It's been nearly 10 years since Finding Nemo created a sensation at theaters and pet stores. After the movie debuted in 2003, demand for real "Nemos" took off.

"People wanting clownfish, not necessarily knowing that it's marine life or saltwater fish," Don Spaeth, an aquatic-life expert, said.

The costs of caring for saltwater fish is higher - which is the type info aquatic-life experts like Spaeth will be doling out with the release this weekend of Finding Nemo in 3D.

For example, the stuff put in water to make it safe for us to drink is not so good for fish.

"You can use your regular tap water, but you're going to need to add products like a de-chlorinator that's going to take chlorides and chlorinates out of the water to make that water safe for the fish to live in," Spaeth said.

Overfeeding fish also results in unsafe water because uneaten food drops to the bottom and reduces water quality. He says be warned - it's no easier to tell a child about the passing of a fish than for, say, a puppy.

"A fish - by any means - takes a lot less time than taking the puppy out to walk and to feed," Spaeth quantifies.

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