Singlespot dwarfgoby Singlespot frogfish Singlespot topminnow Single-striped cardinalfish Singular bannerfish Siphonfish Sirajo Six-band grenadier Sixband hawkfish Six-banded tiger barb Sixbar angelfish Sixbar distichodus Sixbar grouper Sixbar panchax Sixbar wrasse Sixblotch hind Sixfinger threadfin Sixgill hagfish Sixgill stingray Sixline wrasse Six-lined prickleback Sixplate sawtail Sixray corydoras Six-spined leatherjacket Sixspot goby Six-spot prickleback Sixstrap grubfish Skadar gudgeon Skilfish Skilletfish Skilletskate Skinnycheek lanternfish Skipjack shad Skipjack trevally Skipjack tuna Skipper halfbeak Skulpin Skunk botia Skunk clownfish Skunk corydoras Sky emperor Sky-blue killi Skygazer shiner Slabrock darter Slackwater darter Sladen's hatchet fish Slantband Wrasse Slantbrow batfish Slantlip eel Slashcheek goby