Spinner dolphin  (Stenella longirostris)

Dorsal fin: The unpaired fin found on the back of the body of fish, or the raised structure on the back of most cetaceans.
Echolocation: Detecting objects by reflected sound. Used by bats and odontocete cetaceans (toothed whales, dolphins and porpoises) for orientation and to detect and locate prey.
Mesopelagic: Inhabiting the region of the ocean extending from 200 m down to around 1000 m below sea level.
Pelagic: Inhabiting the open oceans.
Polygyny: In animals, a pattern of mating in which a male has more than one female partner, and the male guards access to the females.
Promiscuous: Mating with more than one individual without forming any permanent bonds.
Purse seine: A large fishing net (seine) that hangs vertically in the water by attaching weights to the bottom edge, and is drawn into the shape of a bag to enclose the catch.
Subspecies: A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.

1. IUCN Red List (September, 2007)
   http://www.iucnredlist.org
   
2. Perrin, W.F. (1998) Stenella longirostris. Mammalian Species, 599: 1 - 7.
   
3. CITES (August, 2007)
   http://www.cites.org
   
4. Convention on Migratory Species (August, 2007)
   http://www.cms.int/
   
5. Perrin, W.F. (2002) Spinner dolphin. In: Perrin, W.F., Würsig, B. and Thewissen, J.G.M. Eds. Encyclopedia of Marine Mammals. Academic Press, London.
   
6. Reeves, R.R., Smith, B.D., Crespo, E.A. and di Sciara, G.N. (2003) Dolphins, Whales and Porpoises: 2002-2010 Conservation Action Plan for the World's Cetaceans. IUCN, Gland, Switzerland and Cambridge, UK.
   
7. Perrin, W.F., Dolar, M.L.L. and Robineau, D. (1999) Spinner dolphins (Stenella longirostris) of the western Pacific and Southeast Asia: pelagic and shallow-water forms. Marine Mammal Science, 15: 1029 - 1053.
   
8. Culik, B.M., Würtz, M. and Gerkman, B. (2002) Review on Small Cetaceans: Distribution, Behaviour, Migration and Threats. Convention on Migratory Species, Bonn, Germany. Available at:
   http://www.cms.int/reports/small_cetaceans/data/S_longirostris/s_longirostris.htm
   
9. Würsig, B. (2002) Courtship behaviour. In: Perrin, W.F., Würsig, B. and Thewissen, J.G.M. Eds. Encyclopedia of Marine Mammals. Academic Press, London.
   
10. Perrin, W.F. and Mesnick, S.L. (2003) Sexual ecology of the spinner dolphin, Stenella longirostris: geographic variation in mating system. Marine Mammal Science, 19: 462 - 483.
    
11. Gerrodette, T. and Forcada, J. (2005) Non-recovery of two spotted and spinner dolphin populations in the eastern tropical Pacific Ocean. Marine Ecology Progress Series, 291: 1 - 21.
    
12. Reeves, R.R. (2002) Conservation efforts. In: Perrin, W.F., Würsig, B. and Thewissen, J.G.M. Eds. Encyclopedia of Marine Mammals. Academic Press, London.
    
13. Perrin, W.F. (1999) Selected examples of small cetaceans at risk. In: Twiss, J.R. and Reeves, R.R. Eds. Conservation and management of marine mammals. Smithsonian Institution Press, Washington, D.C.