A method for increasing the size of fish species in American shad pond culture in the current year

Abstract

The present invention relates to the field of aquaculture, in particular to a method for improving the standard of American shad pond cultured fish fingerlings in the current year. It consists of 8 production steps: shade time, building a pond greenhouse, and pulling the net out of the pond. The outstanding advantages of the present invention are: the technical proposal of the present invention has improved the two modes of pond cultivation of American shad in those years: delaying the covering and removing the shading film in advance, shortening the shading time of the pond, building a pond greenhouse in time, etc., which solves the problem. American shad pond culture has the problem of small size of fish species in the pond, which retains the advantages of these two pond culture modes and avoids the shortcomings of the two culture modes. The invention is simple and convenient to operate, does not require refined operation and systematic training, is easy to be accepted and popularized by people, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of aquaculture, in particular to a method for improving the size of fish fingerlings in the pond culture of American shad. Background technique [0002] American shad (Alosa sapidissima) belongs to the order Clupeomorpha, Clupeiformes, Clupeidae, and Alosa. It is a reproductive migratory fish, mainly distributed on the west coast of the Atlantic Ocean from North America Quebec, Canada to Florida rivers and oceans in the United States. American shad is plump and plump, with delicious meat and high economic value. It is suitable for pond culture and factory culture, so it is widely introduced all over the world. In China, Shanghai Fisheries Research Institute took the lead in introducing the fertilized eggs of American shad from the United States for artificial breeding in 1998. Because American shad is similar in appearance and meat quality to Chinese shad (Tenualosa reevesii), the cultivation of American sh...

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic shad farming area is expanding day by day. There are mainly three farming models, namely industrial farming, net cage farming, and pond farming. However, industrial farming also has certain limitations. The cost is high, and it is necessary to extract deep well water or use mountain spring water to maintain the water temperature of aquaculture water; while cage aquaculture requires large water surfaces, such as: large rivers, rivers, lakes, etc. Under the situation that the national environmental protection requirements are increasing, it is necessary to extract groundwater or The culture mode of net cages with large water surfaces will face severe environmental pressure and is increasingly questioned, while the culture mode of American shad ponds is increasingly favored

[0004] However, research has found that the fish species raised in American shad ponds in the current year all have the problem of small size (body length 12.0-12.46cm, weight 23.48-26.53g) at the end of the year (Dong Yan, Zhang Qiuhu. American shad hatching domestication and artificial breeding are the key Technology [J]. Scientific Fish Farming, 2009 (06): 9-10; Shi Yonghai, Xu Jiabo, Liu Yongshi, etc. The growth law and difference of American shad species in the year of culturing in exposed ponds and shaded ponds [J]. Shanghai Journal of Ocean University, 2019, 28(2): 161-170), which caused the problems of small commercial fish market size and low market yield in the second year, which seriously affected the commercial fish breeding benefits in the second year; and the research found that Both the open pond and the shaded pond culture mode of American shad species have their own advantages and disadvantages (Shi Yonghai, Xu Jiabo, Liu Yongshi, et al. The growth rules and differences of American shad species cultured in open ponds and shaded ponds[J ].Journal of Shanghai Ocean University, 2019,28(2):161-170)

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