Prevention and treatment method of saprolegniasis in incubation period of hucho bleekeri fertilized eggs

Abstract

The present invention discloses a prevention and treatment method of saprolegniasis in an incubation period of hucho bleekeri fertilized eggs. The method comprises the following steps: from the second day of incubation of the fertilized eggs, the fertilized eggs are soaked using running water containing formaldehyde every day; soaking liquid enters form the bottom of an incubator and is discharged out from the top of the incubator, a flow rate is controlled, so that the fertilized eggs do not roll over due to the excessive flow rate, the operation is continuously conducted for 30 min each time, and in the soaking process, the operation is conducted in dark place without vibration. After 30 min, normal incubation water is used to conduct running water incubation, and in the stages from the development of the fertilized eggs to early incubation (at an average incubation temperature of 7.5 DEG C and an accumulated temperature reaching 127 DEG C-170 DEG C), formaldehyde disinfection is stopped. Artificial methods are used to remove dead eggs until the fertilized eggs come out from membranes. The method is used to conduct the disinfection of the hucho bleekeri fertilized eggs, the incidence of the saprolegniasis can be reduced by 80% or more, and the deformity rate can be reduced to be 3% or below after emergence by using the method,.

Description

technical field [0001] The invention belongs to the field of aquaculture, and in particular relates to a method for preventing and treating saprolegniasis during hatching of Chuanshan Zheluo salmon eggs. Background technique [0002] Hucho bleekeri belongs to Salmo niformes, Salmonidae, Salmonidae, genus Hucho, formerly known as Hujia fish, Changjiang salmon, Bleekeri salmon, Bleekeri salmon, etc.; local common name : Cat fish, Hujia fish (Sichuan, Qinghai) and strip fish (Shaanxi), etc., belong to the large salmonids unique to the upper reaches of the Yangtze River, and are also the only large indigenous salmonids in the Qinghai-Tibet Plateau, and are national second-level aquatic species. As a wild protected animal, in the China Biodiversity Conservation Plan proposed in November 1992, Sichuan-Shaanxi salmon was included in the list of Class I fish priority protection species, ranking fourth after white sturgeon, Chinese sturgeon, and Dabry's sturgeon. In the "Red Data Bo...

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Problems solved by technology

[0006] In view of this, the present invention aims at the above-mentioned problems, and provides a method for preventing and treating saprolegniasis during the hatching of Chuanshan Zheluo salmon eggs. A phenomenon that occurs in a large area in a short period of time

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