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Fig. 3. Sleep swimming in the damselfish Dascyllus marginatus measured by
video filming them in infrared light on a coral reef in Eilat, Red Sea. The
stroke frequencies of the dorsal, pectoral and caudal fins are about doubled
at night when the fish hide inside coral (Stylophora pistillata)
compared to the `normal swimming' performed outside the coral during the day.
From Goldshmid et al. (Goldshmid et al.,
2004). Reproduced with permission from Limnology and
Oceanography.
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