An abnormal common torpedo Torpedo torpedo (Linnaeus, 1758) was caught in the Lagoon of Bizerte, brackish water area located in Northern Tunisia. The specimen was an adult male, 260 mm in total length and 129 g in mass. It presented a lack of the fifth gill-slit on the left side and weighed considerably less than normal males of the same size class, reflecting the role of this abnormality in the life of the specimen, probably in homeostasis. A review of all cases of abnormalities in torpedinids shows the scarcity of records for these species.