Abnormalities in Bagarius bagarius (Ham.) collected from the Biratnagar fish market was studied with the help of x-ray photographs, morphological and anatomical examinations. Vertebral column behind pelvic fin region has three serpentine shaped curvatures. Tubercles irregularly arranged along the lateral lines of both sides. In the deformed vertebrae inter-vertebral space is comparatively wide. Developmental error was found responsible for deformities in the present fish specimen.
