Siganus luridus (Rüppell, 1829)
Dusky spinefoot
Siganus luridus
photo by Wirtz, P.

Family:  Siganidae (Rabbitfishes)
Max. size:  30 cm TL (male/unsexed)
Environment:  reef-associated; depth range 2 - 40 m
Distribution:  Western Indian Ocean: Persian Gulf (Ref.80050); Red Sea and East Africa to islands in the western Indian Ocean. Immigrant to Mediterranean via the Suez Canal.
Diagnosis:  Dorsal spines (total): 13-14; Dorsal soft rays (total): 10-10; Anal spines: 7-7; Anal soft rays: 9-9; Vertebrae: 13-13. Regional variation in color exists. Anterior spines of median fins slender and pungent, posterior spines stout, all venomous including that on the nape. Preopercular angle 87-97 degrees. Anterior nostril with a long, broad flap covering posterior nostril when depressed. Variable cheek scalation. Midline of thorax devoid of scales between the pelvic ridges.
Biology:  Found in small schools in very shallow water close to the bottom. Prefer hard bottoms of compacted sand with rock or coral debris. Solitary adults and groups of 3 or 4 adults have also been observed. Feed on a wide range of benthic algae. May suddenly stop and erect its fins (dorsal, anal and pelvic) presenting an encircling array of spined to potential predators; these spines are venomous. A food fish that is occasionally poisonous (Ref. 4537). Probably does not adapt well in captivity (Ref. 12382). Minimum depth from Ref. 9710.
IUCN Red List Status: Least Concern (LC); Date assessed: 19 July 2017 Ref. (119314)
Threat to humans:  venomous
Country info:   
 

Entered by: Capuli, Estelita Emily - 23.08.91
Modified by: Luna, Susan M. - 13.05.14

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