Step 1: Understanding the Concept:
Historical records of fish introduction and stocking help map how sport and food fisheries developed in high-altitude Indian lakes.
Step 2: Detailed Explanation:
In 1858, Sir Henry Ramsay (the Commissioner of Kumaon) took the first initiative to introduce the Golden Mahseer (Tor putitora) into the high-altitude lakes of Kumaon (specifically Bhimtal, Naukuchiatal, and Sattal) from the nearby Gaula River.
This introduction succeeded in establishing a highly popular sport fishery in the region.
Step 3: Final Answer:
The fish first stocked by Sir H Ramsay in Kumaon lakes was Mahseer, which is option (D).