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Anime and Manga
- Teacher Iruka in Jewelpet Sunshine is a pink dolphin who gets around inside a fish tank, which the students take in stride after being freaked out the first time.
- Fujimoto in Ponyo on the Cliff by the Sea is forced to take a back-mounted machine with him whenever he ventures onto dry land, as it carries a vat of salt water that he must spray around himself to keep himself humidified. Still, he is biologically human, which requires him to wear a bubble underwater.
- In the Tokyo Mew Mew spinoff manga Petite Mew Mew (an Alternate Universe in kindergarten), all the girls show characteristics of their infused animal DNA — in Lettuce's case, her lower half is a porpoise tail. She is always shown partially submerged in a body of water, such as a wading pool or a giant fishbowl.
- Aquaman has a special suit filled with water for missions on land. It ends up saving the life of Martian Manhunter in Tower of Babel.
- Prince Namor the Sub-Mariner can breathe on dry land, but he's a mutant. The other denizens of Atlanta have to wear water bowls when they're above the surface.
- A group of Atlantis characters popped up in The Savage Dragon from time to time, with aquatic "breathing" gear to use to go on land for an invasion. This was a Running Gag in which the gear always malfunctioned in someway, killing all of them.
- Sea Pony Lyra, an OC common in My Little Pony: Friendship Is Magic fics, tends to come with a matching metal bucket to rest in.
- Children of an Elder God has Ritsuko Akagi wearing a neck brace to circulate water over her gills after an incomplete transformation into a Deep One (they're naturally amphibious, but this was a special case).
Film — Animated
- Minion from Megamind is a piranha-like fish in a robotic gorilla suit.
- Fish Out Of Water from Chicken Little wears a scuba helmet filled with water in order to interact with Chicken Little and the others. The film's editor, Dan Molina, preformed the "voice" for Fish by vocalizing through a tube into a water cooler tank full of water.
- Gill, Deb and the other captives in the dentist's fish tank in Finding Nemo use the fact that they've been put in clear baggies of water while the tank is being cleaned to make their escape to the sea. This involves bopping the baggies forward through a building and across a busy roadway. Good news: they succeed. Bad news: they have no idea how to get out of the baggies.
Film — Live-Action
- Variation in Pirates of the Caribbean: At World's End. Negotiations are taking place on a sandbar, but since Davey Jones is cursed to be unable to set foot on land, he's standing in a big wooden bucket of seawater, with several others visible behind him.
- In the Hellboy films, psychic fish man Abe sometimes wears a water goggles and water tanks when he is out of his tank. The comics explain that this is more to keep him from drying out than to help him breathe; he has both lungs and gills.
Folklore and Mythology
- The kappa, a river-dwelling creature of Japanese folklore, has a deep depression in its head that is full of water, which is the source of its power. If you bow to it, it will bow back, spilling the water on its head and draining it of its power.
- Many mermaids in older stories will have a veil or cap on their heads, usually (but not always) red. It is thought to allow them to breathe underwater, and may actually have been inspired by the amniotic sac that envelops a fetus. Getting rid of it will often transform the mermaid in question into a regular human, and many human men will steal this MacGuffin for that purpose.
- In X: Farnham's Legend a Boron, the resident species of squid-people, is shown walking around a space station built for terrestrial species in a pressure suit filled with water.
- In Un Lun Dun, there's a character called Skool who walks around in a diver's suit full of water. Skool is a sentient school of assorted aquatic creatures, mostly fish. It's that kind of book.
- In One Hundred Years From Now, the book upon which Guest from the Future is based, one of the episodic characters is an alien aquatic horse moving around in a large walking aquarium.
- Downplayed in the Star Wars Expanded Universe, which notes on occasion that ships crewed by Mon Calamari are usually kept very humid. This is good for the amphibious Mon Cals, not so much for more humanlike species.
- In the Sweet Pickles children's book series, Fearless Fish wears this as she rides her motorcycle around the town.
- In The Secret of Platform 13, many magical creatures apply for the job as the Prince's nanny, including a mermaid who seemed to think she could get around the palace in a big tank of water.
- In Star Trek: The Next Generation the Benzites are a semi-aquatic race who have a special attachment to their uniforms which blows a fine mist in the direction of their faces on a regular basis so they can continue to breathe. A Star Trek: Deep Space Nine episode, "Apocalypse Rising", has a Klingon brag about killing a Benzite* Starfleet captain by ripping her breathing apparatus off.
- The Hath in the Doctor Who episode "The Doctor's Daughter" breathe a nutrient liquid, and have to wear a mask containing a flask of it while in Earthlike atmospheres.
- In a variation, the Smallville incarnation of Aquaman had to drink large amounts of water frequently to avoid drying out, and heat lamps weakened him severely. He could recover from exposure to the latter by being doused with water.
- The Far Side: One comic has a fish using a contraption like a diving suit with a line attaching it to a fishbowl. Another comic has two fish driving a wheeled fishbowl out of the ocean and onto a beach.
- One of the aliens in Big Bang Bar is a slug-like creature in a bottle of green liquid.
- Bob The Killer Goldfish from Earthworm Jim is a regular goldfish in a bowl who gets carried around by a musclebound cat minion.
- The Sergetti in the Space Empires series are an aquatic species that have established an intergalactic empire with their knowledge of crystalline technology. They build spaceships that carry the oceans of their homeworld into space with them.
- In Terraria, there is a literal Fish Bowl item that the player character can wear on his head as a vanity item. If it's worn as equipment (not solely for appearances), the character will start to drown. Having the character drink a Gills Potion at the same time, though, will allow him or her to breathe normally.
- World of Warcraft has aquatic vanity pets. There's the variety that can be on dry land (crabs, turtles and frogs), but fish or sea ponies float around in a water bubble.
- Star Control II has the Orz, who live in some form of liquid. Dialogue from other characters makes it clear that they wear airtight environment suits when visiting the Human Starbase.
- The Boron in the X-Universe utilize personal, water-filled space suits when on stations and ships belonging to the other races; they have no legs being squid-like, and they breath ammonia-rich water. In-game it's never seen as all Boron are shown on the bridge of their own ship, and come X Rebirth with its direct interactions, they're missing from the Albion system entirely.
- From the Timesplitters series, Robofish is a goldfish in a bowl supported by a robot body.
- Once in Two Lumps the Angry Fish goes after Snooch with a water-filled (and bubble-topped) tank.
- In Futurama, the Professor's rival, Wernstrom, makes one of these for his goldfish as his entry for the science symposium.
- Spongebob Squarepants
- An interesting example, Spongebob and Patrick actually CAN breathe in the air, but they instead need water lest they die of dehydration.
- At one point the characters use a glass dome filled with water to do a concert in a human stadium.
- Sandy is an inversion, being a land animal that survives underwater by wearing a suit full of air.
- The Cat in the Hat Knows a Lot About That! has a fish who travels with the group in a fish bowl.
- Klaus of American Dad! either uses a small glass filled with water or rolls around in a hamster ball filled with water.
- In It's a Trap!, the Family Guy parody of Return of the Jedi, the commander of the Rebel fleet is a fish (Klaus from American Dad!) that pilots a robot body from a water filled globe at the head.
- Dr. Wasabi from Chop Socky Chooks is a tiny shark who travels around in an astronaut-style suit filled with water.
- T-Ray and his mooks from Tiger Sharks are water-breathing creatures from a planet that dried up. They are now trying to conquer a watery planet; the one upon which the series take place. Since the other group of villains (and their occasional allies) cannot breathe water, they have used water filled suits at least once.
- Star Trek: The Animated Series episode "The Ambergris Element". At the end of the episode two Aquans (aliens who can only breathe water) are shown on the bridge of the Enterprise wearing water-filled helmets on their heads.
- Fishface from the most recent Teenage Mutant Ninja Turtles has both water mounted on his gills, as well as artificial legs.
- Ben 10: Omniverse has the pisceans who travel on land not wearing helmets, but suits that circulate water through them.
- Fishtronaut is an enviro-friendly animated mystery series in which Secret Agent Fishtronaut (named so because he's a fish who flies around in an astronaut suit) explores the world's many mysteries above and below water in a unique way.
- My Gym Partner's a Monkey:
- Bull Sharkowski wears a headset over his gills in order to breathe above water.
- Coach Gills from the same show, a goldfish whose bowl is wheeled around by the assistant coach.
- One of the two animated Flash Gordon series had underwater humanoids use these when riding jetskis. After being implanted with an Artificial Gill against his will, Flash has to knock one out and loot his helmet.