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- Wahoo Fish
- Walking Catfish (Brackish water species)
- Walking Shark
- Wallago Catfish (Brackish species)
- Warty Anglerfish
- Warty Frogfish
- Warty Sea Cucumber
- Warty Sea Slug
- Warty Stargazer
- Warty Venus Clam
- Wave-Surf Clam
- Waved Albatross (Marine bird)
- Waved Whelk
- Wavy-Lined Shrimp Goby
- Weasel Shark
- Weedy Scorpionfish
- Weedy Seadragon
- West African Guitarfish
- West Indian Sea Egg (Type of sea urchin)
- Western Blue Groper
- Western Clingfish
- Western King Wrasse
- Western Numbfish
- Whale Shark
- Whale Fish
- Whale Lice (Parasitic crustacean on whales)
- Whale Shark Remora
- Whalebone Barnacle
- Whiptail Gulper
- Whiptail Ray
- Whiptail Stingray
- Whiptail Lanternfish
- Whipfin Silverbiddy
- Whiskered Tern (Marine bird)
- White Anglerfish
- White-Banded Cleaner Shrimp
- White-Finned Synodontis (Brackish species)
- White Margate Fish
- White-Spotted Bamboo Shark
- White-Spotted Jellyfish
- White-Spotted Pufferfish
- White-Spotted Seahorse
- White-Barred Rubberlip
- Whitebelly Catshark
- Whitebait (Small schooling fish)
- Whitefin Hammerhead Shark
- Whitefin Trevally
- Whitefish (Some species enter brackish water)
- Whiteleg Shrimp
- Whitetip Reef Shark
- Whiting Fish
- Widemouth Blindcat (Deep-sea fish)
- Wide-Streaked Pipefish
- Wiggly Lanternshark
- Wobbegong Shark
- Wolf Eel
- Wolf Fish
- Wolverine Clingfish
- Wrasse
- Wreckfish
- Wrymouth Fish
