Trubachyov, Oleg, editor (1983), “*<span class="searchmatch">klenь</span>”, in Этимологический словарь славянских языков [Etymological dictionary of <span class="searchmatch">Slavic</span> languages] (in Russian), numbers...
fish, perhaps *<span class="searchmatch">klenь</span>, *<span class="searchmatch">klěnь</span>, but this looks like the same word. *uklěja f bleak (a leuciscine fish) * -asъ is the expected Balto-<span class="searchmatch">Slavic</span> form but is found...