
The Spinner
Stenella longirostris
​General description
The spinner dolphin is a small, slender cetacean with a fusiform body. Its rostrum is long and well defined, with a slightly rounded melon. Its dorsal fin, located in the middle of the body, is high, sickle-shaped in the female and triangular in the male. Its pigmentation is organized into three parts: it has a dark gray dorsal cape, gray sides and a whitish ventral side. The jaws have a contrast between the dark upper part and the light lower part.
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Habitat
Espèce cosmopolite, le dauphin à long bec fréquente les eaux tropicales et subtropicales, généralement en pleine mer. On l’observe cependant souvent près des côtes. Excellent plongeur, il descend généralement entre 200 et 300 mètres, bien qu'il puisse atteindre 600 mètres.
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Diet
Mainly nocturnal, the spinner dolphin hunts fish and cephalopods, such as squid, in deep waters.
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Behavior
Gregarious, this dolphin lives in groups of tens to hundreds of individuals. Very playful, he often approaches ships and has fun in their wake. His acrobatic movements, such as somersaults or spins, are characteristic. This dolphin swims in a zigzag pattern, which appears to be a social signal to coordinate group movements toward feeding areas. It is also known to associate with other species, such as the pantropical spotted dolphin or the humpback whale.
Family : Delphinidae​​
Size (m)​​
Weight (Kg)
Lifespan (years)
Sexual Maturity
(years)
Gestation
(month)
1.70 - 2.10
60 – 80
23
7 - 10
1.70 - 2.10
60 – 80
23
4 - 7
10 - 11

Global distribution of the Spinner Dolphin, adapted from Jefferson, T.A., Webber, M.A. and Pitman, R.L. (2015). Marine Mammals of the World: A Comprehensive Guide to Their Identification. 2nd ed. Elsevier, San Diego, CA.

Observations in the Lesser Antilles (CCS)
Main threats
Entanglement in fishing gear, such as gillnets, can cause serious injury or death. Although bycatch is common, another significant threat is noise pollution, caused by human activities such as maritime traffic, disrupting their communication and behaviors.
Insufficient Data
IUCN Status :

References
- Sylvestre, Jean-Pierre. 2014. Cetaceans of the world Systematics, ethology, biology, ecology, status. Practical guide. Éditions Quae.
- NOAA Fisheries