Abstract: Litopenaeus vannamei was adopted as the research object in this study, which was treated with different doses of T-2 toxin. T-2 toxin dose was adopted as the independent variable, along with morphological indicators of shrimp as the dependent variable. To investigate the correlation within the dose of T-2 toxin and various morphological indexes of treated shrimp, common statistical analysis methods were used including gray correlation analysis method, path analysis and regression analysis. The most convenient and simple biological statistics were filtered out. The experimental results indicated that the body weight, body length, carapace length and the first abdominal segment width of toxic shrimp morphological index were the most influential indexes of T-2 toxin as analyzed by gray correlation and path analysis. The significance test performed by regression analysis showed that the effects of T-2 toxin on body weight, body length, carapace length and the first abdominal segment width of treated shrimp were significant (P<0.05). The results of the three statistical methods were consistent. Body weight, body length, carapace length and the first abdominal segment width were the important morphological indicators of toxic shrimp, and they were negatively correlated with the exposure dose of T-2 toxin. And gray correlation analysis was the most convenient and easiest biological statistics.

Key words: T-2 toxin, Litopenaeus vannamei, morphological indexes, biostatistics