FishEurope

Brown Trout

A plain-looking but much-loved river fish that suits outdoor ponds in cold climates.

1 min read · Care guide

ScreenshotBrown Trout
Brown Trout in Planet Zoo 2

Key requirements

WaterFresh water
HabitatRiver-style tank or outdoor pond

Tank set-up

  • River-style freshwater tank with dirt, not sand, on the bottom
  • Rocks, roots and plants
  • Room to swim; a two-level tank with a little waterfall looks great

Keeper tips

  • Brown trout and koi are tough enough for outdoor ponds in cold climates.
  • A big trout tank with windows to the outside feels like a real river exhibit.

Wildlife reserve & release groups

Part of the Scottish Highlands reserve species list.

How release groups work →

Full brown trout care guide

1 min read · Updated 2026-11-07

The brown trout is a plain-looking river fish that a lot of players love anyway. It's tough, it suits cold climates, and it's one of the species you'll release into the Scottish Highlands reserve.

Water

  • Fresh water
  • A river-style tank or outdoor pond

Building a trout habitat

  • Use dirt on the bottom, not sand. This is a river fish.
  • Add rocks, roots and river plants.
  • Give them room to swim.

Two-level trout tank

A great build is a two-tier trout habitat: two separate tanks stacked on top of each other, with a little waterfall between them. Each tank needs its own staff door. Water effects and ripples make it look like a real river. Check the ripple direction matches the flow.

Outdoor pond

In a cold climate, outdoor tropical tanks aren't practical (temperature, leaf litter, salinity). Brown trout and koi are tough enough for an outdoor pond instead. It's a nice way to bring the aquarium outside.

Mixed habitats

Brown trout can share a habitat with common rudd, Eurasian beavers and Eurasian bitterns in a European river habitat. That kind of mixed river looks great on a temperate map.

Releasing trout

Brown trout are on the Scottish Highlands species list. In career mode you'll be asked to release brown trout groups as one of the objectives. Missing brown trout is a common reason a Highlands or European reserve is a species short.

Tips

  • A big trout tank with windows to the outside feels like a real river exhibit.
  • Put an education board about freshwater habitats nearby. Guests rarely think about river fish.