When a humpback whale swam several miles up the Sacramento River past San Francisco's Golden Gate Bridge last year, U.S. experts at first employed a common ruse of Japanese whalers--beating metal tubes underwater to create a sound whales detest--to drive the whale back to sea. The method seemed to work at first, but soon afterwards the whale turned around again.
去年年底，一條座頭鯨越過舊金山的金門大橋，沖入沙加緬度河上游幾十公里處。美國的專家，先以日本捕鯨人常用的方法﹘ ﹘在水底敲擊金屬管法，製造鯨討厭的聲音，驅使它往海裡走；這個辦法起先奏效，但不久它又回頭。