1. The most common fish color after 200 years will be the darker color, as it provides better camouflage in the muddy environment.
2. This can be predicted based on natural selection, as fish with better camouflaged colors are more likely to survive and reproduce in the muddy pond.
3. As the darker-colored fish reproduce and pass on their genes, the population will shift towards having more individuals with the advantageous camouflage coloration, resulting in the majority of fish in the pond being dark-colored after 200 years.