why do you think fisheries is a major occupation in india?

The answer to your question is already covered in our study material. Follow the given link and scroll down to the topic 'Importance of fisheries' to view the same.

https://www.meritnation.com/cbse/class11-commerce/studymaterial/economics/indian-economic-development/unit-iiirural-development/442_2488_6392#slide1_Agricultural Diversification– Animal Husbandry, Fisheries, Horticulture