Gobies have the pelvic fins fused creating a circular suction-cup.  This is used to cling firmly to hard surfaces to avoid being washed away by surge or climb up streambeds and waterfalls in the case of a few freshwater species.  Eggs of freshwater gobies are washed into the ocean to hatch before returning to any stream soon afterward.  Sleepers, sometimes assigned to the Family Eleotridae, lack fused pelvic fins.

WHITESPOTTED FRILLGOBY

COCOS FRILLGOBY

EYEBAR GOBY

HAWAIIAN SHOULDERSPOT GOBY   

Coryphopterus duospilus

TWOSPOT SANDGOBY

HAWAIIAN SHRIMPGOBY

HALFSPOTTED GOBY

BARRED TIDEPOOL GOBY

Eviota epiphanes

DIVINE PYGMYGOBY

Eviota susanae 

SUSAN'S PYGMYGOBY

ONESCALE DWARFGOBY

Trimma taylori

TAYLOR'S DWARFGOBY

RED EARTH DWARFGOBY

PETITE GOBY

GOLDEN GOBY

MICHEL'S GHOSTGOBY

SEAWHIP GOBY

WIRE-CORAL GOBY

Awaous guamensis

COMMON STREAMGOBY   'O'OPU NAKEA

FLATHEAD STREAMGOBY    'O'OPU AKUPA

BICOLORED STREAMGOBY   'O'OPU ALAMO'O

Nuptial male

BLACKBAR STREAMGOBY    'O'OPU NANIHA

BLACKBARRED GOBY

BLUESTRIPE DWARFGOBY

TWOSTRIPE GOBY

BLUESTREAK GOBY

SIGNAL SANDGOBY

ORNATE SHRIMP GOBY

YELLOWSPOTTED SHRIMPGOBY

RANDALL'S SHRIMPGOBY

REDMARGIN SHRIMPGOBY

STEINITZ' SHRIMPGOBY

BARRED SHRIMPGOBY

BLACKEYE GOBY

LONGJAW MUDSUCKER

BLUEBANDED GOBY

ZEBRA GOBY

BANDED CLEANERGOBY

REDHEAD GOBY

REDLIGHT GOBY