The
Watershed Game
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Earth
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Water for Life 2003-2004
Alberta
Environmental Education
Focus on Series
City
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US Environmental Protection Agency
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River
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Caddis flies
Caddis flies are a large common group of aquatic insects found in
the Bow River and its tributaries. Caddis fly larvae build shelters
around themselves to protect their delicate gills on their abdomen.
Using a "glue" that they secrete from their mouth, the
larvae can glue bits of bark, sand, plants or shells together to
make a protective shelter.
This Caddis fly has used bits of bark to build a home.
Mayflies
Mayflies are found in cool, clear well-oxygenated water and are
good indicators of healthy aquatic environments. You can identify
a mayfly by its 3 tails and the small hair-like gills along its
abdomen. The mayfly is has adapted to a clinging, crawling lifestyle
in fast water with its squat body, powerful legs and hooklike claws.
The gills of the mayfly are protected with plates.
Stoneflies
Stoneflies are another large and important group of aquatic insects.
When you find stoneflies you know you have a healthy aquatic environment.
Stoneflies are an important source of food for fish and birds, like
ducks and geese. All stoneflies have 2 tails and their gills are
located on their thorax (underneath on their stomachs). Some stoneflies
may have gills on their legs or the tip of their abdomen. If a stonefly
lives in fast moving water it may breathe directly through its skin!
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