Etheostoma variatum
... that when Etheostoma variatum are seen, rivers are probably clean?
... that when <i id="mwBac"><b id="mwBag"><a href="./Etheostoma_variatum" id="mwBak" rel="mw:WikiLink" title="Etheostoma variatum">Etheostoma variatum</a></b></i> are seen, rivers are probably clean?