Thaw fish heads and tails, if frozen; rinse. Place in a 4-quart Dutch oven with vegetables, parsley, bay leaf, peppers, and 3/4 teaspoon salt. Add water, wine, and lemon juice.
Bring to boiling. Reduce heat simmer, covered for 45 minutes. Strain through cheesecloth. Use as directed in recipe. Store unused stock in the refrigerator for three days or in the freezer for up to 6 months. Makes 7 cups.
Nutriton facts are provided per cup of fish stock.