For decades, catch-and-release mortality (CRM) has often been treated as a single fixed percentage—frequently cited as nine percent. But Nelson’s work challenges that simplification, arguing that CRM is not a constant. Instead, mortality likelihood can shift depending on salinity and water temperature, the type of fishing gear used, where the hook is placed, and how quickly and carefully fish are handled.

These variables matter because physiology responds to stress and injury in complex ways. In field conditions, fish may experience delayed recovery, oxygen limitations, or physical damage that varies with season and tactics. Angler experience can also influence outcomes, including how long fish are out of water and whether they are supported properly during release.

Nelson’s study is designed to produce a more precise estimate of CRM across all seasons of the year. Rather than relying on generalized assumptions, the project aims to quantify how real-world combinations of conditions translate into mortality risk for striped bass after release.

The goal is not only to refine ecological understanding, but also to improve fisheries management decisions. When managers use overly static mortality values, they may misjudge population impacts and set regulations that either underprotect the species or unnecessarily constrain fishing opportunities.

Equally important, better CRM estimates can reduce avoidable economic repercussions. Coastal communities and recreational fishing industries depend on sustainable stock assessments—especially when seasonal fishing pressure fluctuates.

Nelson is conducting this research with funding from the American Saltwater Guides Association. The support totals $152,708, with the project beginning in June 2026 and running through late August 2028.

As Nelson’s findings progress, they may help shift catch-and-release policies toward condition-specific risk models—an approach more consistent with how ecosystems actually behave.

Subject of Research: Catch-and-release mortality (CRM) in striped bass, and how environmental and human factors affect post-release mortality
Article Title: Striped Bass CRM May Vary Far More Than the “Nine Percent” Rule
Web References: https://www.gmu.edu/masonnow ; https://www.gmu.edu/about
References: American Saltwater Guides Association (funding)
Image Credits: Not provided
Keywords: striped bass, catch-and-release mortality, fisheries management, ecology, angler practices, salinity, temperature, gear type, hooking location