The common triplefin (Forsterygion lapillum) is a small blennioid fish of the family Tripterygiidae. It is one of 26 endemic species of triplefin found in New Zealand across 14 genera.[2] This species is very common in the temperate coastal and intertidal waters of New Zealand where it often lives in cobble habitats,[3][4][5] but has been found as deep as 30 m.[6] It has a maximum body length of around 70 mm and lives for up to three years.[7]
Common triplefins are generally opportunistic predators, eating mostly amphipods, ostracods, limpets, and polychaetes.[8] Males will aggressively defend their territory during the breeding season as well as guard eggs after they are laid by females, who contribute no parental care.[9]
^Fricke, Ronald (1994). Tripterygiid fishes of Australia, New Zealand and the Southwest Pacific Ocean: with descriptions of 2 new genera and 16 new species (Teleostei). Theses zoologicae. Champaign, Ill: Koeltz Scientific Books. ISBN978-3-87429-370-9.