Murky Amazon waters cloud fish vision

Cichlids are a remarkably diverse family of fish, with many African freshwater species known for their incredible visual system. These cichlids' complex vision results from a diverse array of visual pigment proteins in their retinas: while humans have the genes to produce three of these proteins (called opsins), many cichlids have seven. Each African cichlid species produces a specific suite of opsin proteins that matches well with the light spectrum of their environment.

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