These fish are born female & later become male; fishing may be changing them at molecular level

Pearly razorfish may be undergoing molecular changes due to intense fishing pressure, according to a new study. While researchers found no significant alterations in the fish's DNA itself, they did detect differences in DNA methylation. This epigenetic process influences how genes operate, suggesting that fishing could impact gene expression without changing the underlying genetic code.

The study also highlighted the benefits of marine reserves. These protected areas appear to foster the preservation of larger, older fish. Furthermore, marine reserves contribute to maintaining higher levels of genetic diversity within fish populations.

These findings suggest that fishing practices could have subtle yet significant effects on fish populations beyond simple population size reduction. The role of epigenetics in adaptation to environmental pressures like fishing warrants further investigation.