I have difficulty reading about fish when the chat is about its genus, and its fins are caudal,dorsal or downright blobblob, and i come away not knowing what on earth was being said. So instead of describing 'genus' i will try and write about 'groups with similar characteristics'= a genus, !!! and everyone will know what i am talking about. similarly, lets call tails, tails and not just caudal fins, pectoral fins (add in side fins), dorsal=back, anal and pelvic at least are fairly self explanatory except for those of us who talk out of the anal end......