THE BARRIER EFFECT OF ELECTRIC FENCE ON CYPRINUS CARPIO UNDER DIFFERENT ELECTRICAL PARAMETERS AND FLOW CONDITIONS
Pulsed direct current electric fencing technology has been widely used to repel invasive species,keep fish away from dangerous areas,and stay within designed zones,such as fish passage.The effectiveness of an electric fencing is influenced by many factors,and there is no consensus concerning what are the primary and secondary effects of these factors.Common carp(Cyprinus carpio)was chosen for research in our orthogonal experiment design.The optimal pulse voltage(PV),pulse frequency(PF),pulse width(PW),and electrode arrangement(EA)in static water were determined.In addition,the effects of the four factors on the fencing effectiveness and fish injury were ascertained.Moreover,the fish effect of flow velocity at 0,0.3,and 0.5 m/s on driving fish was specified.Results show that the effectiveness of the four factors was in the order of EA＞PW＞PF＞PV.The optimal combination was:vertical electrode arrangement in spacing of 80 cm,PV at 140 V,PF of 10 Hz,and PW of 10 ms.There was no significant difference(P＞0.05)in fish injury among the four factors,and the average number of injuries was below 15％of the total number of fish tested.With the increase of flow velocity,the rate of electric fencing decreased first and then increased in general,showing no significant difference.
electrical fencingfencing effectivenesspulsed direct currentcommon carp
万方数据
维普
