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- Labyrinth Fish
- Lace Coral
- Lace Jellyfish
- Laced Moray Eel
- Lagoon Blenny
- Lagoon Goby
- Lagoon Triggerfish
- Lahille’s Bottlenose Dolphin
- Lake Sturgeon
- Lamprey
- Lanternfish
- Largehead Hairtail
- Largehead Sea Robin
- Largescale Flounder
- Largescale Stoneroller
- Largescale Sucker
- Largescale Tripletail
- Largemouth Blenny
- Largemouth Triplefin
- Leather Bass
- Leather Coral
- Leatherback Sea Turtle
- Leathery Sea Star
- Leaf Scorpionfish
- Leafy Seadragon
- Leaping Blenny
- Leaping Mullet
- Leopard Blenny
- Leopard Flounder
- Leopard Moray Eel
- Leopard Pufferfish
- Leopard Seal
- Leopard Shark
- Lesser Electric Ray
- Lesser Lantern Shark
- Lesser Spotted Dogfish
- Lettuce Coral
- Lettuce Sea Slug
- Libinia Crab
- Limpet
- Lingcod
- Lined Butterflyfish
- Lined Seahorse
- Lined Sole
- Lionfish
- Little Tunny
- Lizardfish
- Lobed Comb Jelly
- Lobed Star Coral
- Lobed Sunfish
- Loggerhead Sea Turtle
- Longarm Octopus
- Longbeard Rockfish
- Longbill Spearfish
- Longfin Bannerfish
- Longfin Escolar
- Longfin Grouper
- Longfin Mako Shark
- Longfin Pike
- Longfin Sanddab
- Longfin Smelt
- Longfin Trevally
- Longhorn Cowfish
- Longjaw Bonefish
- Longjaw Mudsucker
- Longnose Batfish
- Longnose Butterflyfish
- Longnose Chimaera
- Longnose Hawkfish
- Longnose Lancetfish
- Longnose Puffer
- Longnose Sawshark
- Longnose Skate
- Longnose Sucker
- Longsnout Seahorse
- Longspine Snipefish
- Lookdown Fish
- Lophiiformes (Anglerfish species group)
- Lowfin Moray Eel
- Lumpfish
- Luminous Lanternfish
- Luminous Shark
- Lungfish (some species tolerate saltwater conditions)