Summarize this article:

Place 6 catfish filets (6-8 oz.) of fish in the basket. Combine 1/3 cup of lemon juice, 3 tbsp. of melted butter, and 1 tbsp. of lemon pepper seasoning together in a small bowl. Use a brush to cover the fillets with the mixture. Close the cover. The fish should flake on each side if you touch it with a fork. Continue to baste the fish while it's cooking. Serve this grilled catfish with mashed potatoes or grilled vegetables.

Summary:
Coat a basket with cooking spray. Place the fish in the coated grilling basket. Combine the lemon juice, butter, and lemon pepper seasoning together. Brush the fillets with the butter mixture. Place the basket on your grill. Grill the fish over medium coals over 300-400F (148-204C) heat for about 6-8 minutes on each side. Serve.