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黑鮪魚因其體背色黑如墨,身型大如甕,所以一向俗稱「黑甕串」,亦有「海中黑金」之稱謂,大型黑鮪魚其體重在300公斤以上。黑鮪魚是一種跨洋性迴游魚類,其慣於深海環境,每年四月底至六月底是值交配期盛季,隨黑潮向北迴游,在游經綠島附近海域,黑鮪魚改變其前進之水深至約20公尺~40公尺之間以便於捕食飛魚。 Pacific bluefin tuna Thunnusthynnusorientalis The Pacific bluefin tuna’s back is black as ink, and its body is huge as the urn, it has been commonly known as "black urn string", or "black gold of sea". Its weight more over 300 kg. It is a migratory fish will across the ocean. Its habit is in the deep-sea. The end of April to the end of June of every year is the mating season. Follow the Kuroshio migration to north,. When travel through the waters near Green Island, Pacific bluefin tuna will change their advance of the water depth to about 20M ~ 40M for flying fish hunting.