Apart from MSc you can go for MCA and MBA program. 

You can also go for the courses like civil services. This exam is conducted by Union Public Services Exam (UPSC) once in a year. Through this exam you can make your career as a IAS, IPS officer. You can also choose your career as a research scientist in agriculture and fisheries. There is huge demand of zoologist in Fish farms, leisure centres etc.

All the Best!!