【摘要】 比较研究了姚江水域生态选育品系与自然品系日本沼虾虾苗的养殖生长与生产情况。结果表明:(1)0、20、40、60、80到100 d养殖日龄选育品系日本沼虾虾苗体长、体重分别为1.0、2.5、2.7、3.2、4.1、5.3 cm和0.023、0.423、0.562、1.006、1.464、3.255 g,自然品系日本沼虾虾苗体长和体重分别为1.0、2.3、2.5、3.0、3.5、4.4 cm和0.024、0.348、0.454、0.863、1.449、1.887 g;(2)选育品系单季养殖单位面积产量和产值分别为1 065 kg/hm2和14.91万元/hm2,自然品系单季养殖单位面积产量和产值分别为690 kg/hm2和7.59万元/hm2。更多还原

【Abstract】 Contrast the growth characteristics between Yuyao breeding strain and natural strain about Macrobrachium nipponense,the average length is 1.0,2.5,2.7,3.2,4.1 and 5.3 cm,respectively,and the average weight is 0.023,0.423,0.562,1.006,1.464 and 3.255 gram,respectively,on breeding strain every 20 d;the average length is 1.0,2.3,2.5,3.0,3.5 and 4.4 cm,respectively,and the average weight is 0.024,0.348,0.454,0.863,1.449 and 1.887 gram,respectively,on natural strain.In early stage the two strains have no difference in length and weight,but late stage the breeding strain shows obvious superiority.Contrast the economic effect,per unit area yield and output value are 1 065 kg/hm2 in breeding strain,and 690 kg/hm2 in natural strain.更多还原