Lobster Bisque without peppercorns butter

4 cups fish stock 1 raw carrot , sliced thinly 1 stalk celery & leaves , sliced thinly 1 leek white , sliced thinly 2 lobster tails , halved lengthwise 2[...]

3 quarts water 4 (1 1/2 lb) live lobsters , split lengthwise 1/4 cup pure olive oil 1 lb fennel bulb (halved, cored and coarsely chopped) 3 celery ribs ,[...]