1. Aquatic Biotechnology Department, Biotechnology Animal Division; CIGB; Habana Cuba
2. Centro de Productos Naturales; Calle 198 entre 19 y 21, Atabey, Playa, Habana Cuba
3. Department of Morpho-Physiology; University of Camagüey Ignacio Agramonte Loynaz; Km 5½, Camagüey 74650 Cuba