Istiblennius edentulus (Forster & Schneider, 1801)
Rippled rockskipper
Nise-kaeru-uo,  Kaeru-uo
Istiblennius edentulus
photo by Wirtz, P.

Family:  Blenniidae (Combtooth blennies), subfamily: Salariinae
Max. size:  16 cm TL (male/unsexed); 13.2 cm SL (female)
Environment:  reef-associated; brackish; marine; depth range 0 - 5 m
Distribution:  Indo-Pacific: Red Sea and East Africa to the Line, Marquesan, and Tuamoto islands, north to southern Japan, south to Lord Howe and Rapa.
Diagnosis:  Dorsal spines (total): 12-13; Dorsal soft rays (total): 19-21; Anal spines: 2-2; Anal soft rays: 21-23. Males darkly dusky with 5-6 pairs of bands on body and pale stripes on dorsal fin; develop a crest. Females paler in color, bands broken into spots posteriorly, dorsal fin spotted (Ref. 4404).
Biology:  Intertidal (Ref. 31184, 48636). Adults are common in areas with large rubble pieces which are often used to built breakwaters or to support jetty-pylons (Ref. 48636). They hide in cracks or holes when not feeding. They jump out of the water in energetic skippings to another pool when pursued (Ref. 2158, 48636). May remain out of water under rocks or seaweeds (Ref. 31184). They breathe air when out of water (Ref. 31184). Feeds on filamentous algae (Ref. 89972). Oviparous. Eggs are demersal and adhesive (Ref. 205), and are attached to the substrate via a filamentous, adhesive pad or pedestal (Ref. 94114). Larvae are planktonic, often found in shallow, coastal waters (Ref. 94114).
IUCN Red List Status: Least Concern (LC); Date assessed: 27 March 2009 Ref. (130435)
Threat to humans:  harmless
Country info:  Ranges from the Wakayama and Nagasaki Prefectures southward (Ref. 559), including Kochi Prefecture (Ref. 50018). Museum: Bonin Is (Ogasawara), USNM 5896; UMMZ 144779. Chichijima, FAKU 48179. Tanegashima, USNM 71243, 71473, 139676. Chiba Pref., Awa, USNM 195775. Tateyama, USNM 195776. Boshyu, UMMZ 144780. Kanagawa Pref., Misaki, USNM 75842, 71115; UMMZ 144783; CAS-SU 7105, 7068 (holotype of Salarias enosimae). Enoshima, USNM 50297. Sagami Bay, Manazuru, UMMZ 144782. Kagoshima Pref., Akune, USNM 71243. Wakayama Pref., Shirahama, CAS 66851; FAKU 48350, 48353. Marcus I., BPBM 2454 (holotype and paratype of S. gilberti), 2456 (holotype of S. marcusi), 7163; USNM 278394, 296218. Ryukyu Is.: Aguni Shima, ANSP 72052 (holotype of S. atrimarginatus); Okinawa, USNM 71242, 132813, 203560, 278377, 278380. Also Ref. 90102.


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