The Alder fly is a large, sluggish insect often found on vegetation near to water. The larvae are aquatic carnivores that live in the silt at the bottom of ponds and slow-flowing rivers. Adults are seen in early summer, emerging in large numbers and living for just for a few days in order to mate. Mating takes place at night and the females lay their eggs on overhanging vegetation. The larvae hatch and drop into the water where they develop over one to two years.
How to identify
Adult Alder flies are blackish-brown, with dark, lacy wings which they fold in a tent-like manner along the length of their body. They are distinguished from stoneflies by the lack of any 'tail' bristles.
Did you know?
The Alder fly is one of the most common aquatic invertebrates to be found in silty ponds.
How people can help
The Wildlife Trusts manage many wetland nature reserves for the benefit of the wildlife they support. You can help by supporting your local Trust and becoming a member; you'll find out about exciting wildlife news, events on your doorstep and volunteering opportunities, and will be helping local wildlife along the way.
