Bouillabaisse originates from Marseille. An authentic Marseille bouillabaisse must include rascasse (a bony rockfish).
Julia Child, who lived in Marseille for a year, was a bit more liberal and wrote; "To me the telling flavour of bouillabaisse comes from two things: the Provençal soup base - garlic, onions, tomatoes, olive oil, fennel, saffron, thyme, bay, and usually a bit of dried orange peel - and, of course, the fish - lean (non-oily), firm-fleshed, soft-fleshed, gelatinous, and shellfish."
So where does that leave us? In broad terms a bouillabaisse will feature a variety of fish of different textures, shellfish, bread slices to place in the bottom of the soup bowl and a rouille (sauce) to dollop into the soup. It's a main course and should be eaten with gusto.
Francois also had a bowl of grated cheese on the table and this would cause consternation to many a Frenchman. Serve it on the table in a large bowl as he did (or the pot that you made it in), let your guests add bread to their soup bowl, some grated cheese, the soup and the rouille.
Serves 8