Adaptation of the eyes of grass puffer (Takifugu niphobles) to the riverine and marine environments

Since fish inhabit heterogeneous light environments, fish vision is a prime example of adaptive evolution. Many marine fish species migrate to rivers, but little is known about whether these species switch their vision when inhabiting rivers or adapt their vision to the environment of both rivers and the sea. Grass puffer (Takifugu niphobles) is a marine fish species frequently migrating to rivers. In this study, we investigated grass puffers from riverine and marine populations and analyzed the gene expression in their eyes.