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- Kakila Fish
- Kanduli Catfish
- Kawakawa Tuna
- Kelp Bass
- Kelp Blenny
- Kelp Crab
- Kelp Greenling
- Kelp Perch
- Kelp Rockfish
- Kelp Snailfish
- Kelp Wrasse
- Kemp’s Ridley Sea Turtle
- Kentucky Crayfish
- Keyhole Limpet
- Keyhole Sand Dollar
- Kidako Moray Eel
- Kilpatrick Perch
- King Angelfish
- King Barracuda
- King Crab
- King Mackerel
- King Ragworm
- King Snapper
- King Threadfin
- Kingfish (Yellowtail Amberjack)
- Kiwa Crab (Yeti Crab)
- Kiwi Cardinalfish
- Kiwi Clingfish
- Kiwi Wrasse
- Knifejaw Fish
- Knifefish (Brackish-tolerant species)
- Knobbed Prawn
- Knobbed Starfish
- Knobbed Whelk
- Kob (a type of Drumfish)
- Koi (some species tolerate brackish water)
- Korean Angel Shark
- Korean Eelpout
- Korean Flounder
- Korean Rockfish
- Korean Sandfish
- Kowari Goby
- Kraken Octopus (mythological, but inspired by real giant squids)
- Kribensis Fish (brackish-tolerant species)
- Krill (tiny crustaceans, vital to marine food chains)
- Kuhlia Mugil (Brackish-water fish)
- Kuhli Loach (found in estuaries)
- Kwangtung River Loach (found in brackish waters)
- Kyphosus Bigeye (Sea Chub species)
- Kyphosus Sectatrix (Bermuda Chub)