Abstract: Turbulence, a complex flow regime, exists universally in nature. It has importantinfluences on the survival of fish. Turbulence is closely related to the swimming behavior of fish, which has received extensive attention. In this study, with juvenileAristichthys nobilis (10.10±0.54 cm of body length) as experimental objects, a ball (10 cm in diameter) was put in a tank to generate a nonuniform turbulence field, and turbulence intensity was chosen as the characteristic magnitude of turbulence. We analyzed the relationship between the responses of swimming behavior of A. nobilisand turbulence intensity when the fish migrated upstream, with the spatial distribution of turbulence being overlapped with typical trajectories of juvenileA. nobilis. Theresults showed that the upstream swimming behavior ofA. nobilis was affected by the turbulence intensity. The sensitive turbulence intensity of juvenileA. nobilis ranged 8.7-9.2 cm·s^-1 when the flow velocity was 14, 26 and 34 cm·s^-1, and the preferred turbulence intensity was 5.25-8.4 cm·s^-1. The results would improve our understanding of the relationship between fish behavior and turbulence and provide guidance for the conservation ofA. nobilis.

Key words: wind speed, precipitation, sunshine, climate change, temperature, Changbai Mountain Water Conservation and Biodiversity Protection Area.