Species learning profile
Brown trout
Salmo trutta
Brown trout (Salmo trutta) is a freshwater fish associated with river habitat in Europe. Individuals may remain in streams or migrate to sea as sea trout.
Your learning progress stays on this device.
At a glance
- Eau
- Eau douce
- Habitat
- Rivière
- Longueur maximale
- 140 cm
- Répartition
- Europe
- Famille
- Salmonidae
- Ordre
- Salmoniformes
Observe
How to identify Brown trout
- Individuals may remain in streams or migrate to sea as sea trout.
- Guide context: river habitat in Europe.
- Reported maximum length: 140 cm — capable of growing longer than many people are tall. Maximum is not the same as typical adult size.
Field note: color, size, and markings can change with age, sex, season, depth, and lighting. Use several traits together.
Place and pattern
Where it lives—and how it behaves
Habitat and range
This species is associated with river habitat across Europe. Flow, seasonal floods, connected side channels, and access to spawning reaches all shape its river habitat.
Behavior
Uses cover and low light to ambush prey
Food-web connections
What it eats and why it matters
Diet
Insects, crustaceans, and fish.
Ecological role
A flexible predator in cool-water food webs.
Remember
One fact worth keeping
Brown trout peut atteindre environ 140 cm et vit souvent près de Rivière.
Think like a conservationist
A conservation lens
River fish depend on connected water. Dams, blocked migrations, pollution, and altered flow can matter even when the channel still looks wet.
This habitat lens is not a current population-status assessment. Status can differ among regions and change as new assessments are published; follow the reference links and local fisheries or wildlife agencies for current decisions.
Recall
Quick knowledge check
Which habitat is most closely associated with Brown trout in this guide?
Keep exploring
References and further reading
Fishdle summarizes stable identification and ecology concepts in plain language. Taxonomy and population knowledge continue to change, so use primary assessments and regional authorities for conservation or management decisions.
Make connections