External

1.The nostril or nasal aperture 2.The eye 3.The gill cover 4.The lateral line 5.The small spine 6.The dorsal fin 7.The adipose fin 8.The tail or caudal fin 9.The mouth  10.The ventral keel 11.The pectoral fin 12.The pelvic fin 13.The anal pore 14.The anal fin 15.The caudal peduncle
 
 

Internal

1.Olfactory bulb 2.Skull 3.Brain 4.Spinal cord 5.Spinal (vertebral) column 6.Kidney 7.Swim bladder 8.Muscle section 9.Heart 10.Gills 11.Liver 12.Stomach 13.Sex organ 14.Intestine 15.Anal pore