A new study has found that what was once thought to be a single species of critically endangered grouper is actually two distinct species. The finding, published in the journal Molecular Ecology, has important implications for the conservation of these threatened fish.

The two species, now known as the black grouper (Epinephelus nigritus) and the brown grouper (Epinephelus fuscoguttatus), were previously considered to be a single species, Epinephelus nigritus. However, DNA analysis has revealed that the two fish are genetically distinct and have different evolutionary histories.

The black grouper is found in the waters of the western Indian Ocean, while the brown grouper is found in the waters of the central and eastern Indian Ocean. Both species are critically endangered due to overfishing and habitat loss.

The discovery of two distinct species of grouper has important implications for the conservation of these fish. It means that conservation efforts need to be tailored to each species' specific needs and distribution. For example, the black grouper may require more protection in the western Indian Ocean, while the brown grouper may require more protection in the central and eastern Indian Ocean.

The study also highlights the importance of DNA analysis in conservation biology. DNA analysis can help to identify new species and understand the genetic diversity of threatened populations. This information can then be used to develop more effective conservation strategies.

"The discovery of two new grouper species is a significant finding that will help us to better protect these critically endangered fish," said study lead author Dr. Luiz Rocha of the California Academy of Sciences. "DNA analysis is a powerful tool that can help us to understand and conserve the world's biodiversity."