Topmouth Gudgeon
Pseudorasbora parva
Topmouth Gudgeon is a small invasive cyprinid native to East Asia and now established across much of Europe and parts of Asia. It thrives in warm, still waters and is known for rapid spread and competition with native fishes.
Identification points
- Small, slender body with a relatively large eye and blunt snout
- Single dark stripe running from the snout through the eye to the tail base
- Small, upward-angled mouth and a forked tail with translucent fins
Habitat
Shallow, slow-moving or still freshwater habitats including ponds, ditches, canals, oxbows, reservoirs, and vegetated margins of lakes and lowland streams; often in warm, turbid water with dense cover.
Bait notes
Tiny pieces of worm, maggot, bread, dough, or small insect larvae can catch it; very small hooks and fine tackle are best. Small micro-jigs or bits of soft plastic may work where allowed, but it is usually targeted incidentally rather than as a game species.
Behavior
Opportunistic omnivore that feeds on zooplankton, insects, detritus, and fish eggs/larvae. It schools in the shallows and spawns repeatedly in warm months, often associating with dense vegetation or structure.
Caution
Do not move live specimens between waters; it is an invasive species in many regions and may be subject to local control rules. No major consumption hazard is widely noted, but check local regulations before harvesting or releasing.
Fishing notes
Use ultra-light tackle, small floats, and short casts to weed edges, margins, and shallow backwaters. Watch for quick, tentative bites and strike lightly; in invaded waters, local rules may restrict transport or use as bait.