Tor was introduced for stocking purpose in Naukuchiatal and Sattal during:

Correct option is A

Correct Answer: (a) 1858
Explanation:
→ Historical records indicate Tor (mahseer) introductions for stocking in Kumaon lakes like Naukuchiatal and Sattal around 1858 to enhance sport and subsistence fisheries.
→ Early colonial fish introductions aimed to establish game fish in hill lakes.
Information Booster:
→ Mahseer introductions affected native fish communities and are part of early fisheries management history in India.
Additional Information (Other Options):
(b),(c),(d): Other dates not matching documented introductions.