Siganus rivulatus Forsskål & Niebuhr, 1775
Marbled spinefoot
photo by Field, R.

 Family:  Siganidae (Rabbitfishes)
 Max. size:  27 cm TL (male/unsexed)
 Environment:  reef-associated; depth range 1 - 30 m
 Distribution:  Western Indian Ocean: several localities in East Africa, and from the Red Sea to the eastern Mediterranean via the Suez Canal.
 Diagnosis:  Dorsal spines (total): 13-13; Dorsal soft rays (total): 10-10; Anal spines: 7-7; Anal soft rays: 9-9; Vertebrae: 23-23. Upper body gray, green or brownish, silvery below; iris iridescent silver or golden. Body color patterns extend to the fins. Spines slender, pungent and venomous. Preopercular angle 88°-96°; cheeks scaled; midline of thorax, isthmus and midline of belly without scales. Frightened fish become mottled or with 6 diagonal zones across side. Tip of broad-based flap of anterior nostril reaching at least halfway to orifice of posterior nostril.
 Biology:  Inhabits shallow waters and generally in schools of 50 to several hundred individuals; prefers protected areas. Feeds by grazing on algae.
 IUCN Red List Status:   (Ref. 96402)
 Threat to humans:  venomous
 Country info:   
 

 Entered by: Luna, Susan M. - 19.07.91
 Modified by: Bailly, Nicolas - 19.04.11

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