i have completed my masters in biotechnology . am really confused regarding what to pursue next as in mba or phd 

and if you suggest mba then in which stream whixh has more job oppurtunity

If I were you I would go for Ph.D. because I am hungry for knowledge. You have spent a good amount of time in Biotech, try to make something out of it. But if you really like management, it is your choice. You need to ask yourself what you want. Everything has the opportunity but for those who have zeal.