Land-based and earthen-pond segmented relay-type culture method for alosa sapidissima

Abstract

The invention relates to a land-based and earthen-pond segmented relay-type culture method for alosa sapidissima. The method comprises the production steps of one-year fingerling land-based culture, two-year fingerling earthen-pond culture and fishing on-sale operation. The method is characterized by comprising the steps of culturing alosa sapidissima fingerlings in land-based culture ponds at the middle or last ten days of July, carrying out autumn culture at the last ten days of September or the first ten days of October, carrying out over-wintering culture at the last ten days of November, carrying out early-spring culture at the middle ten days of March, transferring the land-based-cultured alosa sapidissima fingerlings in earthen-pond outer ponds for culture at the end of April or the beginning of May, carrying out earthen-pond summer culture on the alosa sapidissima at the beginning of July, carrying out earthen-pond autumn culture on the alosa sapidissima at the first ten days of September or the middle ten days of September, starting to carry out fishing on-sale concrete operations at the first or middle ten days of November when each alosa sapidissima reaches commercial fish specifications, i.e., 500g, picking 300 to 500 tails of individuals reaching the specifications, transferring the picked individuals to a land-based culture pond for temporary culture, continuing to culture individuals not reaching the specifications in original ponds, and carrying out partial net-hauling on the land-based culture pond for marketing during selling.

Description

technical field [0001] The invention relates to aquaculture, in particular to a land-based and earthen pond segmented relay culture method for American shad. Background technique [0002] American shad (Alosa sapidissima), commonly known as American shad, is mainly distributed in the rivers and oceans of the Atlantic west coast of North America from Quebec, Canada to Florida, the United States. American shad is a reproductive and migratory fish. It is plump and plump, with delicious meat and high economic value. It has been widely introduced all over the world. In China, the Shanghai Fisheries Research Institute took the lead in introducing fertilized eggs produced by wild shad from the Mississippi River in the United States in 1998, and then hatched fertilized eggs, cultivated seedlings and cultured them. Because American shad is similar to Chinese shad in appearance and comparable in meat quality, American shad is also deeply loved by people when the Yangtze River shad is...

AI Technical Summary

Problems solved by technology

In industrialized farming, due to the special physiological and ecological characteristics of American shad, in Jiangsu and Zhejiang areas, the water temperature is too high in summer and it will die of heat, and the water temperature in winter is too low and it will freeze to death. This makes farmers need to use extraction when farming American shad. Deep well water below 150 meters underground with a stable water temperature of 16-17°C in winter and spring, but underground deep well water resources are limited and have geographical limitations, and many coastal cities have restricted underground deep well water for aquaculture; In breeding, due to the water temperature, ponds with a depth of more than 3 meters are needed. At the same time, due to the impatient nature of American shad, farmers rarely use nets for operation. Generally, farmers raise about 1,000 seedlings per mu in the first year. In the second year, they will be caught directly in the second year. This kind of earthen pond culture method has the following disadvantages: 1) The soil quality requirements of the pond are relatively high, and there are few ponds with a depth of more than 3 meters, and the pond stems are easy to collapse, causing huge losses to the farmers; 2) Pond breeding space is wasted. In the first year of culturing American shad, American shad individuals are small, and the low density of 1,000 tails / mu causes a waste of pond breeding space; , the taste and freshness have dropped significantly, so live fish or chilled fish need to be sold, and at the same time the price is relatively high, and they go directly to the restaurant. The number of fish sold each time is not much, only 60-100 fish, and each sale is in the big pond of the earthen pond. The lila net is very harmful to American shad, and it will also interfere with the feeding and growth of individuals that are not up to the specification

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