Last Updated：2025/11/21
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In fast-swimming species like tuna, the caudal keel—a lateral ridge just anterior to each side of the tail fin on the caudal peduncle—helps stabilize the fish's attitude at speed and strengthens support of the tail fin.
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In fast-swimming species like tuna, the caudal keel—a lateral ridge just anterior to each side of the tail fin on the caudal peduncle—helps stabilize the fish's attitude at speed and strengthens support of the tail fin.
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caudal keel
Noun
Japanese Meaning
尾柄部の尾びれ直前、魚の左右にある側方の隆起部。高速で泳ぐ魚の場合、この隆起が水中での姿勢の安定性を高め、尾びれの支持を強化する役割を果たす。
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