Krefft's smooth-head Krefft's snaggletooth Kreiser’s Killifish Krempf's flounder Kriete's tonguefish Krishna carp Krobia Kroyer's deep-sea angler fish Krynicki's loach Kuban barbel Kuban long-barbelled gudgeon Kuban's nase Kudersky parketnik Kuiter's damselfish Kujaku Koi Kukumai Kukwari sea catfish Kulbicki’s pipefish Kulbicki's triplefin Kululu Kumakuma Kumaon snowtrout Kumonryu Koi Kuna Goby Kunapari Kunar snowtrout Kupang cardinalfish Kupang pony fish Kura barbel Kura bleak Kura chub Kura goby Kura gudgeon Kura loach Kura nase Kura shad Kurchatov's notoliparis Kuria labeo Kurobuchi tensu Kurogarei Kuronuma's whiptail Kuro-sabafugu Kurt's coralblenny Kuschakewitsch loach Kutubu hardyhead Kutubu tandan Kutum Kwangtung skate Kyushu bitterling