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Heat the oil in a large saucepan with a tight-fitting lid, then add the fennel, garlic and chilli. Fry until softened, then add the squid, basil stalks, tomatoes and wine. Simmer over a low heat for 35 mins until the squid is tender and the sauce has thickened slightly, then season.
Scatter the mussels and prawns over the sauce, lay the sea bass fillets on top, cover, turn up the heat and cook hard for 5 mins. Serve scattered with the basil leaves and fennel fronds, with crusty bread.