<< I imagine the fishes are the last to suffer from most water quality
problems. Fortunately state and federal EPAs use invertebrate populations.
Certain mayflies, dobsonflies, etc are indicators of water quality. Also, a
wide diversity of species and genera, as opposed to dominance by a few,
indicate system health.
--
Jay DeLong >>
I was aware that certain insect larva were environmentally sensitive however
I would have thought that fish, being more complex organisms, would be
affected first.
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