稻田成蟹养殖中扣蟹放养密度对养殖效益的影响  

Effects of Stocking Density of Larval Crab on the Benefit of Adult Crab Culture in Paddy Fields

作　　者：郑岩 刘谞 耿丹 徐显峰 李杨 ZHENG Yan;LIU Xu;GENG Dan;XU Xian-feng;LI Yang(Panjin Photosynthetic Crab Industry Co.,Ltd.,Key Laboratory of Eriocheir sinensis Breeding,Panjin 124200,PRC)

机构地区：[1]盘锦光合蟹业有限公司辽宁省中华绒螯蟹育种重点试验室

出　　处：《湖南农业科学》2019年第8期74-77,共4页Hunan Agricultural Sciences

基　　金：辽宁省重点研发计划指导项目(2017203007)

摘　　要：设置300、450、600、750和900只/667m^2,5个密度梯度每个梯度3次重复,选用23.1±0.8 g/只的雌蟹和20.8±0.7 g/只的雄蟹按照1∶1投放稻田,研究不同放养密度对养殖效益的影响。结果表明:随着扣蟹投放密度增加,成蟹回捕率呈下降趋势,成蟹单产水平呈上升趋势,成蟹规格呈下降趋势,水稻单产呈现先增长后下降趋势。扣蟹投放密度与成蟹回捕率呈线性负相关,相关系数为-0.836,回捕率之间差异显著(P<0.05),回归方程为Y=-0.000 2X+0.785 2(R2=0.675,P<0.01);扣蟹投放密度与单产水平呈线性正相关,相关系数为0.978,单产水平差异极显著(P<0.01),回归方程为Y=-0.035 4X+10.18(R2=0.953,P<0.01);扣蟹投放密度与成蟹规格呈负线性相关,相关系数雄蟹为-0.792,雌蟹为-0.800,雄蟹和雌蟹规格差异均极显著(P<0.01),回归方程雄蟹为Y=-0.029X+114.6(R2=0.598,P<0.01),雌蟹为Y=-0.017X+84.62(R2=0.613,P<0.01);扣蟹投放密度与水稻单产回归方程为Y=-0.000 6X2+0.822 7X+286.84(R2=0.871,P<0.01)。根据试验结果,盘锦地区稻田成蟹养殖中规格为20~25 g/只的扣蟹最佳的投放密度是450只/667m^2左右。The effects of different stocking densities on the results of farming were studied with 23.1±0.8 g/each female and 20.8±0.7 g/each male crabs in paddy fields at a ratio of 1∶1,4 500,6 750,9 000,11 250 and 13 500 crabs/hm^2 were set up in the experiment,and three repetitions for each gradient.The results showed that with the increase of crab density,the recapture rate of adult crabs showed a downward trend,the yield level of adult crab showed an upward trend,the size of adult crab showed a downward trend,and the yield of rice showed a downward trend after the first increase.There was a linear negative correlation between the stocking density and the recapture rate of adult crabs,and the correlation coefficient was-0.836.There was a significant difference between the recapture rates(P<0.05),the regression equation was Y=-0.000 2X+0.785 2(R2=0.675,P<0.01).The density of larval crab was positively correlated with the yield level,the correlation coefficient was 0.978,and the yield level was significantly different(P<0.01),the regression equation was Y=-0.035 4X+10.18(R2=0.953,P<0.01).There was a negative linear correlation between the size of adult crabs and the density of larval crabs.The correlation coefficient was-0.792 for males and-0.800 for females.There were significant differences between size of male and female crabs(P<0.01).The regression equation was Y=-0.029X+114.6 for males(R^2=0.598,P<0.01)and Y=-0.017X+84.62 for females(R^2=0.613,P<0.01).The regression equation between crab density and rice yield was Y=-0.000 6X2+0.822 7X+286.84(R^2=0.871,P<0.01).According to the comprehensive test results,the adult crab market in Panjin area and the breeding technology level,the optimum throwing density of crabs with the specifications of 20 to 25 g per crab is about 6 750 crabs/hm^2.

关 键 词：稻田养蟹 放养密度 回捕率 成蟹规格 养殖效益 

分 类 号：S968.25[农业科学—水产养殖]