What characteristic defines the whale shark's tail, or caudal fin, structure?
Answer
Heterocercal, where the upper lobe is longer
The propulsion mechanism of the whale shark relies on its caudal fin, or tail. This fin displays the classic shark characteristic known as heterocercal. Heterocercal means that the structure of the fin is asymmetrical; specifically, the upper lobe of the caudal fin is noticeably longer and typically stronger than the lower lobe. This asymmetry, combined with the stabilizing input from the large dorsal and substantial pectoral fins, is essential for generating the consistent thrust required for long-distance travel as the shark migrates in search of widely distributed food sources.
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