Nicaraguan mosquitofish Nichol's lanternfish Nichols' worm eel Niebuhr’s goatfish Nielsen's catetyx Nielsen's mudbrotula Nielsen's righteye flounder Niger barb Niger hind Niger tetra Nigerian fangtooth pellonuline Nigerian tonguesole Night aulonocara Night sergeant Night shark Night smelt Nightfish Nightmare dreamer Niji-kajika Nijssen's Hypopygus Nikolay's lanternfish Nile bichir Nile killifish Nile perch Nile tilapia Nilgiris barb Nilsson's pipefish Ninebar prawn-goby Nineline goby Ninespine batfish Ninespine stickleback Ningu Ninja lanternshark Nisus Hawkfish Nkhomo-benga peacock Nkupe Noble goby Noble lampfish Nocturn goby Nocturnal pearlfish Noline scorpionfish Nonbanded whipfin mojarra Non-parasitic lamprey Noodlefish Nordenskjold's bigscale Norfolk cardinalfish Norin goby Norman's lampeye Norman's lanterrnfish Norman's rockfish