Will the movie finding Nemo make people want to conserve marine species or exploit them?

It really depends on the person, really. Some people will want to conserve marine species, turtles, or anything shown in the moving; while other people will want to exploit them.
Evidence has already shown that some pet stores have bought up the type of fish that Nemo and dory are, putting them in more danger in their natural habitats.

The moths will eventually become extinct