This is an assessment for Poland, Estonia (Lake Vörtsjärv) and Latvia. In these countries pikeperch is released in closed lakes and rivers where it can be fished. Data on stock status is not available nor researched, instead the ecosystem is managed as a whole.
Gillnets don’t disturb the bottom. There is however often bycatch of other species.
There is a national management plan in play, this is followed and enforced. The whole ecosystem is taken into account in this plan.