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Brachymystax lenox egg hatching method capable of preventing saprolegniasis outbreak

A technology for saprolegniasis and leptospirosis, which is applied in the field of aquaculture, can solve the problems that saprolegniasis cannot be completely avoided, the economic loss of aquaculture industry, and the long incubation period, so as to prevent large-scale outbreaks of saprolegniasis and promote high promotion Application value, low cost effect

Active Publication Date: 2019-12-31
河北省海洋与水产科学研究院 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Throughout the year, almost all fish and eggs can be infected, and the spread is rapid, causing significant economic losses to the aquaculture industry
Lepidoptera is a typical cold-water fish. The most suitable hatching temperature for its eggs is 6-12°C, which is very suitable for the growth and reproduction of saprolegnia. In addition, the hatching period is long, generally about 20 days, so it is almost impossible to completely avoid it in actual production. The occurrence of saprolegniasis, at the same time, dead eggs are easy to stick to live eggs to form clumps, which will cause hypoxia in live eggs and promote the development of saprolegniasis
Therefore, once saprolegniasis occurs, it will cause immeasurable losses

Method used

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  • Brachymystax lenox egg hatching method capable of preventing saprolegniasis outbreak

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of method for hatching the lentil salmon ovum that prevents saprolegniasis outbreak, comprises the steps:

[0023] S1: Spread 2-3 layers of fertilized eggs in the hatching container, and hatch the salmon eggs with micro-flow water (flow rate 8-10L / min, water exchange rate 50-60% / h) and 6°C. , continuous aeration and oxygenation throughout the incubation period;

[0024] S2: From the second day of fertilization, use 100ml / m once a day 3 Disinfect the water body with formalin, suspend the running water for 1 hour during disinfection, and then resume the micro-flowing water;

[0025] S3: After saprolegniasis occurs, use 300ml / m 3 The formalin of the water body is disinfected 3 times a day, and the running water is suspended for 1 hour during disinfection, and then the micro-flowing water is resumed;

[0026] S4: When the hatching accumulated temperature reaches 100℃·h, manually remove dead eggs;

[0027] S5: After removing dead eggs, use 300ml / m once a day 3 Th...

Embodiment 2

[0029] A kind of method for hatching the lentil salmon ovum that prevents saprolegniasis outbreak, comprises the steps:

[0030] S1: Spread 2 to 3 layers of fertilized eggs in the incubation container, and hatch the salmon eggs with micro-flow water (flow rate of 8-10L / min, water exchange rate of 50-60% / h) and 10°C. , continuous aeration and oxygenation throughout the incubation period;

[0031] S2: From the second day of fertilization, use 150ml / m once a day 3 Disinfect the water body with formalin, suspend the running water for 1 hour during disinfection, and then resume the micro-flowing water;

[0032] S3: After saprolegniasis occurs, use 350ml / m 3 The formalin of the water body is disinfected 3 times a day, and the running water is suspended for 1 hour during disinfection, and then the micro-flowing water is resumed;

[0033] S4: When the hatching accumulated temperature reaches 100℃·h, manually remove dead eggs;

[0034] S5: After removing dead eggs, use 350ml / m once...

Embodiment 3

[0036] A kind of method for hatching the lentil salmon ovum that prevents saprolegniasis outbreak, comprises the steps:

[0037] S1: Spread 2-3 layers of fertilized eggs in the hatching container, and hatch the salmon eggs with micro-flow water (flow rate 8-10L / min, water exchange rate 50-60% / h) and 12°C. , continuous aeration and oxygenation throughout the incubation period;

[0038] S2: From the second day of fertilization, use 200ml / m once a day 3 Disinfect the water body with formalin, suspend the running water for 1 hour during disinfection, and then resume the micro-flowing water;

[0039] S3: After saprolegniasis occurs, use 400ml / m 3 The formalin of the water body is disinfected twice a day, and the running water is suspended for 1 hour during disinfection, and then the micro-flowing water is resumed;

[0040] S4: When the hatching accumulated temperature reaches 100℃·h, manually remove dead eggs;

[0041] S5: After removing dead eggs, use 400ml / m once a day 3 The...

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Abstract

The invention provides a brachymystax lenox egg hatching method capable of preventing saprolegniasis outbreak. At the early stage of brachymystax lenox egg hatching, low-concentration formalin is usedto inhibit water mould spore germination, and saprolegniasis is delayed; after saprolegniasis occurs, high-concentration formalin is used to quickly kill mycelia of water mould so as to control saprolegniasis spreading; at a stage non-sensitive to outside stimulation before autolysis of dead eggs and during brachymystax lenox embryo development, the dead eggs are timely removed manually, and outbreak of saprolegniasis caused by adhesion clustering of the dead eggs and live eggs is prevented; after the dead eggs are removed manually, saprolegniasis recurrence is prevented through high-concentration formalin. Through the method, large-area outbreak of saprolegniasis at the stage of brachymystax lenox egg hatching can be prevented effectively, average hatching rate can be increased to higherthan 92.6%; the method is simple, convenient and easy to implement, low in cost, suitable for being applied in large-scale breeding production and quite high in popularization and application value.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and in particular relates to a method for hatching salmon eggs to prevent the outbreak of saprolegniasis. Background technique [0002] Brachymystax lenok is a species of chordate, vertebrate subphylum, bony fish class, ray-finned subclass, salmoniformes, salmonidae, genus genus genus genus. Lepidoptera is one of the special fishes in the alpine regions of our country, and it is the only one in the world. Its meat tastes fat, its fat content is high (3.8%-7.7%), it is rich in nutrition, and its eggs are quite valuable. A valuable economic fish. In recent years, due to the destruction of the natural ecological environment and the interference of human factors, the number of resources of leptospirosis has decreased year by year, and it has been listed as a national second-class protected animal. Therefore, it is particularly important to vigorously carry out the protection, multiplication and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K61/10A01K61/13A01K61/17A01K63/04
CPCA01K63/042A01K61/10A01K61/13A01K61/17Y02A40/81
Inventor 高晓田赵春龙肖国华陈力张立坤妥志利葛京王旭旭徐建华
Owner 河北省海洋与水产科学研究院
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