* Lobster: These crustaceans have large, powerful claws that they use to defend themselves and catch prey.
* Crayfish: Similar to lobsters, these smaller crustaceans also have strong claws.
* Scorpions: While not strictly aquatic, some scorpion species live near water and can even swim. They have powerful claws and a venomous tail.
* Sea anemones: These are not animals with claws in the traditional sense, but their tentacles have stinging cells that are used to capture prey.
* Octopus: These cephalopods have eight arms with suckers, but they also have a sharp beak that they use to bite.
* Sea Otter: These mammals don't have claws, but they have very strong paws with sharp claws used for opening shellfish.
To give you a more specific answer, I need more information. Could you tell me:
* What type of water does the animal live in? (Freshwater, saltwater, etc.)
* What size is the animal?
* What does the animal look like?
With more details, I can help you narrow down the possibilities!