Royal highhat Royal panaque Royal sprat Royal tetra Royal threadfin Ruaha lampeye Rubberlip grunt Rubberlip seaperch Rubbernose conger Rubble goby Rubinoff's triplefin Ruby cardinalfish Ruby Red Piranha Ruby tetra Rubyfish Rubynose brotula Rubyspot cardinalfish Rudd Rudderfish Rudis rattail Rudolf lates Ruffe Rufous coralgoby Rufus cardinalfish Rufus snake-eel Rugby hatchetfish Rummy-nose tetra Rüppell's scaldback Rush darter Rusi blenny Russell’s dragonet Russell's snapper Russell's wrasse Russet angelfish Russetfin topminnow Russian bitterling Russian river tule perch Rust corydoras Rust-banded wrasse Rusty angelfish Rusty blenny Rusty carpetshark Rusty Catshark Rusty Crawfish Rusty goby Rusty hind Rusty jobfish Rusty parrotfish Rusty snailfish Rusty spaghetti eel