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Montana Field Guide

Montana Field Guides

American Springfly - Skwala americana


Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:


 

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General Description
The Skwala is a colorful stonefly nymph that hatches in early spring when not many other insects are hatching, making it the first large, post-winter meal for trout, and good fishing for fisherman. The Skwala hatch begins as river waters begin to warm, usually the end of February, which provides a pre-runoff fishing opportunity. The Bitterroot River has become a favorite river for the skwala hatch, but many other large Montana rivers such as the Clark Fork River, Blackfoot, Smith, Yellowstone and Madison Rivers contains these insects in large enough numbers to make fishing the hatch worthwhile.

Phenology
The Skwala hatch begins as river waters begin to warm, usually the end of February and continues through April in dark canyon reaches that remain colder.

Summary of Observations Submitted for Montana
Number of Observations: 15

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Food Habits
Merritt and Cummins (1996) report that members of the families, Perlidae and Perlodidae, are largely predators eating other aquatic invertrebrates, especially Diptera (Chironomidae and Simuliidae, midges and blackflies) and Mayflies.

Ecology
The Skwala hatch begins as river waters begin to warm, usually the end of February,

References
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Citation for data on this website:
American Springfly — Skwala americana.  Montana Field Guide.  .  Retrieved on , from