- To make stock, bring shrimp shells to a boil in water (can also add carrot skins, celery leaves, fennel greens, and onion skins). Simmer for 2 hours. Drain and reserve liquid. 
- In large stockpot, add all vegetables, including garlic, and sweat until onions are translucent. 
- Add tomato puree, bay leaf, thyme, shrimp stock, chipotle pepper, and oregano. Simmer for 2 hours. 
- Add salmon and white fish. Simmer for 1 hour more, breaking fish with back of spoon. Add shrimp and clams. Cook 1 minute. When ready to serve, add black peppercorns and cilantro. Remove chipotle.