Last Updated：2025/11/21
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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