Catfish and Okra Gumbo

Name: Catfish and Okra Gumbo
Ingredients: 4 ounces canola oil; 3⁄4 cup all-purpose flour; 1 cup celery, chopped; 1 cup bell pepper, chopped; 1 cup okra, cut in thick pieces (stems and tips removed); 1 large shallot, diced; 1 large tomatoes, seeded and diced; 2 large garlic cloves, diced; 1 serrano pepper, diced; 2 ears corn; 1 lb catfish; 1 lb andouille sausage; 32 ounces seafood stock; 1⁄2 teaspoon Old Bay Seasoning; 1 tablespoon hot sauce; 1 teaspoon thyme; 1 teaspoon oregano; 1 tablespoon kosher salt; 1 teaspoon pepper, freshly ground; 2 bay leaves; 1 cup water