Step 1: Understanding the Question:
The question identifies the commercially significant catfish species found in the Pong Reservoir, a large man-made wetland located in the Kangra district of Himachal Pradesh, India.
Detailed Explanation:
• Pong Reservoir Ecology: Also known as Maharana Pratap Sagar, it is a Ramsar site and a major destination for migratory birds. It supports a flourishing fishery consisting of both indigenous and exotic species.
• Dominant Species: The reservoir is famous for its "Singhara" (Sperata seenghala) and "Malli" (Wallago attu). These two are the apex predators and the most valued catfish in the local market.
• Sperata seenghala: Known for its high growth rate and fleshy texture with fewer bones, it constitutes a significant percentage of the catfish catch in the reservoir.
• Wallago attu: Often called the "freshwater shark" due to its predatory nature, it is a large catfish that thrives in the deep waters of the reservoir.
• Other Species: While the reservoir also produces Mahseer (Tor putitora) and carps (Labeo rohita, Cyprinus carpio), the catfish fishery is primarily driven by the Sperata-Wallago complex. Species like Clarias magur are typically found in swamps and wetlands rather than large, deep reservoirs like Pong.
Step 2: Final Answer:
The most important catfish species of Pong reservoir are Sperata seenghala and Wallago attu.