Method for cultivating larvae of loligo duvaucelii

Abstract

The invention discloses a method for cultivating larvae of loligo duvaucelii, and belongs to the field of aquaculture. The method comprises the steps that fertilized eggs of the loligo duvaucelii are hatched in a screen basin, the larvae enter a larva breeding pond after being hatched, and the breeding density is 800-1000 larvae / m<3>; 1-6 days after the fertilized eggs are hatched, 10 cm of new water is added every day, the water level is increased to 1 m from 40 cm, water is started to be changed when the larvae are 7 days old, the water exchange amount is gradually increased to 200% from 40%, and micro inflation is carried out; after the larvae are 30 days old, running water cultivation is carried out, the water changing amount is increased to 300% or above, and the inflation amount is increased; the water temperature is 20-26 DEG C, the daily temperature difference is smaller than 1 DEG C, the pH is 7.8-8.2, the salinity is 28-32, the dissolved oxygen content is 6 mg / L or above, and when the larvae are 60-70 days old and have the mantle length of 2-2.5 cm, the larvae can be sold; the bait used after the young loligo duvaucelii is hatched is banded grouper roe-artemia nauplii or cladocerans-opossum shrimps or young penaeus vannamei which are wrapped by 4 / 5 of embryo bodies. According to the method, the larva breeding survival rate reaches 60%.

Description

technical field [0001] The invention relates to a method for cultivating dolman squid seedlings, which belongs to the technical field of aquaculture. Background technique [0002] Loligo duvaucelii, synonym Loligo oshimai, also known as small tube, Oshima's lock tube, shallow water squid, belongs to Mollusa, class Cephalopoda, gun-shaped Order (Teuthoidea), Loliginidae (Loliginidae), Lotiginidae (Lotiginidae), distributed in the South China Sea and Malay Archipelago waters. Small-tube squid is one of the economic species in my country's offshore squid family. It has a dense population and lays hundreds of tons of eggs every year. It has development potential. Among them, the small tube in Dongshan Island, Zhangzhou, Fujian is the most famous, with crisp taste, delicate and tender meat, etc. It is a special seafood that tourists from all over the world must eat when they come to Dongshan Island. However, in recent years, due to the large-scale fishing of broodstock, the reso...

AI Technical Summary

Problems solved by technology

However, it was found in the breeding and production that the breeding technology of Dunaliella squid is different from the existing cuttlefish and octopus, and the breeding is extremely difficult. For example, the opening bait of squid and octopus is generally Artemia or mysis, but due to the The newly hatched cuttlefish are small, the artemia or mysis shrimp are too large, and the small rotifers from a wide range of sources cannot meet the nutritional needs of calamari. In addition, because the rotifers are round, it is not conducive to Therefore, the existing bait is not suitable for the pre-cultivation of Dolmani squid seedlings; in addition, because Dolmani squid swims fast, the inner shell is thin, and the rear end of the inner shell is extremely sharp, it is easy to collide with the pool. The wall of the squid caused the tail to fester and the rear end of the inner shell to be broken and died, which made the survival rate of the seedlings low. Therefore, it is necessary to set up special cultivation conditions to prevent the damage caused by the collision with the wall. Reports on Breeding Techniques