Aquatic & Marine Animal Signs

Funny novelty aquatic and marine metal signs for pond keepers, lake lovers, reef tank fans, and ocean enthusiasts, with free shipping over $50 on orders from our NH studio.

Explore more: Fish & Aquarium Signs Reptile & Exotic Pet Signs Cat Metal Signs Funny Dog Signs for Every Breed Farm Animal Signs Best Sellers Bird Signs Wildlife Signs Compact Mirrors Art Mousepads and Desk Mats Animal Art Prints

Showing 25 - 38 of 38 products

Alligator Crossing yellow diamond caution sign, black alligator silhouette

three different sizes of square aluminum sign sizes, ranging from 6x6 inches to 12x12 inches.

Alligator Crossing Caution Sign

From $14.95

Jellyfish warning sign, distressed metal, property protected by a highly trained jellyfish, with trailing-tentacle jellyfish silhouette

Jellyfish warning sign, weathered aged finish, highly trained jellyfish joke with trailing-tentacle jellyfish silhouette

Jellyfish Warning Metal Sign

From $14.95

A yellow diamond-shaped road sign with a black silhouette of a hippopotamus.

Hippopotamus Crossing Caution Sign

From $14.95

Otter XING yellow diamond caution sign, black otter silhouette

Otter XING Caution Sign

From $14.95

Hippopotamus XING yellow diamond caution sign, black hippo silhouette with open mouth

Hippopotamus XING Caution Sign

From $14.95

Alligator XING yellow diamond caution sign, black alligator silhouette

Alligator XING Caution Sign

From $14.95

Otter Crossing yellow diamond caution sign, black otter silhouette

Otter Crossing Caution Sign

From $14.95

Giant Isopod warning sign, red WARNING oval, this property is protected by a highly trained Giant Isopod, with giant isopod silhouette

Giant Isopod warning metal sign, giant isopod silhouette beside bold red WARNING lettering, 'not responsible for injury or possible death'

Giant Isopod Deep Sea Metal Sign

From $14.95

Fish warning sign, red WARNING oval, this property is protected by a highly trained Fish, with fish silhouette

Fish warning metal sign, fish silhouette beside bold red WARNING lettering, 'not responsible for injury or possible death'

Highly Trained Fish Warning Sign

From $14.95

Lobsta warning sign, red WARNING oval, this property is protected by a highly trained Lobsta, with lobster silhouette

Lobsta warning metal sign, lobster silhouette beside bold red WARNING lettering, 'not responsible for injury or possible death'

New England Lobsta Metal Sign

From $14.95

Sea Turtle warning sign, red WARNING oval, this property is protected by a highly trained Sea Turtle, with sea turtle silhouette

Sea Turtle warning metal sign, sea turtle silhouette beside bold red WARNING lettering, 'not responsible for injury or possible death'

Sea Turtle Coastal Metal Sign

From $14.95

Sea Lion warning sign, red WARNING oval, this property is protected by a highly trained Sea Lion, with sea lion silhouette

Sea Lion warning metal sign, sea lion silhouette beside bold red WARNING lettering, 'not responsible for injury or possible death'

Sea Lion Metal Warning Metal Sign

From $14.95

Manatee warning sign, red WARNING oval, this property is protected by a highly trained Manatee, with manatee silhouette

Manatee warning metal sign, manatee silhouette beside bold red WARNING lettering, 'not responsible for injury or possible death'

Highly Trained Manatee Metal Sign

From $14.95

Barracuda warning sign, red WARNING oval, this property is protected by a highly trained Barracuda, with barracuda silhouette

Barracuda warning metal sign, barracuda silhouette beside bold red WARNING lettering, 'not responsible for injury or possible death'

Barracuda Metal Warning Sign

From $14.95

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For the people who know that the weirdest personalities often live in water. These aquatic and marine animal signs are made for fish keepers, pond people, lake lovers, ocean fans, aquarium hobbyists, and anyone who has ever looked at a bullfrog and thought yes, that creature absolutely needs an official warning sign.

Every sign in this collection is a novelty humor sign, not an actual safety or regulatory warning. They simply look official enough to post by the dock, the tank, the pond, or the boathouse where your highly trained otter has taken up residence.

All aquatic and marine signs are made in the USA and exclusive to Designs by Linda Nee. Each one is printed directly onto heavy gauge rust-proof aluminum using UV resistant ink, with no decals and no vinyl. Species covered span freshwater and saltwater: otters, sharks, cichlids, catfish, batfish, archerfish, plecostomus, hippos, anemone, clams, and bullfrogs, with more lurking in the deeper pages.

Signs come with pre-drilled mounting holes and are ready to hang straight out of the package for indoor or outdoor display. By the fish tank, on the boathouse wall, beside the backyard pond, along the dock, or anywhere your favorite aquatic creature deserves official recognition and a bit of authority.

The Shark Warning Sign, the Funny Otters Warning Sign, the Bullfrog Pond Warning Metal Sign, the Archerfish Tank Warning Sign, and the Funny Clam Warning Sign are strong picks for the water lover who has everything except the right sign on the wall.

Explore the full Animal Signs collection for more, visit Fish and Aquarium Signs for tank-specific species, browse Lake Monster Metal Signs for something with a little more legend, or check Most Loved to see what fellow aquatic enthusiasts keep coming back for.

Frequently Asked Questions

Are these real warning signs or novelty humor signs?
Every sign in this collection is a novelty humor sign, not an actual safety or regulatory warning. They are designed to look amusingly official while celebrating your specific aquatic creature, whether that is a shark, an otter, a bullfrog, or a clam with a strong personality.

What are the signs made from?
Each sign is printed directly onto heavy gauge rust-proof aluminum using UV resistant ink. There are no decals, no vinyl overlays, and nothing that peels or fades easily. The design bonds to the metal itself, making these signs suited for docks, patios, pool areas, and other outdoor and humid environments.

Can these signs be displayed outdoors near water?
Yes. The rust-proof aluminum and UV resistant ink make these signs well suited for outdoor display near ponds, docks, pools, lake cabins, and boathouses. Every sign arrives with pre-drilled mounting holes so you can hang it immediately without extra hardware.

Which aquatic and marine animals do you have signs for?
This collection includes sharks, otters, cichlids, catfish, batfish, archerfish, plecostomus, hippos, anemone, clams, bullfrogs, and more across freshwater, pond, and ocean species. All designs are exclusive to Designs by Linda Nee and made in the USA. Do not see your favorite aquatic animal? Reach out. There is probably one waiting in the wings.