Here is the organizer Stäkets SF invitation with important info:
https://distriktetstockholm.se/onewebmedia/Dmg%C3%A4ddainbjudan2022_rev_1.pdf

See the sport anglers' rules for the pike category. https://www.sportfiskarna.se/portals/sportfiskarna/Regler%20Gadda%2020211202.pdf