Method for increasing survival rate and growth rate of alosa sapidissima in breeding season

A technique of survival rate and growth rate is applied in the field of improving the survival rate and growth rate of shad in the breeding season, which can solve the problems of reducing the mortality rate of shad, uncontrollable disease condition, long duration, etc., and achieves prolonging feeding time, and the method is simple and reliable. , the effect of enhancing the positivity

Active Publication Date: 2016-08-17
SUZHOU FISHSEEDS BIOLOGICAL TECH CO LTD
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AI Technical Summary

Problems solved by technology

However, shad is a "scale-hungry fish" with an irritable temperament and vigorous swimming. During the breeding and spawning period, the male and female fish chase and collide with each other, causing scales to fall off or be injured by collisions, and then rot on the body surface or breed saprolegniasis, resulting in A large number of deaths (mortality rate of 20-30% or more); due to the intense pursuit of male and female fish, which lasts for a long time and consumes a lot of energy, after three months of breeding period, the weight of shad drops significantly, usually 30-50% weight
In order to reduce the mortality rate of shad during the breeding season, farmers usually use a lot of drugs, even illegal drugs, including antibiotics, etc., which cannot control the disease

Method used

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  • Method for increasing survival rate and growth rate of alosa sapidissima in breeding season

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Embodiment 1

[0019] A method for improving the survival rate and growth rate of shad in the breeding season, comprising the following steps: in autumn, adopt long photoperiod → in winter, adopt long photoperiod, warm water, brackish water culture mode → in spring, continue to adopt long photoperiod Periodic, warm water, brackish water aquaculture mode → In summer, use natural light and a freshwater aquaculture mode with higher water temperature.

[0020] The specific implementation process is as follows:

[0021] 1. Preparation of shad culture ponds: The fish ponds can be round or rectangular with rounded corners, with an area of ​​50-300 square meters and a water depth of 0.8-2.0 meters. Aeration or wheel aerators can be used to increase oxygen in fish ponds.

[0022] 2. Preparation of circulating water purification system: water purification can be divided into four parts, namely solid waste separation, aerobic nitrification, anaerobic nitrification and ultraviolet disinfection. The fi...

Embodiment 2

[0030] A method for improving the survival rate and growth rate of shad breeding season, the basic method is the same as in Example 1, and the difference from Example 1 is: the adjustment of the photoperiod, temperature and salinity during cultivation:

[0031] a. In autumn, adopt a long photoperiod: that is, the sunshine time is 18 hours, the light intensity is kept at 800lux, and the temperature is not lower than 22°C, and freshwater or brackish water farming mode can be used;

[0032] b. In winter, adopt long photoperiod, warm water, and brackish water aquaculture mode: that is, the sunshine time is 18 hours, the light intensity is kept at 800lux, the temperature is not lower than 15°C, and the salinity is 25‰;

[0033] c. In spring, continue to adopt the long photoperiod, warm water, and brackish water aquaculture mode: that is, the sunshine time is 18 hours, the light intensity is kept at 800lux, the temperature is not lower than 15°C, and the salinity is increased to 35‰;...

Embodiment 3

[0036] A method for improving the survival rate and growth rate of shad breeding season, the basic method is the same as in Example 1, and the difference from Example 1 is: the adjustment of the photoperiod, temperature and salinity during cultivation:

[0037]a. In autumn, adopt a long photoperiod: that is, the sunshine time is 15 hours, the light intensity is kept at 1900lux, the temperature is not lower than 20°C, and freshwater or brackish water farming mode can be used;

[0038] b. In winter, adopt a long photoperiod, warm water, and brackish water aquaculture mode: that is, the sunshine time is 15 hours, the light intensity is kept at 1900lux, the temperature is not lower than 16°C, and the salinity is 17‰;

[0039] c. In spring, continue to adopt the long photoperiod, warm water, and brackish water aquaculture mode: that is, the sunshine time is 15 hours, the light intensity is kept at 1900lux, the temperature is not lower than 16°C, and the salinity is increased to 25‰;...

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Abstract

The invention discloses a method for increasing the survival rate and the growth rate of alosa sapidissima in a breeding season. The rhythmic seasonal change of daily light period, temperature and salinity of a breeding environment is controlled according to an anti-ecological rhythm principle, the gonad development process is delayed or inhibited, bioenergy consumption of gonad development is reduced, sexual behavior of male alosa sapidissima is inhibited, injuries caused during sexual pursuit are reduced, and the survival rate of alosa sapidissima in the breeding period is increased. The method has the most remarkable effects that the survival rate of alosa sapidissima in the breeding period is remarkably increased, more importantly, the weight of alosa sapidissima is remarkably increased instead of being reduced as before in the breeding period lasting for three months and no drugs are required for treatment of injuries; the method is simple, reliable and low in cost and has a remarkable effect and wide application prospect.

Description

technical field [0001] The invention relates to the technical field of shad breeding, in particular to a method for improving the survival rate and growth rate of shad breeding season. Background technique [0002] American shad (Alosa sapidissima) was introduced from the United States to China in 2013 as a substitute species when the Yangtze shad, the "first of the three delicacies of the Yangtze River", was on the verge of extinction. It has formed a certain scale of farming in many southern provinces and cities in China. , and become one of the most valuable breeds in China. However, shad is a "scale-hungry fish" with an irritable temperament and vigorous swimming. During the breeding and spawning period, the male and female fish chase and collide with each other, causing scales to fall off or be injured by collisions, and then rot on the body surface or breed saprolegniasis, resulting in A large number of deaths (mortality rate of 20-30% or more); due to the intense pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K61/00
CPCA01K61/00Y02A40/81
Inventor 刘青华须藤直美
Owner SUZHOU FISHSEEDS BIOLOGICAL TECH CO LTD
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