NOUN
- either of a pair of fins situated just behind the head in fishes that help control the direction of movement
How To Use pectoral fin In A Sentence
- Hippocampus satomiae is distinguished from congeners in having a combination of: extremely small size (height 11 mm, standard length 14 mm); 12 trunk rings; 27-28 tail rings; reduced ossification of inferior and ventral trunk ridges; 13 dorsal fin rays; 9 pectoral fin rays; anal fin small or absent; brooding area in males anterior to anus; well-developed spine on snout between eyes; distinct raised coronet with laterally expanded anterior and posterior flanges ( 'H-shaped' when viewed from above); snout without a bulbous tip; single gill opening on midline directly behind coronet supported by raised cleithral bone; large spines above eyes Practical Fishkeeping news (RSS)
- Like its relative the puffer fish, the boxfish propels itself by waving its dorsal fin (on top of its body) and its anal fin (on the bottom), and it steers primarily with its pectoral fins and tail fin.
- When hunting, they crawl on their outspread pectoral fins and sift through the sand.
- The pectoral fin is set low on the lateral flank behind the notch of the cleithrum and is supported by a small rounded lobe covered with minute rhombic scales.
- Boxfishes and three-spine sticklebacks hover very well by oscillating their pectoral fins with large attack angles on both recovery and power strokes.
- The body shows well-developed paired lateral fins (presumably true pectoral fins), indicating good stability, dorsal and anal fins, and a heterocercal tail (the lower lobe of the tail is elongated).
- The legs (they're pectoral fins, really) allow batfish to crawl about the seafloor.
- Boxfishes and three-spine sticklebacks hover very well by oscillating their pectoral fins with large attack angles on both recovery and power strokes.
- The frogfish uses its stalked pectoral fins and its pelvic fins to slowly ‘walk’ across the bottom.
- The most striking features described by this component are a relative deepening of the suborbital head region, shortening of the caudal peduncle, and a dorsad displacement of the pectoral fin.
