LEIOGNATHIDAE (PONYFISHES OR SLIPMOUTHS)
Slipmouths are small, carnivorous fishes that occur in schools
over shallow, inshore, muddy or sandy bottoms. Their bodies
are greatly compressed and covered with minute scales and a thick
layer of mucus; their mouth can be thrust out to grab prey. An
organ near the esophagus contains luminescent bacteria. They
are considered a good foodfish.
Leiognathus equulus (Forsskål)
(Common Slipmouth; Sapsap)
SL: to 22 cm, usually smaller (photo: 15.6 cm SL, Agana, 1 m)
This is perhaps the most common of 2 to 3 species 6f slipmouths
known from Guam. It occurs in schools over muddy-bottomed
inner lagoon, estuarine, and brackish waters and feeds on small
benthic invertebrates and fishes.
INDO-PACIFIC: Red Sea to Samoa, n. to the Ryukyus, s. to New Caledonia.