No, clownfish do not exclusively have 400 eggs.
Clownfish are known to lay eggs, but the number isn't fixed at 400. The number of eggs a clownfish lays can vary significantly. According to LiveScience, clownfish typically lay between 100 and 1,000 eggs in a single clutch. Therefore, while 400 eggs is a possible number, it's only one point within a wider range. The exact number depends on factors like the age and size of the female clownfish, as well as environmental conditions. They typically lay their eggs near their anemone, just like in "Finding Nemo."