Technology for actualizing inverse season hybridization breeding of java tilapia in greenhouse constructed in winter

Abstract

The invention discloses a technology for actualizing the inverse season hybridization fry breeding of java tilapia in a greenhouse constructed in winter, which belongs to the aquiculture industry. Theinvention is realized according to the biological characteristics that the sexual gland of the parent fish of the java tilapia which only eats baits at the water temperature below 23 DEG C can not develop, and the sexual gland begins to develop when the water temperature reaches 23 DEG C and is stabilized at more than 23 DEG C so as to lay eggs and hatch fries. The characteristic that the temperature of the greenhouse of a fish pond in winter can be increased and preserved at more than 23 DEG C is utilized. The heat-insulating property of the greenhouse is good and can reach the physiologicalrequirement of the growth and development of the java tilapia. Along with the raise of temperature at the beginning of spring, the water temperature in the greenhouse is raised more quickly and is stabilized at more than 23 DEG C. Therefore, the pure bred fries of the java tilapia can be hatched by adopting an inverse season fry breeding technology. The fry emergence period of the fries of the java tilapia can be advanced by 2 months for fry emergence by utilizing a greenhouse indoor temperature control fry breeding technology in winter, the greenhouse constructing cost is low, the managementis convenient, the technology is easy to master, popularize and universalize, the operability is strong, and the lowering of the breeding cost is an effective approach for enhancing the breeding superior variety coverage rate of the java tilapia, increasing the yield and enhancing the quality of a product.

Description

technical field [0001] The invention relates to the aquaculture industry, in particular to a technology for building greenhouses in winter and implementing off-season hybrid seedling cultivation of tilapia. Background technique [0002] Tilapia is a tropical fish with strong adaptability, wide feeding habits, few diseases, easy reproduction, fast growth, high yield, delicious meat, etc. It is an excellent breeding species recommended by the Food and Agriculture Organization of the United Nations to the world. Tilapia has been cultured in my country for nearly 50 years. Its seed sources are complicated, there are many varieties, the germplasm is mixed and degraded, the individuals are small, the growth is slow, and the breeding cycle is long. In addition, due to the low temperature and water temperature in winter in many breeding areas, tilapia broodstock that survive the winter naturally in wild ponds cannot spawn, hatch, and fry until the water temperature rises in May each...

AI Technical Summary

Problems solved by technology

Tilapia has been cultured in my country for nearly 50 years. Its seed sources are complicated, there are many varieties, the germplasm is mixed and degraded, the individuals are small, the growth is slow, and the breeding cycle is long.

In addition, due to the low temperature and water temperature in winter in many breeding areas, tilapia broodstock that survive the winter naturally in wild ponds cannot spawn, hatch, and fry until the water temperature rises in May each year. Due to the short growth period and germplasm degradation, D