"When the commondolphins' food disappeared as a result of overfishing, the dolphins vanished," says Gonzalvo.
“当海豚的食物由于过度捕捞而消失时,海豚便销声匿迹了”冈萨尔沃说。
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This week he saw 40 commondolphins playing in the sea close to his home in north west Scotland but he recommends the Moray Firth close to Inverness for dolphin-watching.