Publications by authors named "Fiona D Johnston"
Fish stocking and harvest regulations are frequently used to maintain or enhance freshwater recreational fisheries and contribute to fish conservation. However, their relative effectiveness has rarely been systematically evaluated using quantitative models that account for key size- and density-dependent ecological processes and adaptive responses of anglers. We present an integrated model of freshwater recreational fisheries where the population dynamics of two model species affect the effort dynamics of recreational anglers.
View Article and Find Full Text PDFManaging fisheries resources to maintain healthy ecosystems is one of the main goals of the ecosystem approach to fisheries (EAF). While a number of international treaties call for the implementation of EAF, there are still gaps in the underlying methodology. One aspect that has received substantial scientific attention recently is fisheries-induced evolution (FIE).
View Article and Find Full Text PDFArticle Synopsis
- The bull trout population in Lower Kananaskis Lake experienced a significant recovery due to zero-harvest regulations, leading to a 28-fold increase in adult fish over ten years.
- Researchers studied how life-history traits adapted during recovery, noting that increased density changed growth patterns and reproductive behaviors, with differences observed between male and female fish.
- The findings highlight that while the population showed resilience and adaptability, it did not fully recover from earlier overexploitation, emphasizing the need for careful management to avoid potential vulnerabilities in size-based regulatory practices.