Rudd identification and the difference between rudd and roach

In this guide

1. Compare the mouth and fin positions
2. Follow the feeding height

A partly submerged fish with red fins is easy to call a roach. With rudd, two features are more useful than the colour: the direction of the mouth and where the dorsal fin begins relative to the pelvic fins.

Compare the mouth and fin positions

1. Look at the mouth from the side. A rudd’s mouth angles upwards, a useful shape for taking insects at the surface.
2. Find the paired pelvic fins underneath the body. On a rudd, their bases are ahead of the start of the dorsal fin. On a typical roach, the dorsal fin starts roughly above them.
3. Use colour as a supporting clue. A golden flank and bright red fins fit rudd, but young fish and hybrids can make a colour-only identification unreliable.

Follow the feeding height

In a permitted swim on a vegetated canal or stillwater, watch the margins for small surface dimples. If you see fish taking items high in the water, try a small piece of bread or another permitted bait at that level. Record the mouth and fin features separately from feeding behaviour. A ring on the surface tells you where to look, but several species can make one.