What you see isn't always what you get: On how anglers' fish stock perceptions are influenced by motivations, satisfaction and engagement.

Recreational anglers collectively spend a great amount of time on fishing activities. While being out fishing, these anglers perceive various components of aquatic ecosystems, allowing them to accumulate knowledge of the ecological status of the system and the fish they are targeting in it. Such fishers' ecological knowledge (FEK) is increasingly being recognized as a valuable source of information in fisheries research and management, but it has also been criticized for a lack of accuracy. People's perceptions of their environment are shaped by a variety of psychological and environmental factors, and the same is expected for anglers' perceptions of fish stocks and the resulting FEK. This study assessed anglers' perceived change in salmon and sea trout stocks at the Mörrum river in Sweden, comparing the year that they first fished there to the present (2019). In addition, effects on these perceptions of the anglers' motivations to fish, satisfaction with catches, and their engagement with this fishery were examined. The majority of the respondents perceived a negative trend for both species, even when the reported total catches during the year they first fished at Mörrum were lower than the present catches. Binomial regression models indicated significant influences of engagement at Mörrum on the anglers' stock trend perceptions. The results of this study emphasize the importance of understanding different individual angler characteristics when collecting and interpreting FEK. Moreover, the fact that anglers with a longer history at Mörrum had a more negative perception overall, regardless of actual stock status in their first year in this fishery, suggests the occurrence of the shifting baseline syndrome in recreational fisheries. Therefore, the prevailing narrative on stock trends and its effect on angler perceptions should be considered when using FEK. • Overall angler perceptions of salmon and sea trout stocks were negative. • Accuracy of perceptions was higher in satisfied and catch-oriented anglers. • More engaged anglers (length and intensity) had more negative perceptions. • Engagement did not influence accuracy [ABSTRACT FROM AUTHOR]