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[BOOK] Pocketguide to Western Hatches

D Hughes - 2011 - books.google.com
... The food might be an aquatic insect such as a mayfly in its nymph, emerger, dun, or spinner stage,
or a caddisfly in its larva, pupa, adult, or egg-laying stage. ... Some of these are true hatches, in which
insects emerge from their nymph or pupal stage. Some are not. ...

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