| Family: |
Delphinidae (marine or true dolphins) |
| Max. size: |
240 cm TL (male/unsexed); 200 cm TL (female); max.weight: 77 kg |
| Environment: |
pelagic; marine; depth range 0 - 4330 m, oceanodromous |
| Distribution: |
Atlantic Ocean and Indo-Pacific: Stenella longirostris longirostris: Around oceanic islands in the tropical Atlantic, Indian, Western and Central Pacific east to about 145°W. Tropical, subtropical. |
| Diagnosis: |
Spinner dolphins have various forms depending on their geographical locations. Commonly, these are small and slender animals that have a relatively long slender beak. It has a tripartite coloration which consists of a dark grey dorsal cape, lighter grey lateral field and a white or very light ventral field. A dark band runs from the eye to the flipper, bordered above by a thin line. It has a clearly discernible contrast of cape with the lateral field and a smooth curve on the ventral margin of cape over the eye. The ventral white field extends dorsal variably nearly to level of eye; margin speckled; genital and axillary areas confluent. It also has a high to medium contrast between flipper band and gular region wherein variable spots are visible. Its flippers are dark or speckled. In adult males the dorsal fin is falcate to triangular and has a small to medium protuberant ventral keel. |
| Biology: |
Dolphins are directly caught for use as shark-bait in Sta. Ana and Aparri, Philippines (Ref. 77119). Reside in coastal waters (Ref. 97368). May seek shelter in shallow sandy bottoms to protect themselves from predators (Ref. 80498). Observed year-round during daytime in sheltered bays or within lagoons. Forming schools ranging in size from 15 to 30 individuals to as large as 100 to 140 individuals (Ref. 97372). Feeds predominantly at night on deeper, offshore waters (Ref. 122680) and rest during much of the day (Ref. 1394); on small (5 to 10 cm long) fishes, shrimps, and squid in deep offshore waters from the mesopelagic boundary. Follows the diel horizontal migration as well as the vertical migrations of its prey (Refs. 97368). |
| IUCN Red List Status: |
(LC); Date assessed: 20 February 2018 Ref. 123251)
|
| Threat to humans: |
|
| Country info: |
|
Source and more info: www.sealifebase.org. For personal, classroom, and other internal use only. Not for publication.
Warning: Unknown: open(e:\temp\sess_fievk3kegd1s46fh20i12o7ud1, O_RDWR) failed: Permission denied (13) in Unknown on line 0
Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (e:\temp) in Unknown on line 0
