Some deformities noticed in the indian mackerel,udRastrelliger kanagurta (Cuvier)

摘要

Eight spscimens of abnormal mackerel caught at Cochin are described. Three ofudthem had deformed tails. One was hunchbacked. Two had unusually long mandibles,udwhile another one had a short mandible and a freak maxilla. The last specimen had anudanomalous anal fin. The occurrence of abnormality was one in eight hundred. Irregularityudin the caudal region was the most common abnormality.