Effects of Different Stocking Density on Growth of Rana nigromaculata in Rice-frog Symbiosis in the Mountainous Area of Guizhou Province
To explore the influence of stocking densities on the growth of Rana nigromaculata in rice-frog symbiosis,This experiment adopts a field trial method,five stocking densities(75,105,135,165,195 frogs/m2)were designed.The growth differences of Rana nigromaculata under the different stocking densities were compared,the growth model of body length,body weight and growing period was established,and we also fitted the relationship between body length,hind limb length,head width and body weight.The results showed that the stocking density has a significant effect on the body length,head width,hind limb length,and body weight(P＜0.05).The body length,head width and hind limb length are highly correlated with body weight,and the fitting degree could reach 0.9563;under different stocking densities,when the stocking densities were 75 and 135 frogs/m2 respectively,the maximum value of the growth curve of body weight and breeding length were both 2.33,which were significantly higher than 165(2.19)and 195(2.17)frogs/m2.So the maximum fitting degree occurred when the stocking density was 135 frogs/m2.In the distribution of body weight,the highest body weight proportion of over 40 g appeared when the stocking density was 135 frogs/m2,which was significantly higher than that of other treatment groups.Therefore,in the rice-frog symbiosis,the reasonable stocking density of the Rana nigromaculata should be controlled at about 135 frogs/m2.
mountainous area of Guizhou provinceRana nigromaculataintegrated rice-frogstocking densitygrowth model
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