Species learning profile
Ide
Leuciscus idus
Ide (Leuciscus idus) is a freshwater fish associated with river habitat in Europe. Older ide may shift from eating invertebrates to hunting small fish.
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Previously featured in Fishdle
At a glance
- Water
- Fresh water
- Habitat
- River
- Maximum length
- 100 cm
- Range
- Europe
- Family
- Leuciscidae
- Order
- Cypriniformes
Observe
How to identify Ide
- Older ide may shift from eating invertebrates to hunting small fish.
- Guide context: river habitat in Europe.
- Reported maximum length: 100 cm — up to about the length of a guitar. 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
Moves between river channels and floodplains
Food-web connections
What it eats and why it matters
Diet
Insects, crustaceans, plants, and fish.
Ecological role
Connects seasonal floodplain food webs.
Remember
One fact worth keeping
Older ide may shift from eating invertebrates to hunting small fish.
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 Ide 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