Meiacanthus atrodorsalis (Günther, 1877)
Forktail blenny
Paku
Meiacanthus atrodorsalis
photo by Randall, J.E.

Family:  Blenniidae (Combtooth blennies), subfamily: Blenniinae
Max. size:  11 cm TL (male/unsexed)
Environment:  reef-associated; marine; depth range 0 - 30 m
Distribution:  Western Pacific: Bali and the Philippines east to Samoa, north to Ryukyu Islands, south to Rowley Shoals, the southern Great Barrier Reef, and New Caledonia; throughout Micronesia. Replaced by the uniformly yellow species ovalauensis in Fiji, and by Meiacanthus tongaensis in Tonga (Ref. 37816).
Diagnosis:  Dorsal spines (total): 4-4; Dorsal soft rays (total): 25-28; Anal spines: 2-2; Anal soft rays: 15-18. Identified by the blue-edged diagonal black line from the eye and yellow dorsal fin or back. Adults have long filaments on the caudal fin tips; length without filaments (Ref. 48636).
Biology:  Adults are found solitary or in pairs (Ref. 90102) in lagoon and seaward reefs below the surge zone to 30 m depth (Ref. 9710). A common species, often seen along slopes and drop-offs, adults sometimes in small groups (Ref. 48636). Feed on zooplankton and also on small benthic invertebrates. Inoffensive, but immune from predation (Ref. 9710). 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). Mimicked by Ecsenius bicolor and Plagiotremus laudanus (Ref. 90102).
IUCN Red List Status: Least Concern (LC); Date assessed: 28 March 2009 Ref. (130435)
Threat to humans:  venomous
Country info:  Recorded from Lanuza Bay (Ref. 104756), Tañon Strait (Ref. 107276), Dauin-Apo I. (Ref. 127519), Sarangani Bay, Malalag Bay. Bongo Island, Moro Gulf (Ref. 106380). Museum: Batangas, Caban Is., USNM 228927. Palawan, Cocoro Is., USNM 263303. Cebu, USNM 263298. Mactan Is., USNM 263301. Balicasag Is., ANSP 152371; USNM 263307. Mindanao, Zamboanga del Norte, USNM 225123, 263300, 263304, 263305. Negros Or., ANSP 152369, USNM 225128, 263302, 263306,263310 - 12 (Ref. 7401). Also Ref. 2334, 1602, 53416, 121724.


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