Little Yellow Salleys

Order: Plecoptera

Family: Perlodidae

Genus: Isoperta

Life Cycle: incomplete

Three Life Stages: egg, nymph and adult

Emergence: July-September

Nymph

Body Description

Antennae: 2 long

Eyes: 2 black beady

Tails: 2

Legs: 6

Abdomen: 10 segments

Mobility: active predators that crawl among the rocks looking for insects

Body Color: transparent golden yellow to dark brown with ribbing

Size: 3/8”-5/8”, 7-16 mm

Hook Size: 8-14, 2X long

Stonefly nymphs are best found in cold water streams with the biggest population living in fast flowing streams in the mountains.

Adult

Body Description

Antennae: 2 long

Eyes: 2 black beady

Tails: 2

Legs: 6

Abdomen: 10 segments

Mobility: very active, often seen flying out over the water and around the foliage

Body Color: pale to a bright yellow translucent color

Size: ½”-3/4”, 7-16 mm

Hook Size: 10-16

Females glide, fly or drop over riffles and runs to deposit their eggs. This may take several times before all the eggs are deposited. Many females end up on the water.