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2. Fish fin - Wikipedia

   en.wikipedia.org/wiki/Fish_fin

   Anal/cloacal fin The anal/cloacal fin is located on the ventral surface behind the anus/cloaca. The bones that support the anal fin are called pterygiophores. There are up to two series, a proximal series (axonosts) and a distal series (baseosts) Most fish use their anal fin to stabilize while swimming

3. Pelvic fin - Wikipedia

   en.wikipedia.org/wiki/Pelvic_fin

   In actinopterygians, the pelvic fin consists of two endochondrally-derived bony girdles attached to bony radials. Dermal fin rays (lepidotrichia) are positioned distally from the radials. There are three pairs of muscles each on the dorsal and ventral side of the pelvic fin girdle that abduct and adduct the fin from the body. [citation needed]

4. Pomacentrus moluccensis - Wikipedia

   en.wikipedia.org/wiki/Pomacentrus_moluccensis

   The dorsal fin has 13 spines and 13 to 14 soft rays. The anal fin has 2 spines and 14 soft rays; the first anal spine is half the size of the second. The first ray of the pelvic fins is much elongated, and is longer than the head. The pectoral fins are rather shorter, and the caudal fin is shallowly forked with rounded lobes. [1]

5. Sheepshead minnow - Wikipedia

   en.wikipedia.org/wiki/Sheepshead_minnow

   The body is covered by large, circular scales, the ones on the cheeks and the top of the head and a single scale just above the pectoral fin being the largest. The male is generally larger and more deep-bodied than the female, with larger dorsal, pelvic and anal fins. [4] The color of the sheepshead minnow is olive green above and yellowish below.

6. Fish anatomy - Wikipedia

   en.wikipedia.org/wiki/Fish_anatomy

   The tail fin can be rounded at the end, truncated (almost vertical edge, as in salmon), forked (ending in two prongs), emarginate (with a slight inward curve), or continuous (dorsal, caudal, and anal fins attached, as in eels). Anal fins: Located on the ventral surface behind the anus, this fin is used to stabilize the fish while swimming.

7. Glossary of ichthyology - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_ichthyology

   A small fin, positioned behind the dorsal or anal fins, that is supported by a ray or rays. fluviatile Living in rivers. free rear tips (of fins) The posterior tip of the fin that is closest to the most posterior point of the fin base. frontal ridge A ridge running along the top of the head along the midline. furcate Forked. fusiform

8. Fish locomotion - Wikipedia

   en.wikipedia.org/wiki/Fish_locomotion

   Fish in the order Gymnotiformes possess electric organs along the length of their bodies and swim by undulating an elongated anal fin while keeping the body still, presumably so as not to disturb the electric field that they generate. Many fish swim using combined behavior of their two pectoral fins or both their anal and dorsal fins.

9. Canthidermis sufflamen - Wikipedia

   en.wikipedia.org/wiki/Canthidermis_sufflamen

   The first dorsal fin has three spines, the second dorsal fin has between 25 and 28 rays (mode: 27), the anal fin has between 23 and 25 rays (mode: 24), the pectoral fins have either fifteen or sixteen rays each (mode: 15), and the caudal fin has twelve rays. The pelvic fin in this species is rudimentary and has been reduced to a single rayless ...