A method for constructing a new strain of salmon trout resistant to saprolegniasis

A construction method and technology for saprolegnia, which are applied in the field of construction of new disease-resistant strains of salmon and trout, can solve problems such as the quality of salmon and trout and the impact on use safety, so as to avoid damage to the quality of commercial fish, improve the quality of aquatic products, and improve genetics. good stability

Inactive Publication Date: 2020-04-21
HEILONGJIANG RIVER FISHERY RES INST CHINESE ACADEMY OF FISHERIES SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the occurrence of saprolegniasis, a large number of disinfectants or antibacterial drugs are currently used in salmon and trout farming, which has a serious impact on the quality and safety of salmon and trout

Method used

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  • A method for constructing a new strain of salmon trout resistant to saprolegniasis

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specific Embodiment approach 1

[0016] Specific embodiment one: present embodiment salmon trout saprolegniasis new strain is constructed according to the following steps:

[0017] 1. Enter the breeding season, select individuals with severe saprolegniasis infection in sexually mature populations of salmon trout, and establish a basic population for breeding;

[0018] 2. Continue to raise and select the basic group to sexual maturity and use the nest mating design method to establish N families, and the fertilized eggs are cultivated separately according to different families;

[0019] 3. Continue to raise the broodstock and fertilized eggs after breeding, and count the death situation. When the mortality rate of the broodstock reaches 60%, eliminate the fertilized eggs of the family corresponding to the dead broodstock, and cultivate the fertilized eggs of the remaining families;

[0020] Four, rearing the fertilized eggs obtained in the previous step until the larvae ruptured the membranes and floated up, t...

specific Embodiment approach 2

[0025] Specific embodiment two: the difference between this embodiment and specific embodiment one is: salmon and trout are infected with saprolegniasis due to dragging nets, induced labor, scratching or the way salmon and trout collide with each other. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0026] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: N≥30. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a new water mildew-resistant salmon trout construction method, and relates to a new disease-resistant salmon trout construction method. The method can be used to reduce salmon trout loss caused by water mildew without using a lot of disinfectant or antibiosis medicament, thereby raising salmon trout quality. The method comprises the steps of 1 establishing a basic seed selection group; 2 establishing family systems in the number of N; 3 weeding out; 4 secondary water mildew infection; 5 breeding to establish filial generation family systems in the number of M; and 6 repeating steps 1 to 5 until water mildew-resistant property is stable. According to the invention, beneficial colony heredity variation is utilized, and new disease-resistant species or lines are cultivated through fertile breeding; the new species has good heredity of disease resistance is stable; the appearance of the fish as a goods is prevented from being damaged due to water mildew; and mortality caused by water mildew is reduced to 30% below.

Description

technical field [0001] The invention relates to a method for constructing new disease-resistant strains of salmon and trout. Background technique [0002] Saprolegniasis, also known as cotton-covered disease, water cotton disease, skin mildew or white hair disease, is widely found in freshwater or brackish waters and moist soils all over the world, and saprophytes on dead organic matter. Common mold. [0003] Saprolegniasis is a common disease in the production of salmon and trout. It is mainly caused by pulling nets, induced labor, scratching in cement pools, or self-mutilation of a few ferocious species, etc., which cause body surface tissue injuries, which in turn leads to the adhesion of saprolegnia zoospores in the water body The necrotic tissue germinates to form hyphae, and gradually spreads and invades nearby normal tissues, secretes digestive enzymes to decompose surrounding tissues, and then penetrates deep into the muscles. Eventually the superficial hyphae exte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01K61/10
CPCA01K61/00Y02A40/81
Inventor 张玉勇白庆利贾智英
Owner HEILONGJIANG RIVER FISHERY RES INST CHINESE ACADEMY OF FISHERIES SCI
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