If there is one fly that all Argentinean guides on the Rio Grande insist that you carry it is the Black Leech. When fishing for Sea Trout in Argentina during the last hour of fishing at dusk, the ‘magic hour’ the Black Leech is the No.1 choice. Keep a good supply, (a dozen would be a sensible bet over a week) as if you are going to loose flies during your trip it is as the visibility declines.
