Why are shrimp raised in Zhejiang twice?

Introduction: this year's shrimp farmers in Changxing will make one-third of profits and one-third of losses, Zhejiang Daily reported on November 29: Zhang Quanshun from Jinxing village, Lincheng Town, Changxing County, and Shen Gerong from Taipingqiao village, Jiapu Town, are both shrimp farmers This year's market has fallen, but their incomes are quite different Zhang Quanshun sold more than 5000 yuan of 120 mu of prawns in the first half of the year It is estimated that the annual income from selling prawns is not enough for feed cost Shen Gerong raised 16 mu of prawns in the first half of the year and 43 mu in the second half of the year, with a net profit of more than 60000 yuan It is understood that this year, among the shrimp farmers in Changxing, there are not a few who win or lose "double heaven" like Zhang Quanshun and Shen Gerong According to the County Fisheries Association, 40000 mu of shrimps have been raised in the county this year, with one third of shrimps farmers making profits and one third losing money Why do you win or lose two different scenes when you breed shrimps? According to the survey, the advantages and disadvantages of shrimp seedlings are one of the main reasons for the "double sky" of winning and losing This year, most of the shrimps released by the loss making shrimps farmers are inbred, and the phenomenon of several generations in the same "pond" is serious, so that the smaller the shrimps are raised, the quality degenerates, and the commodity rate of the shrimps is greatly reduced, with the lowest being less than 10% In Jiapu, Hongqiao and other places, most of the "profit-making households" released the original blue shrimps of Taihu Lake, with excellent species and high yield The average yield of commercial shrimps per mu is about 80kg, more than double that of the same "pond" of several generations The level of culture technology directly affects the efficiency of shrimp culture Ji Lianquan, an engineer at Changxing Aquatic Station, said that many of the losers were "lazy shrimp farmers" who stood by the pond and threw granular feed; some shrimp farmers thought barley flour was the best feed In fact, when barley powder is sprinkled into the water, it can make the prawns eat less than 20% The feed utilization rate is very low, and it affects the water quality At the beginning of this year, when Zhang Quanshun paid someone to clear the weeds in the shrimp pond, Shen Gerong asked someone to plant grass Shen said that there is a proper amount of water grass in the pond, which can regulate the water quality and provide a good habitat for shrimps The tender leaves and buds of aquatic plants are also the top-grade green feed for green shrimps Planting grass and raising shrimps can also be regarded as ecological cultivation Such green shrimps are transparent and sell well Farmers who have made innovations in farming technology have even tasted the sweetness Zhou Yinlong, a shrimp farmer in Taipingqiao village, Jiapu Town, has been making profits all these years The key is that he has an original view on shrimp farming When he raised the shrimps, he always had to cultivate the fry first and then go to the pond to raise them He said that compared with those crayfish that are raised directly in the pond, it seems to be more troublesome, but the stocking density can be controlled It is understood that in order to ensure the benefits of shrimp farming, the relevant departments of Changxing County have taken measures such as cultivating good varieties, promoting practical new technologies, formulating and implementing local standards for aquaculture, establishing demonstration bases, and helping shrimp farmers in pairs, so as to guide shrimp farmers to realize the transformation from quantitative expansion to qualitative improvement.