Ecological cultivation mode capable of simulating river-sea migration of Yangtze coilianasus

Abstract

The invention relates to an ecological cultivation mode capable of simulating the river-sea migration of Yangtze coilianasus. The ecological cultivation mode capable of simulating the river-sea migration of Yangtze coilianasus relates to cultivation environment, water quality and feedstuff and includes three phases of juvenile coilianasus fry cultivation phase which comprises culturing green alga, rotifer, cladocera and juvenile prawn as the feedstuff; coilianasus fry seedling cultivation phase which comprises culturing coilianasus fry seedlings in double-layer hollow greenhouses with seawater, changing the salinity of the seawater over time and culturing green alga suitable for growing in the seawater as feedstuff; adult fish gonad development phase which comprises performing fresh water cultivation and culturing green alga, rotifer, cladocera, small fish and small prawn which are suitable for fresh water cultivation as feedstuff. By manually changing salinity, water pressure, water flow, temperature and the like and enhancing water flow speed stimulation, the development of the gonad of adult coilianasus can be promoted, and nutrient substance accumulated inside the body of the coilianasus is transported towards the gonad to form nutrient substance with the unique flavor and taste of the Yangtze coilianasus through substance destruction and recombination.

Description

technical field [0001] The invention specifically relates to an ecological breeding mode imitating the river-sea migration of the Yangtze sword anchovy. Background technique [0002] Commonly known as saury, saury is distributed in the Yangtze River, Yellow River, Qiantang River, other rivers leading to the sea and along the coast in my country. In history, the Yangtze River basin has the largest output. The saury is famous for its tender meat and delicious taste, especially the Yangtze saury. Prices vary greatly. For example, before the Ching Ming Festival in 2012, the price of 150g Yangtze saury was 16,000 yuan / kg, while that of Qiantang river saury was only 2,400 yuan / kg. The taste of artificially farmed saury is not as good as that of lake saury. The reason is that the Yangtze saury is very tender and fresh, and other river saury are much inferior. [0003] The quality of saury is determined by the different living environments of saury. The Yangtze saury migrates b...

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Problems solved by technology

[0004] In the 1970s, the output of Yangtze saury could reach 10,000 tons, but now the annual output is less than 10 tons. In 40 years, it has dropped by a thousand times, and the trend of geometric progression has made the protection of the Yangtze saury species a top priority. In the past 10 years, many people of insight Conduct research on saury and explore the mode of artificial breeding. At present, there has been a breakthrough in the cultivation of nano-miao ponds in Guanjiang. Although the fish is alive, it does not grow fast and does not grow large, especially the taste is bad. It is not as good as "Lake Knife" and Qiantang. The river saury also migrates between rivers and seas, and the Yellow River saury migrates between rivers and seas, but neither has the quality and taste of the Yangtze saury. "Lake saury" is a saury that stays in the lake and does not migrate. The quality is even worse than that of the Yangtze saury or Qiantang saury.

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