Island trevally 
Ituglanis passensis 
Jaguar cichlid 
Japanese Leatherjacket 
Jewel damselfish 
Keeltail needlefish 
Keyhole Angelfish 
King angelfish 
Kryptopterus bicirrhis 
Kuhlia rupestris 
Kuiter's dragonet 
Kupang cardinalfish 
Kyphosus cinerascens 
Laced moray 
Lagoon damselfish 
Lagoon triggerfish 
Lahontan cutthroat trout 
Lake sturgeon 
Lamarcks angelfish 
Lane snapper 
Lantern bass 
Large whip goby 
Large-banded blenny 
Large-toothed cardinalfish