Mud blenny Mud carp Mud catshark Mud darter Mud flathead Mud goby Mud reef-goby Mud sillago Mud skate Mud sleeper Mud sole Mud sunfish Mudbank filefish Mud-dwelling moray Muddy arrowtooth eel Muddy damsel Mudfish Mudminnow Mueller's flounder Mueller's rockskipper Mugura grenadier Muiron pipefish Muksun Mullet snapper Multibar citharine Multi-barred cardinalfish Multibarred shrimpgoby Multibarred triplefin Multicolor angelfish Multicolorfin rainbowfish Multicolour dottyback Multipore dwarf snailfish Multipore searsid Multispine damselfish Multispine giant stingray Multispine skate Multispotted goby Multispotted grouper Multispotted lanternfish Multi-thread dragonfish Mummichog Muna jawfish Munchskin skate Munda round ray Munk's devil ray Munro's hardyhead Mural goby Murasoi Muroranginpo Murray cod