1 pound jumbo shrimp, peeled and deveined, shells reserved
8 cups seafood stock
2 tablespoons extra-virgin olive oil
1 small white onion, diced
1 carrot, cut into 1/4-inch-thick rounds
2 stalks celery, diced
1 green bell pepper, diced
1 tomato, seeded and diced
4 dried chiles de arbol, roughly chopped
2 tablespoons tomato paste
1 tablespoon Mexican dried shrimp powder (optional)
Lime wedges, for serving (optional)