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The behaviour of the Spinner Dolphin Stenella longirostris was studied at Sha’ab Samadai, Marsa Alam, Red Sea. The data were collected from October 2005 until September 2006 using surface observations. Four objectives were studied: arrival and departure time of dolphins, distribution of dolphin movements within the lagoon, aerial behaviours and human effects on dolphin behaviour. in spring at 0629 h, 44 min before sunrise; the latest was in autumn, 32 min after sunrise. They left the reef from 54 min (summer) to 3 h 18 min (spring) hr before sunset. Thus the dolphins rested at Samadai reef from 10 h 24 min (summer) to about 8 h (winter) per day. Once the dolphins entered the lagoon, they went directly to Zone A to rest, and their swimming movements were slow. Before midday they remained most of the time in the north western part of Zone A. During the afternoon (1200–1630 h), the dolphins became active, moving rapidly throughout Zone A and frequently in other Shawky & Afifi: Behaviour of Spinner Dolphin at Red Sea, Egypt ٣٨ zones (Fig. 2). In summer, dolphins moved in many directions in all zones during each day, but in winter they tended to stay nearly all the time in Zone A, preferring the north-western side (Fig 3).