==New Zealand longfin eels== 
 I don't know if you still monitor this page, but in case you do... the TeAra article on New Zealand eels asserts that longfin eels "are probably the world’s biggest eels". The maximum published weight of these eels is 25 kilograms, and there have been "rare" historical reports of them reaching 50 kilograms. The maximum published weight of the European conger is 110 kilograms. Regards