Cultivation method for green crab seedlings in pond

Abstract

The invention discloses a cultivation method for green crab seedlings in a pond. The cultivation method consists of seedling cultivating facilities and a seedling cultivating process and is characterized by comprising the following steps of: preparing a mud or sediment bottom seedling cultivating pond; arranging miropores for inflating and an aerator in the seedling cultivating pond; carrying out pond cleaning and sterilization on a water reservoir and the seedling cultivating pond before the seedling is cultivated; filtering inflowing water by using a bolting-cloth mesh bag with 120 meshes; directly incubating green crab larva in the seedling cultivating pond; starting all aerating facilities from the second day after the green crab larva are incubated; feeding the green crab larva with the following baits: feeding with wheel animalcule at the earlier stages of Z1 to Z3, preventing copepods from entering into a seedling cultivating water body at the stages of Z1 to Z2, feeding with the wheel animalcule and supplementing the feeding of the copepods with small specifications at the later stage of Z3, feeding with the copepods with small specifications at the stage of Z4 and feeding with the copepods at the stage of Z5; and gradually adding new water from the stage of Z3, wherein the water level at the initial stage of seedling cultivation is 70-80cm and the water quality indexes during seedling cultivation are that dissolved oxygen is not smaller than 5mg / L, the contents of ammonia and nitrogen are not greater than 0.4mg / L, the pH value is 7.8-8.5 and the salinity is 28-34.

Description

technical field [0001] The invention relates to a technology for cultivating seawater crabs in ponds. Background technique [0002] At present, there are two ways of cultivating seedlings of cultured crabs (portunus, river crab, blue crab) in industrial cultivation and pond cultivation. Among them, portunus and river crab have been popularized nationwide since they broke through the key technology of pond breeding in the early 21st century, and their seed production accounted for 70% and 90% of the total artificially produced seed respectively, which promoted the growth of the breeding industry of these two species. develop. Due to the influence of factors such as production conditions and rising seedling costs, the cultivation of blue crab seedlings is still dominated by industrial seedling cultivation. The seed production can only meet about 15% of the demand for breeding seedlings, and the breeding seedlings mainly rely on the natural environment in sea areas. Seedling....

AI Technical Summary

Problems solved by technology

[0008] The salient features of the present invention are that the production cost of the current blue crab seedling industrialized seedling raising method is high, the investment in seedling field infrastructure construction is large, and there is a large gap between the seed production scale and production volume and the actual demand of breeding production; the pond seedling raising method is due to the Cultivation from crab larvae to megalopa needs to be carried out under relatively high temperature conditions, and water quality control is difficult. Through the study of the feeding habits of mud crab larvae at different developmental stages and rotifers, copepods and other bait organisms in the nursery pond The research on the law of reproduction in the medium, integrates the breeding and growth of seedling pond bait organisms under high temperature conditions, species alternation and water quality control technology in seedling ponds, and replaces the traditional rotifer-Artemia nauplii bait combination with rotifer-copepod bait combination Seawater crab pond breeding method, under the condition of completely not using Artemia nauplii, the survival rate of mud crab daphnia to megalopa is more than 10%, the seedlings are lively and strong, and the megalopa to larvae The survival rate of metamorphosis is high, the cost of seedling cultivation is reduced by more than 50%, and the goal of not using Artemia nauplii in the breeding of blue crab pond seedlings is realized, which shows that the advantages of pond seedling breeding are significant