Catfish is named for its whisker-like feelers. It is a firm and mild-tasting fresh-water fish. Some people feel wild catfish has a muddy flavor, perhaps because they know catfish are bottom-feeders. Nowadays, however, catfish is farm-raised or grains, and its flavor is clean and fresh.
Fillets often have one end that is thicker than the other. To evenly cook fillets, simply arrange fillets so the thin ends are at the outside of the grill where the heat is less intense.
Prepare the pecan mixture up to four hours in advance, cover and refrigerate it until you are ready to grill. Press the pecan mixture onto the fish up to 30 minutes before grilling.