Heat oil in a large saucepot over medium heat. Add fennel and leeks, cover and cook over low heat for 10 minutes, stirring occasionally. Remove cover, pour in white wine and cook for 1-2 minutes. Add stock, tomatoes, California Ripe Olives, thyme, salt, black pepper, bay leaf, orange peel and saffron. Turn heat to high and bring to a boil. Then cover, turn heat down to low and simmer for 10 minutes. Remove cover, stir in fish and cook for 2-3 minutes over medium heat, until fish is opaque. Remove from heat and stir in lemon juice.