A method for controlling saprolegniasis during hatching period of sticky eggs of freshwater fish

Abstract

The invention discloses a composite liquid, a treatment liquid and a method for controlling saprolegniasis during the hatching period of viscous eggs of freshwater fish. The components of the composite liquid include tribendazole, diatomaceous earth, anhydrous sodium sulfate, ferrous sulfate, gall And anticaking agent, the treatment fluid components include compound fluid, magnesium silicate and sodium chloride. The steps of the method include: first putting the hatching tools into the compound liquid solution for soaking treatment, then pouring the fertilized eggs of freshwater fish into the treatment liquid until the fertilized eggs are in the form of dispersed particles, and then hatching in running water, adding the compound compound at intervals during the hatching. liquid. Compared with the prior art, the present invention achieves the goal of hatching through the selection of hatching water sources and hatching tools, a series of disinfection and impurity removal measures in the early stage, and the use of a special compound solution in the running water hatching process, as well as precise hatching parameter control. The effective suppression of saprolegniasis during the hatching period of sticky eggs of freshwater fish during the entire incubation process fundamentally solves the occurrence and spread of saprolegniasis and improves the breeding rate of freshwater fish.

Description

technical field [0001] The invention relates to the technical field of aquaculture, in particular to a composite liquid, a treatment liquid and a method for controlling saprolegniasis during the incubation period of viscous eggs of freshwater fish. Background technique [0002] Saprolegniasis, also known as white hair disease, water temperature is a very critical factor for the outbreak of saprolegniasis. Saprolegniasis spores grow fastest when the temperature is around 20°C, grow slowly when the temperature is lower than 15°C, and basically grow when the temperature is higher than 25°C. Stagnation. The sticky eggs of freshwater fish, such as carp, crucian carp, bream, bream, loach, etc., usually breed in early spring. The water temperature at this time is 15-25°C, which is the most suitable for the growth of saprolegnia spores. During the season of sudden temperature changes, it is easy to cause large fluctuations in air temperature and water temperature, so saprolegniasis...

AI Technical Summary

Problems solved by technology

Because the outer mycelium of Saprolegnia is very long (up to 5-10mm or even longer), it will cover the water flow of the surrounding eggs, thus causing the sheltered normally developed fertilized eggs to die due to hypoxia, and then Saprolegnia in these dead eggs It grows rapidly again, and grows more hairs to cover more normal fertilized eggs. Such a vicious cycle can cause all eggs to die, resulting in failure of hatching.

[0004] At present, the control methods for saprolegniasis in freshwater fish can only inhibit the growth of saprolegniasis, but cannot completely eliminate them.

Conventional control methods mainly carry out prevention and control from the three key factors of fish eggs, saprolegnia spore quantity and water quality conditions. Saprolegniasis outbreak still unavoidable