author(s)
Sangram Ketan Sahoo, Shajahan Ferosekhan, Shiba Shankar Giri, Manoranjan Paramanik and Kalidoss Radhakrishnan

abstract
The incidence of deformation in the larvae is considered as a problem as well as possesses economic challenges in the aquaculture industry. The frequency of its incidence ranges from 4-5% during normal larval production in the hatchery. In this study, we tried to segregate and classify the yellow catfish, Horabagrus brachysoma deformities. The different type of abnormalities appeared in the larvae were categorised as, teratoma: undifferentiated embryonic mass without any body parts; acephala: larvae possessing undifferentiated head; tunicate: looks like a pigmy, shorter in length compared to normal larvae; humpback: curvature on the notochord at the trunk region; axial deformity: bend in trunk or tail region; compound tetras: larvae possessing multiple curvatures in both trunk and tail. It also observed that these deformed larvae were died within 5-6 days of rearing.