinity outdoor enclosures. Background technique [0002] Under natural conditions, groupers usually carry out fattening, maturation of gonads, spawning, fertilization, development of embryos, larvae, juveniles, and juveniles in the open sea, where the water quality is superior, and the salinity is high and stable, which is very conducive to fish early development. [0003] At present, although the grouper has achieved full artificial breeding of seedlings, the low success rate of seedlings has been plagued by the industry, and one of the most critical factors is salinity. Sea fish nursery is usually carried out near the shore. Due to the influence of rainfall and surface runoff, the salinity of the near shore is usually lower than that of the open sea. Especially from June to September, it is the breeding season of grouper, and it is...

AI Technical Summary

Problems solved by technology

However, this mode also has obvious defects: (1) multi-level pond transfer is labor-intensive, operation stress is strong, and fry loss is large; (2) there are differences in water temperature, salinity, water flow, etc. It is very easy to die due to stress response; (3) Seedlings in multi-level pools are exposed to fishing gear for multiple times, which is very easy to be infected with pathogens; (4) The cost of adding salt to the whole water body to increase salinity is high, and it is rarely used in production