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789
美国使用电击方式抓鲤鱼。
美国肯塔基州鱼类及野生动物资源部(KDFWR)日前举办活动,让媒体拍摄他们将大批亚洲鲤鱼(Asian carp)“电出水面”的画面,以显示亚洲鲤鱼入侵当地生态的严重性。
现场画面可见,小船在巴克礼水坝(Barkley Dam)的河域一通入电流,大批亚洲鲤鱼瞬间跳出河面。KDFWR强调,“电鱼”常用于计算或标记鱼群,被电击的鱼只会暂时震晕,不会致死。
亚洲鲤鱼繁殖迅速。
KDFWR鱼类部门顾问布鲁克斯(Ron Brooks)指出,这场活动主要是为了让民众知道,有关单位在巴克礼水坝下方对付的亚洲鲤鱼数量有多惊人。被电的亚洲鲤鱼经过捕捞后,会出售给制造肥料、鱼饵或鱼类食品的买家。
美国鱼类养殖户于1960至70年代引进4种亚洲鲤鱼,用于对付藻类繁生,然后卖给华裔等少数族群,但部分亚洲鲤鱼很快就逃出池塘,进入附近河川流域。因繁殖速度太快,排挤其他鱼类的生存空间,成为入侵物种。
亚洲鲤鱼对声音敏感,常跳出水面。
由于亚洲鲤鱼对声音相当敏感,一旦有船驶过,就会跳出水面,毁损船上设备或船身,甚至会撞到船员骨折,还会因压力反应而喷出血液与黏液。
肯塔基州与田纳西州此前已合作,雇用渔船捕捞亚洲鲤鱼,KDFWR现正建设“生物声学鱼栅栏”系统,尝试准备透过泡泡、声音与灯光等方式,诱导亚洲鲤鱼转向,以遏止它们继续入侵巴克礼湖(Lake Barkley),破坏两州产值超过10亿美元的观光业。
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