Common Stonefly

Scientific Name: Plecoptera (Order level identification)

Order & Family: Order Plecoptera; families may vary (likely Perlidae or Pteronarcyidae based on size)

Size: Generally ranges from 1/4 inch to 2 inches (roughly 6mm to 50mm) depending on the species.

Common Stonefly

Natural Habitat

Found near clean, fast-moving freshwater streams and rivers; adults are terrestrial and often found on nearby vegetation or rocks.

Diet & Feeding

Nymphs eat algae, detritus, or other aquatic insects; adults have short lifespans and may eat algae or not feed at all.

Behavior Patterns

Stoneflies go through incomplete metamorphosis. They are poor fliers and are typically most active at night or during twilight. They are highly sensitive to water pollution.

Risks & Benefits

Poses no risk to humans as they do not bite or sting. They are beneficial as vital bioindicators of water quality and serve as a significant food source for fish.

Identified on: 3/22/2026