Its length is between 4 and 8 cm .
The common triplefin , Forsterygion lapillum , is a fish of the genus Forsterygion , found around the coast of New Zealand down to depths of about 15 m .
triplefin 's length is between 4 and 8 cm .
The common triplefin , Forsterygion lapillum , is a fish of the genus Forsterygion , found around the coast of New Zealand down to depths of about 15 m .