River Clun
... that in 2000, an ammonia discharge into a tributary of the River Clun in Wales killed its entire population of European bullheads?
... that in 2000, an <a href="./Ammonia" id="mwDZw" rel="mw:WikiLink" title="Ammonia">ammonia</a> discharge into a <a href="./Tributary" id="mwDZ0" rel="mw:WikiLink" title="Tributary">tributary</a> of the <b id="mwDZ4"><a class="mw-redirect" href="./River_Clun,_South_Wales" id="mwDZ8" rel="mw:WikiLink" title="River Clun, South Wales">River Clun</a></b> <i id="mwDaA">(pictured)</i> in <a href="./Wales" id="mwDaE" rel="mw:WikiLink" title="Wales">Wales</a> killed its entire population of <a href="./European_bullhead" id="mwDaI" rel="mw:WikiLink" title="European bullhead">European bullheads</a>?