The two Tropheus illustrated here, T. sp. &quot;Kiriza&quot; and T. moorii &quot;Kachese&quot;, were considered to be &quot;of the same taxonomic species&quot; not too long ago. In this case, it's plainly obvious these are not the same fish whatsoever. If we used &quot;taxonomic rank&quot; as our &quot;guideline&quot; for selecting which fishes are &quot;permissible&quot; to be bred together in a program which at minimum considers the conservation merits of breeding, &quot;taxonomic rank&quot; would have condoned the free interbreeding of these forms to devastating future consequences for both species in captivity. Image by Thomas Ernst | &lt;a href=&quot;http://commons.wikimedia.org/wiki/File:Tropheus.jpg&quot; target=&quot;_blank&quot;&gt;Public Domain&lt;/a&gt;