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Stegastes fuscus : ウィキペディア英語版 | Stegastes fuscus
''Stegastes fuscus'', the dusky damselfish, is a species of bony fish in the family Pomacentridae found near the seabed in shallow waters on the western fringes of the Atlantic Ocean.〔(''Stegastes fuscus'' (Cuvier, 1830) ) FishBase. Retrieved 2011-12-29.〕 ==Description== The colour of an adult dusky damselfish varies from brownish-olive to dark grey, with fine, darker-coloured, vertical stripes on the body. The fins are large with sometimes a blue rim around the edge of the dorsal and anal fins. The dorsal fin has 12 spines and 15-16 soft rays while the anal fin has two spines and 13-14 soft rays.〔 The dusky damselfish can be distinguished from the very similar longfin damselfish (''Stegastes diencaeus'') by the shorter, less angular dorsal and anal fins. The maximum length is , but is a more typical length.〔(Territorial Behavior of the Dusky Damselfish, ''Stegastes fuscus'', at Champagne Reef ) Michael Wachter. Retrieved 2011-12-29.〕 The juvenile dusky damselfish is pearly grey with blue spots on the top of its head. It has a large, blue-rimmed, black eyespot where the dorsal fin spines meet the dorsal fin soft rays, and a smaller, similarly coloured eyespot on the caudal peduncle. Some juveniles off the coast of southeastern Brazil have a vivid yellow and orange band on the back and dorsal fin.〔(Unusual coloration pattern in juveniles of ''Stegastes fuscus'' (Actinopterygii: Pomacentridae) ) Zootaxa. Retrieved 2011-12-29.〕
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