Heat oil in a large (6-quart) Dutch oven or large (4-quart) saucepan over medium-high heat. Add onion, celery, and chorizo and sauté for 3 minutes. Stir in garlic and cook for 1 minute more.
Stir in tomatoes with liquid, chickpeas with liquid, clam juice, water, oregano, salt, and black pepper, reduce heat to medium-low, and simmer for 5 minutes.
Meanwhile, pat catfish fillets dry with a paper towel and cut into 1-inch pieces. Place in a bowl and season with 1 teaspoon of Sazon Goya until well coated. Stir catfish into stew and cook for 3 minutes. Remove Dutch oven from heat, give the stew another good stir, and let sit for 3 minutes more before tasting. Season with more salt and pepper if so desired.