Abstract: The impacts of enclosure aquaculture on fish fauna were examined by investigating the fish communities in enclosure (EA) and non-enclosure (NEA) aquaculture areas in the Huayang lake group across different seasons in 2016. Functional traits related to diet, morphology, ecological habits, and life history were selected to classify and define functional groups by cluster analysis. The impacts of enclosure aquaculture on fish communities were examined by comparing the changes of species composition and biodiversity of functional groups. The results showed that a species pool of 65 species belonging to 41 genera, 12 families and 6 orders could be classified into 17 independent and distinct functional groups. The density of functional groups G1, G3, G4,  G5, G11, G12, G13 and G15 were significantly lower (P<0.05), while the groups G9 and G10 were significantly higher (P<0.05) in EA than in NEA. Moreover, the functional group richness and Margalef’s index in EA were significantly lower (P<0.05), whereas the Pielou’s evenness index was significantly higher (P<0.05) in EA than in NEA. Our results indicated that enclosure aquaculture could significantly alter the community composition and biodiversity of fish functional groups.

Key words: stomatal conductance, biomass, salt stress, exogenous Ca²⁺, photosynthesis