Whole Roasted Arctic Char with Fennel and Pistou

Name: Whole Roasted Arctic Char with Fennel and Pistou
Ingredients: 1 (2 to 3 pound) whole arctic char, gutted and scaled, gills and fins removed, head and tail intact; Sea salt and freshly ground black pepper; 4 handfuls mixed fresh herbs (basil, thyme, tarragon); 1 small bulb fennel, sliced, fronds reserved; 4 bay leaves; 1 lemon, cut into 4 slices; Extra-virgin olive oil, as needed; 1 recipe Pistou, recipe follows; 2 anchovy fillets; 2 garlic cloves; 1 cup packed fresh basil leaves; 1/2 cup extra-virgin olive oil; 1/2 lemon, juiced; 1 vine-ripe tomato, seeded, and chopped