An interesting comparison, (at least to me) are the cichlids of the deep clear rift lakes in Africa, where males of many species are striking blue.
This helps camouflage these cichlids from aerial predators, above, but presents (from the side), obvious great views for females.

We seldom see this type deep blue in New World Cichlid.
Riverine and shallow (in comparison) lake cichlids need different camouflage in this area of the world.
Take Herichthys species like carpintus.
From the side, and underwater males are easily spotted by females.

But from above, where most cichlid predation originates, in shallow more turbid water, the carpintus patterns make them much harder to see.

In the pic above, there are 3 adult Herichthys carpintus