Does harvest of the European grayling, Thymallus thymallus (Actinopterygii: Salmoniformes: Salmonidae), change over time with different intensity of fish stocking and fishing effort?

https://www.researchgate.net/publication/339615345_Does_harvest_of_the_European_grayling_Thymallus_thymallus_Actinopterygii_Salmoniformes_Salmonidae_change_over_time_with_different_intensity_of_fish_stocking_and_fishing_effort