Black butterflyfish
The black butterflyfish has a darkish bluish-grey body with a contrasting white mouth, and a narrow yellow band on its snout.[5] The black butterflyfish is found at depths of 2 to 20 metres (6.6 to 65.6 ft)[1] in rocky areas which have good coverage of coral and algae in lagoons and on seaward reefs, they can occur in estuaries.[1] The black butterflyfish was first formally described in 1874 by the German born British ichthyologist Albert Günther (1830-1914) with the type locality given as Vavau, Tonga.Although the colouration of this group varies quite a lot, they are all largish butterflyfishes with an oval outline, and most have a pattern of ascending oblique stripes on the flanks.[7][8] The black butterflyfish is occasionally found in the aquarium trade[1] but this species does not thrive in captivity and has a poor survival rate in transit too.