Crab: The High Price Of Consumer Hot To Prevent Degradation Of Germplasm

Jiangsu crab farming industry since the 20th century, 80 years and now has a fishing industry in Jiangsu Province, the characteristics of industries and competitive industries, accounting for the crab of the national total output of the "half" crab fishery in Jiangsu Province has become the highest value species.

Today has been brilliant performance brand of giving birth

According to reports, the 20th century 90's, after the success of artificial propagation of the crab, crab rise of artificial

Rising consumer prices in recent years to increase year by year

With the improvement of living standard, crab consumption increased year by year. In the annual "Autumn High Crab" eat crab season crab fishery market volume doubled. Agricultural products wholesale market in Nanjing Bridge Information Department Huimin Zhang Mao-hua, director told the author, crab consumption "hot", the market volume of 30 tons per day, while the normal daily volume is only half a ton. As consumption increases, crab prices rising year by year, the second half of 2002, the Nanjing market only 3 ounces of crab weight average wholesale price of 51.7 yuan per kilogram, the second half of 2003 rose to 57 yuan, while the second half of 2004 rose to 60.8 yuan. From the specifications on the analysis of large-sized crab, crab prices much higher than the price of small size, big size brand crab prices are even more alarming, 2004 Yangcheng Lake Crab Industry Association announced acquisition of Lake hairy crabs guided price is: 3 Two of the female crab 4 Two of the male crab 224 yuan per kilogram. The price rose 6% over 2003, while in 2003 than in 2002 rose 31%.

Declining attention to the selection of germplasm hybrid seeds

In recent years, scale crab farming, many of the problems hidden gradually exposed. Jiangsu Institute of Freshwater Fisheries Resource Room Main Renzhou Gang researcher told the author, due to different river systems between the blind crab germplasm introduction to mixed, other, followed years of the same parent cause further degradation of crab germplasm. In production mainly as follows: a change in the growth cycle, crab size is not ideal, crab lower resistance to disease, disease-prone, thus affecting the yield and economic benefits of crab.

Liu Wenbin, Nanjing Agricultural University Associate Professor of Department of Fisheries believes that the current support options crab breeding is the key. He said, crab breeding in order from the Yangtze River for the best, choose the juvenile crab size should be controlled at 5 to 10 grams, too easily lead to sexual precocity, the small market size below standard.

Experts advise farmers when they keep control of crab stocking density, not to indulge in the pursuit of yield per mu, blindly increasing breeding density is not desirable, because the density is too large, crab survival rate will decline. Crab farming, animal feed should be fed to grasp scale, to prevent After feeding excessive water pollution, and increase the risk of disease. Conditions can grow plants in the crab tank, to improve the farming environment. In addition, fed artificial diets can increase the market size crab.

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