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cutlass fish:see mackerelmackerel,
common name for members of the family Scombridae, open-sea fishes including the albacore, bonito, and tuna. They are characterized by deeply forked tails that narrow greatly where they join the body; small finlets behind both the dorsal and the anal fins; and sleek,
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(Trichiurus japonicus), a fish of the family Trichiuridae. The naked, elongate, and silvery body resembles a cutlass. The cutlass fish reaches a length of 2 m and a weight of 1 kg. It inhabits the Sea of Japan, the East China Sea, and the South China Sea. The fish is found off the shores of India, western Africa, and Primor’e Krai (USSR). A marine school fish, it feeds on sardines. The cutlass fish has some commercial value.