Fishing: Slaughter on the Long Line

Like most fishermen, the Japanese crewmen aboard the commercial boat Yoku Maru could not resist a bit of a brag. When the 100-ft. vessel put into Jamaica's Montego Bay last fall, the skipper invited some local sport fishermen aboard. Modestly the Japanese apologized that a mother ship had carted away most of their catch. Then they threw open their lockers. There, stacked like cordwood, were the carcasses of thousands upon thousands of game fish: yellowfin tuna, wahoo, sailfish and blue marlin.

Relations between sport fishermen and their commercial cousins have never been...