山塘小水库蚌鱼混养模式的结构优化

Structural optimization of polyculture model of fish-mussel in small-scale reservoirs

对14座山塘小水库进行为期1年的蚌鱼混养生产试验,运用Cobb-Douglas生产函数和数理统计方法,研究了吊养1+龄三角帆蚌的山塘小水库鱼类放养密度及比例。结果表明:利润率(P)与吃食性鱼每公顷放养量(FS)、饵料系数(FCR)的关系分别为P=-0.000 04FS2+0.100 4FS-20.006(R2=0.809 3)和P=1241.4FCR-4.450 2(R2=0.820 2);吃食性鱼和滤食性鱼增重倍数比(FWR)与放养量比(FSR)的关系为FWR=-0.569 7Ln(FSR)+1.420 8(R2=0.916);鲢和鳙增重倍数比(LWR)与放养量比(LSR)的关系为LWR=1.636 1LSR-0.544 8(R2=0.931)。养鱼收入(Y)与鱼种(X1)、饲料(X2)、劳动力+租金(X3)和材料(X4)的投入量之间的关系为Y=e0.64X10.227X20.751X30.029X40.044(R2=0.983)。分析认为:吊养珍珠蚌的山塘小水库鱼类合理放养技术参数:(1)吃食性鱼和滤食性鱼的放养比例为2.09∶1;(2)鲢、鳙的放养比例为2.71∶1;(3)鲢、鳙和吃食性鱼每公顷的放养量分别为469.8 kg、173.4 kg和1 344.15 kg。

Based on a one-year polycuhure of fish-mussel in 14 small-scale reservoirs, the stocking density and proportion of fish in small-scale reservoir in which one year old freshwater mussel Hyriopsis cumingii were suspended were studied by applying Cobb-Douglas production function and mathematical statistics. The results showed that the relation between profit margin （P） and stocking number of feed feeding fish per hectare （Fs） and food conversion ratio （ FCR ） were P = - 0. 000 04FS^2 ＋ 0. 100 4FS - 20. 006 （ R^2 = 0. 809 3 ） and P = 1241. 4FCR^-4 .4502（R^2 = 0. 820 2）, respectively, while the relation between body weight gain multiple ratio （ FWR ） and stocking number ratio （ FSR ） of feed feeding fish to filter feeding fish, body weight gain multiple ratio （LWR） and stocking number ratio （LSR） of silver carp to bighead carp were FWR = -0. 569 7Ln（FSR） ＋ 1. 420 8 （R^2 = 0. 916） and LWR = 1. 636 1LSR^-0.5448 （ R^2 = 0. 931 ）, respectively. The relation between fish output （Y） and 4 input factors, such as fish seed （ X1 ）, feed （ X2 ）, labour and rent （ X3 ） and materials （ X4 ） was Y=e^0.64X1^0.227X2^0.751X3^0.029X4^0.044（R^2=0. 983）. It was suggested that the technical parameters of rational stoeking fish in small-scale reservoir in whieh freshwater were mussel suspended included （ 1 ） the stocking proportion of feed feeding fish to filter feeding fish was 2.09： 1, （2） the stocking proportion of silver carp to bighead carp was 2.71 ： 1, （ 3 ） the stocking number of silver carp, bighead carp and feed feeding fish per hectare were 469.8 kg, 173.4 kg and 1 344.15 kg, respectively.