Specialises in well vegetated ponds, lakes, canals etc.

Frequently in woodlands.

Will tolerate acidic waters.

Common across most of England apart from the south-west and the far north, although its distribution is expanding. Southerly and easterly distribution in Wales. The species reached Scotland in 2003 and has been found at a few southerly sites.

May be confused with other Darter species, the most common other species being the Common Darter.

Ruddy Darter can be distinguished by:

• Black legs
• Black line marking extends part way down the side on the frons (face).
• Male: blood-red colouration and club-shaped abdomen.