Från Luke.fi: WWF recommends rainbow trout farmed in Finland for consumers
WWF has produced recommendations that guide consumers towards sustainable consumption of fish species.Species have been classified into green, yellow and red categories. Species on green are recommended, on yellow to be consumed prudently, and on red avoided. Rainbow trout that is farmed in Finland is on the green category (www.wwf.fi/kalaopas/laji/kirjolohi/, 29.6.2019). The categories are determined by the estimated environmental impacts of the species.