In a medium bowl add the cod and shrimp, sprinkle with salt. Squeeze the juice from both limes on the fish, allow to sit at room temperature while you prepare the rest of the meal.
Heat the oil in a large pot or Dutch oven over medium high heat. Add the peppers and onions, cooking until softened.
Stir in the garlic, red peppers, pepper and cumin, then pour in the beer and broth, then the coconut milk and tomatoes. Simmer until tomatoes have broken down, about 15 minutes.
Raise the heat to a low boil, stir in the fish and shrimp, cooking until the cod has broken up and the shrimp has cooked, remove from heat. Add additional salt and pepper to taste.
Serve warm with rice and cilantro.