Sea trout on the Rio Grande behave very much like our sea trout at home, there just tends to be more of them and they’re bigger. Their habits, however, are pretty much the same and when darkness begins to fall the sea trout become more active, often emerging from underneath banks and slipping out of deep pockets and pools. You would never dream of heading into the gloaming without a leech pattern of some description. Unless the water was very high or carrying a lot of colour, then this would be my go-to pattern. I would then venture to the ‘Gato Negro’ for the last few casts when something a lot bigger will often be the ticket to success.