Zebra fish ( Danio rerio ) has been emerged as one of the latest “models” for vertebrate embryological development studies. It offers advantages over traditional mammalian models as it has transparent body which is helpful in tracking down of drugs and can easily be monitored under foldscope. Heartbeat of the normal Zebra fish embryo (a week old) was recorded under foldscope. Auricles and Ventricles of  the  heart and Yolk sac is clearly seen.