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- Haddock
- Hagfish
- Halfband Snake Eel
- Halfbeak Fish
- Halibut
- Halloween Hermit Crab
- Hammerhead Shark
- Harbor Porpoise
- Harbor Seal
- Hardhead Catfish
- Harlequin Filefish
- Harlequin Shrimp
- Harp Seal
- Hawksbill Sea Turtle
- Hawkfish
- Hawaiian Cleaner Wrasse
- Hawaiian Monk Seal
- Hawaiian Squirrelfish
- Hector’s Dolphin
- Helmet Crab
- Helmet Jellyfish
- Helmet Urchin
- Herring
- Hickory Shad
- High Hat Fish
- Hinge-Beak Shrimp
- Hogfish
- Hoki Fish
- Holothurian (Sea Cucumber)
- Horn Shark
- Horse Mackerel
- Horse-eye Jack
- Horseshoe Crab
- Houndshark
- Humuhumunukunukuapua’a (Reef Triggerfish)
- Hundred-Fathom Jellyfish
- Hydroid Jellyfish
- Hydrozoa (a class of tiny marine animals related to jellyfish)
- Hypselodoris (a genus of colorful sea slugs)
