Research levels
| Level | Unlocks | Research gate | Researched at |
|---|---|---|---|
| Level 1 | Fertility Level 1 (+15% fertility) | Habitat or exhibit and Research Centre | |
| Level 2 | Brown Trout Fact Sheet | Habitat or exhibit and Research Centre | |
| Level 3 | Release groups and release to the wild | Habitat or exhibit and Research Centre | |
| Level 4 | Fertility Level 2 (+30% fertility) | Before this level: an Observation Network (Observation Platform) in Sweden Reserve and this species released in Sweden Reserve | Wildlife Reserve |
