Seawater crab fry breeding device and breeding water self-circulation and self-purification method

Abstract

The invention discloses a seawater crab fry cultivation device and a self-circulation self-purification method of cultivation water. A water pumping filter pipe is fixed in a cultivation water tank of the cultivation device, the water pumping filter pipe is communicated with an inflation pipe and a water outlet pipe, a filter is communicated with the water outlet pipe, a rotifer water return pipe and a filter water outlet pipe, and the rotifer water return pipe is communicated with the cultivation water tank; a water return control valve and a drainage pipe with a drainage control valve are arranged on the rotifer water return pipe; the ultraviolet sterilizer is respectively communicated with a filter water outlet pipe and a sterilizer water outlet pipe, the sterilizer water outlet pipe is communicated with a biological purifier, and the biological purifier is communicated with the culture water tank through a purified water return pipe; and water level differences exist among the filter, the ultraviolet sterilizer and the biological purifier. The cultivation device has the functions of filtering, sterilizing, reducing toxic inorganic nitrogen compounds and controlling the density and nutrition of biological baits. According to the self-circulation and self-purification method for the cultivation water, the cultivation water can be purified, diseases can be prevented and treated, the bait density can be controlled, and the seedling quality and the seedling emergence amount per unit water body are improved.

Description

technical field [0001] The invention relates to the technical field of aquaculture, in particular to a seawater crab seed cultivation device and a self-circulation and self-purification method for cultivation water. Background technique [0002] In the process of cultivating marine aquatic animal seedlings, the key factors that determine whether the seedlings are successful or not mainly lie in disease control, biological bait feeding density control and quality control, and water quality control in the cultivation tank. [0003] Disease is a key factor affecting the survival rate and quality of seedlings. In recent years, serious vibrio disease, fungal disease and virus disease have appeared in the breeding of aquatic fry, especially crustacean fry, causing serious losses to both fry and aquaculture. Therefore, controlling the number of pathogenic microorganisms in the cultivation of aquatic seedlings is a key technical requirement. At present, the use of antibiotics and d...

AI Technical Summary

Problems solved by technology

Aquatic seed larvae have high requirements on water quality. In the seedling cultivation pool water environment, the excrement produced by the metabolism of larvae and biological bait, as well as the decomposition of organic matter such as residual bait and feces, will produce toxic inorganic substances such as nitrite and ammonia nitrogen. If the concentration exceeds a certain level, the larvae will have a stress response and even be poisoned to death; these toxic inorganic substances will also stimulate the proliferation of bacteria and increase the toxicity, thus greatly affecting the survival rate

Usually, it is mainly solved by draining part of the seawater or fresh water in the pool and adding clean new water. However, aquatic seed larvae have higher requirements for water quality stability, and it is not enough to replace a large amount of toxic inorganic substances. Often due to The drastic changes in the environment cause the stress response of the larvae, which leads to the decline of the larvae's resistance and the death of the disease

In the later stage of larvae cultivation, the organic matter in the cultivation pond will increase, and the rate of decomposition of toxic inorganic substances such as nitrite and ammonia nitrogen will increase, making it impossible to balance between increasing the amount of water exchange and maintaining stable water quality, which will affect the survival rate of larvae cultivation The improvement also affects the quality of the cultivated seedlings

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