weever

Weevers (or weeverfish) are 9 extant species of fishes of family Trachinidae, order Perciformes. They are long (up to 37 cm), mainly brown in color, and have poisonous spines on their first dorsal fins and gills. During the day, weevers bury themselves in sand, just showing their eyes, and snatch prey as it comes past, which consists of shrimp and small fish. Weevers are unusual in not having swim bladders, as do most bony fish, and as a result, sink as soon as they stop actively swimming. With the exception of T. cornutus from the southeast Pacific, all species in this family are restricted to the eastern Atlantic (including the Mediterranean). A tenth, extinct species, Callipterus speciosus, is known from the Monte Bolca lagerstätte of the Lutetian epoch.