BLOCKING EFFECT OF STATIC WATER AND FLOWING WATER BUBBLE CURTAIN ON SCHIZOTHORAX OCONNORI

To explore the effects of different forms of bubble curtains on the avoidance behavior of the Schizothorax oconnori under different water flow conditions, two flow conditions (static water, flowing water), a blank control with a gas flow of 0 under both flow conditions, three gas flow (15, 30, 45 L/min) and two placement angles (90° and 45° to the water flow direction) were utilized under dark environment. The results showed that the working condition 2 had the highest hinder rate (50%) under static water conditions, and that the working condition 7 had the highest hinder rate (50%) under flowing water conditions. The hinder time under flowing water and 90° placement was significantly longer than other working conditions at 15 L/min of the air flow. The hinder time under static water and 90° placement was much longer than other working conditions at 30 L/min. In static water and flowing water, when the attempt number of Schizothorax oconnori reached about 6 times, it showed adaptability to the bubble curtain and passed through the bubble curtain within 48 minutes. The influence distance of the bubble curtain in the flowing water was significantly greater than that in the static water (P<0.05), and the distance from the bubble pipe was significantly greater than that in the static water when Schizothorax oconnori performed avoidance behavior. Therefore, the recommended condition for optimal hinder effect is to place 15 L/min 90 ° under flowing water conditions (Condition 7) and 30 L/min 90 ° under static conditions (Condition 2) with a continuous obstruction time of bubble curtains should not exceed 48 minutes. These results provide a reference for the practical engineering of the bubble curtain arrangement.