Aquatic & Marine Animal Signs

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.