I suspect this is possibly one of the few catch report from Argentina! (From memory I've posted just two others previously from the tip of South America where our members were targeting the large sea-run Brown Trout, fish to over 20lbs in weight.)
Anyway one of our members, Marc Towers, is currently fishing rivers within the massive River Plate catchment; a sub tropical region (I understand it is the 6th largest system in the World.) Firstly fishing the Rio Parana he caught a range of exotic species - mainly Catfish and Piranha - but additionally what is a very rare Catfish species, the Manguruju. Marc's primary challenge though was a similarly rare Short Tailed River Ray and he larded two, one smallish and the other, a 260 pounder - 120 kilos. The BIG fish was taken in just two metres of water!
He then moved on, where he currently is, to fish to fish the fabled La Zona on the Rio Urugay targeting Golden Dorado. And he's already had a few, but no monsters ..... yet.