Threadfin Dartfish

"Ptereleotris hanae", the Blue hana goby, is a species of dartfish native to the western Pacific Ocean. It is a reef inhabitant, being found at depths of from 3 to 50 metres, though usually no shallower than 6 metres. It inhabits burrows made by alpheid shrimp, but unlike the "Amblyeleotris" gobies who normally associate with these shrimp, this species has no interactions with their shrimp hosts. This species can reach a length of 12 centimetres TL. It can also be found in the aquarium trade.