The Slender clingfish(Gastrocyathus gracilis) is a clingfish of the family Gobiesocidae, the only species in the genus Gastrocyathus. This species grows to a length of TL. Endemic to New Zealand, this species is apparently only found in beds of strap-fronded algae. Harpacticoid copepods comprise the main component of their diet. References Gobiesocidae Endemic marine fish of New Zealand Monotypic fish genera Fish described in 1955