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单词 anal fin
释义

anal fin

noun Zoology
An unpaired fin located on the underside of a fish posterior to the anus.The second dorsal and the anal fin are well-separated from the caudal fin....
  • The fleshy, stalk-like pectoral and pelvic fins and similar fleshy second dorsal and anal fins are also unlike any other marine fishes.
  • Dorsal and anal fins are typically completely formed by the time the fish has reached 7-13 mm.
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更新时间:2025/3/20 18:26:09