The study looked at fish diversity and resources in the Nanguang River, a tributary of the upper Yangtze River. Researchers from Sichuan University and Xihua Normal University used field surveys to assess the status of fish populations in the river. They found that the Nanguang River has a high diversity of fish species, indicating a healthy aquatic ecosystem. The study also highlighted the importance of conservation efforts to protect the biodiversity of fish in the area.