Abstract: To investigate the blocking effect of bubble curtain on Schizothorax oconnori, three kinds of bubble curtain with different gas flows (60, 90 and 120 L·min^-1) were set up in the ringshaped water tank. Under the conditions of still water, the blocking effect of bubble curtain on S. oconnori in different periods and the spatial distribution of the fish were observed. Three kinds of bubble curtains had obvious blocking effect on the fish, but with no significant difference in blocking rate (P=0.130). The highest blocking rate reached 81.3% when the gas flow was at 60 L·min^-1. The fish had no obvious adaptability to the bubble curtain during the experiment. In addition, the fish preferred to stay near the bubble curtain at gas flows of 90 and 120 L·min^-1. Our results provide reference for the application of bubble trap technology in engineering.

Key words: Antarctic krill, South Georgia Island, generalized additive model (GAM), catch rate, environmental factor.