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Some caddis fly species are tolerant of slight pollution.
We particularly needed to gather together this group of experts to be sure than any adult caddis found were indeed Land Caddis.
The size, the material used and how its case has been constructed can identify each sub species of cased caddis.
The Caddis larvae normally live on river-beds, and make cocoons for themselves from bark, gravel and other river detritus.
In recent years there has been quite a craze for the Polish or Check heavily weighted nymphs that imitate free-swimming caddis larvae.