freshwater
Gudgeon
Gobio gobio
Elongated, slightly flattened cylindrical body with a subterminal mouth equipped with small barbels. Large scales, brownish-green back with darker spots or blotches forming a lateral stripe, and a silvery-white belly. Fins are transparent or lightly spotted, with a forked tail fin.
- Habitat
- Inhabits clear, fast-flowing streams, rivers, and clean…
- Size & weight
- Typically ranges from 10 to 15 cm in length, with a maxi…
- Diet
- Benthic invertebrate feeder, consuming small aquatic ins…
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Physical characteristics
Elongated, slightly flattened cylindrical body with a subterminal mouth equipped with small barbels. Large scales, brownish-green back with darker spots or blotches forming a lateral stripe, and a silvery-white belly. Fins are transparent or lightly spotted, with a forked tail fin.
Habitat & distribution
Inhabits clear, fast-flowing streams, rivers, and clean lakes with sandy or gravelly bottoms. Native to Europe and parts of northern Asia.
Behavior
Gregarious and social, typically found schooling near the riverbed. They are primarily diurnal and active during daylight hours.
Diet
Benthic invertebrate feeder, consuming small aquatic insects, crustaceans, worms, and organic detritus found on the substrate.
Reproduction
Spawns in the spring (typically April to June) in shallow, gravelly areas where females lay adhesive eggs on vegetation or stones, which hatch within two weeks.
Ecological role
Serves as an important prey species for larger predatory fish and aquatic birds. Acts as a bottom feeder that helps process organic matter.
Similar species
Spined loach or stone loach, but gudgeons can be distinguished by their prominent barbels, larger scales, and lack of worm-like body patterns.
Identification tips
Look for the small barbels at the corners of the mouth, the elongated spotted body, and a preference for bottom-dwelling in gravelly freshwater streams.
Interesting facts
Gudgeons are sensitive to water pollution and are often used as bioindicators to assess the ecological health of freshwater river systems.