Here’s one rather positive review from Vox.
A biochemist was consulted in the first movie, and he was asked to help again on this second movie. Pixar wanted to know how real fish behave before trying to animate them. Here’s a brief interview (from Nature):
A couple of parts of the interview I liked:
“Their questions were less philosophical than for Finding Nemo. It was less, ‘Do these things think?’, and much more, ‘How does it swim?’ “
“A young audience is much more sophisticated than you think, and a story informed by a lot of facts alerts them to the presence of real concepts. I got an e-mail from an eight-year-old about Finding Nemo, explaining that characters could not emerge from a whale’s blowhole if they were in its mouth, because there is no link between the trachea and the oesophagus.”
The word ichthyology means the study of fish. As you can see in the graph below, it’s probably not the most useful vocabulary to learn, but if you’re interested in fish — or in animating fish — you might add it to your vocab list.