| 释义 |
Definition of anal fin in English: anal finnoun Zoology An unpaired fin located on the underside of a fish posterior to the anus. Example sentencesExamples - The second dorsal and the anal fin are well-separated from the caudal fin.
- The dorsal and anal fins, which push the fish along, are way off the central axis of its body, yet the animal swims a straight path without rocking up and down.
- The siganids have many strong spines with venom glands in dorsal and anal fins that contain a painful toxin.
- 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.
Definition of anal fin in US English: anal finnoun Zoology An unpaired fin located on the underside of a fish posterior to the anus. Example sentencesExamples - The dorsal and anal fins, which push the fish along, are way off the central axis of its body, yet the animal swims a straight path without rocking up and down.
- The siganids have many strong spines with venom glands in dorsal and anal fins that contain a painful toxin.
- Dorsal and anal fins are typically completely formed by the time the fish has reached 7-13 mm.
- 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.
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