论文部分内容阅读
利用珠湖丰富的水草、螺蚬等自然资源以及优良水质等生态环境 ,开展湖泊围拦养殖大规格河蟹。共产河蟹 160 0 0 0kg ,产值 1760万元 ,总支出 12 36.0 3万元 ,纯利润 369.0 9万元 ,群体增重倍数 8.4 ,平均规格 166.7g ,其中 15 0 g以上商品蟹占 70 %。及早投放大规格一龄蟹种、保持丰富的水生植物生物量以及优良的水质环境是湖泊养殖大规格河蟹的关键
Use Zhuhu abundant aquatic plants, snails and other natural resources as well as excellent water quality and other ecological environment, carry out large-scale cultivation of cages around the lake crab. The total output of crabs was 160 million kg with a production value of 17.6 million yuan, a total expenditure of 12.36 million yuan, a net profit of 3.69 million yuan and a population multiplication factor of 8.4 with an average specification of 166.7 grams, of which 70% were commercial crabs above 150 g. Early placement of large-sized first-crab species, to maintain abundant aquatic plant biomass and excellent water quality environment is the key to large-scale lake crab culture