Infectious disease in ornamental fish, how to prevent it through immunity, biosecurity and quarantine, the seven common diseases and their causes, and the environmental effects of the trade.
Deshapriya Senevirathne. B.Sc. (Hons) Biology Special, University of Peradeniya — graduated with a class pass. All the content and lessons in A/L Biology on Paadama are reviewed by Deshapriya Senevirathne, and the lessons are taught by him.