Lake Erie watersnake
... that following the introduction of the round goby to Lake Erie, the Lake Erie watersnake's population recovered enough to be removed from the U.S. threatened species list?
... that following the introduction of the <a href="./Round_goby" id="mwAYY" rel="mw:WikiLink" title="Round goby">round goby</a> to Lake Erie, the <b id="mwAYc"><a href="./Lake_Erie_watersnake" id="mwAYg" rel="mw:WikiLink" title="Lake Erie watersnake">Lake Erie watersnake</a></b><span about="#mwt46" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"`s","href":"./Template:`s"},"params":{},"i":0}}]}' id="mwAYk" typeof="mw:Transclusion"><span typeof="mw:Entity">'</span>s</span> population recovered enough to be removed from the U.S. <a href="./Threatened_species" id="mwAYo" rel="mw:WikiLink" title="Threatened species">threatened species</a> list?