Wildlife Survey & Photo Service
Hydropsyche, also called the "Spotted Sedge," are a major source of food for trout and other fish. They are extremely common in tail-water fisheries. The specimens show at the left were collected in the same sample which shows that variety of sizes in the creek at the same time. They were collected in Putah Creek. Note the scale as the larger specimen is about one inch in length.
There are many other species that resemble Hydropsyche. They are commonly confused them with Rhyacophila "Green Rock Worms" which do not have the large number of gills found on Hydropysche.
Hydropsyche larvae are real meaty - a great meal for trout. They do not build cases until they are ready to pupate. Trout can easily dislodge the larvae by rooting between rocks where Hydropsyche build their nets. See the nets a the next tab.
Adult "Spotted Sedge" are large bugs. We have caught adult females in Putah Creek when they dive back into the water to lay eggs. In my experience they go back in the water at dusk or even as late as Midnight. We have captured many adults - in the water - during the 10:00 PM to 11:00PM sample time.
Please return for a suggested Hydropsyche pattern.
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