Stonefly

Natural Habitat

Near clean, oxygen-rich running water such as rivers and streams; commonly found on nearby rocks, logs, or vegetation.

Diet & Feeding

Nymphs are typically herbivores or detritivores, feeding on decaying leaf matter or algae. Adults often do not feed at all or may consume soft plant matter and lichen.

Behavior Patterns

Stoneflies have an aquatic larval stage that can last several years. They are poor fliers and are usually seen crawling near water edges. They are highly sensitive to water pollution and serve as environmental indicators.

Risks & Benefits

They are harmless to humans and do not bite or sting. They are highly beneficial to ecosystems as a vital food source for trout and other fish, and their presence indicates excellent water quality.

Identified on: 4/22/2026