fin rays


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fin rays

the skeletal structures that give rise to the shape of fins in fish. They may be cartilaginous, bony or fibrous.
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For a larger sample of fish aged to be 1 yr old by using fin rays, the radius [R.
Unpaired fins red, with metallic yellow or green lines on fin membranes, parallel to fin rays.
Description: Dorsal fin rays IX, 11; anal fin rays 111,9; pectoral fin rays (including upper rudimentary ray) 14; pored lateral line scales 16 + 9 (one paratype with 15 + 6, and another with 16 + 7); scales above lateral line to origin of dorsal fin 2; scales below lateral line to origin of anal fin 6; median predorsal scales 5 (4-5); median preventral scales 6 (one paratype with 5); rows of scales on cheek 2; circumpeduncular scales 15 (15-16); gill rakers 13 (two paratypes with 14); pseudobranchs 13 (12-13).
Diagnosis: A small, slender, round-headed goby with small eyes, long pointed caudal fin and lower 3-7 pectoral-fin rays free from membrane; second dorsal-fin rays always 1,10; anal fin rays always 1,10; pectoral-fin rays 19-21; longitudinal scales 22-25; TRB 7-9; side of head naked, predorsal scales 9-12, extending forward to behind eyes; eyes small and dorsolateral; interorbital broad and convex; jaws oblique, with small caniniform teeth; head pores absent; reduced papillae pattern on head arranged in mostly longitudinal pattern, papillae often pointed, fleshy and may be on short raised ridges; eyes silver when alive, head and body colour pale yellowish-white, with six or seven indistinct dusky bands across nape and sides, and large oval black spot on posterior part of first dorsal fin.
Dorsal rays X, 10; anal rays III, 6; pectoral rays 15; pelvic rays I, 5; anal rays III, 6; caudal fin rays 17; lateral-line scales 42; 3 (4-5 as rudiments) + 9 (2-3 as rudiments) gill rakers on the first arch (total 7-8 + 11-12); vertebrae 23.
On the blind side the tubercles occur at the bases of the longest dorsal and anal fin rays but are absent anteriorly and posteriorly of those areas.
In stage III (mid- and late-metamorphic), the fin rays, gill rakers, scales, and lateral line develop.
Caudal fin distal margin rounded, with 22-24 rays in males and 22-26 fin rays in females.
But shorter, bluer wavelengths can plunge deep, where they are absorbed by the scales and some of the fin rays on both male and female C.
It's reasonable to suppose with those big fin rays that Tiktlik used its hind fins to swim like a paddle," Shubin said.