Device and method for hatching fertilized eggs of sepia esculenta

Abstract

A device for hatching fertilized eggs of sepia esculenta comprises a nested hatching basket and a support rod. The nested hatching basket is provided with a bottom, the bottom is similar to a honeycomb and is provided with a central hole, the bottom similar to the honeycomb comprises a series of barrels, a circular hole is arranged at the bottom of each barrel, and the diameter of each circular hole is smaller than that of the corresponding barrel. By the aid of the device, fertilized eggs of the sepia esculenta are independently hatched in the nested hatching basket. As the diameter of each fertilized egg is larger than that of each barrel, the fertilized eggs cannot be clamped into the barrels, and later expansion of the fertilized eggs cannot be affected. Besides, by the aid of the circular holes at the barrel-shaped bottom, circulation and exchange of water can be ensured when the fertilized eggs are hatched, oxygen deficiency caused by squeezing of the fertilized eggs can be avoided, and saprolegniasis is effectively avoided. Hatched young sepia esculenta can immediately swim out by themselves from the side wall of the hatching basket, all egg shells fall into the barrels at the bottom of the hatching basket, the egg shells and fries are easily separated, the water in a nursery pond is kept clean, stimulation damage is effectively decreased in the fry cultivation process, and the hatching rate of the fertilized eggs is finally increased.

Description

technical field [0001] The invention belongs to the field of aquaculture, and in particular relates to a golden squid fertilized egg hatching device and a hatching method thereof. Background technique [0002] Golden squid is a newly developed breeding species, which has the characteristics of short life cycle (1 year), fast growth, large individual, rich nutrition, high availability, and obvious migration rules, etc. It has broad prospects for breeding. At present, the scale and scope of golden squid farming are gradually expanding. [0003] The newly produced eggs of golden squid have an average weight of 0.99g / grain (n=100), a long axis of 11-24mm, a short axis of 8-15mm, and a three-stage egg membrane. The tertiary egg membrane undergoes a process of softness-fixation-shrinkage-expansion during embryonic development. The fertilized eggs are hatched at a water temperature of 20-25°C, and after 25-30 days, the larvae are hatched one after another. Before the membrane is...

AI Technical Summary

Problems solved by technology

However, because a large amount of egg shells come off from the attachment base after the seedlings are hatched one after another, the fallen egg shells are mixed with the golden squid seedlings, which are very easy to spoil and breed bacteria. Living in habitat, most of the time is stationary, it is easy to cause inkjet damage to seedlings when removing egg shells, which in turn affects the survival rate of seedlings in the early stage of cultivation

There is no report on the special hatching device and hatching method for fertilized eggs of golden squid

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