19 дек. 2016 г. · The primary use of the caudal fin (hetereocercal or homocercal) is to provide thrust. The upper lobe of the caudal fin produces the most thrust, ... |
Swimming is achieved by side-to-side undulations of the caudal, or tail fin, and often part of the trunk; these motions propel the shark forward. Unlike those ... |
The lower lobe is the only part of the caudal fin that is valuable in trade (the upper lobe is usually discarded). Second dorsal fins, paired pelvic fins and. |
Sharks possess a heterocercal caudal fin in which the dorsal portion is usually noticeably larger than the ventral portion. This is because the shark's ... |
The lower lobe is the only part of the caudal fin that is valuable in trade (the upper lobe is usually discarded). Second dorsal fins, paired pelvic fins and. |
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