Key Concept: Growth speed is a major factor in choosing species for intensive freshwater aquaculture.
Why it's correct: Pangasius hypophthalmus reaches marketable size within just 6–8 months, the fastest among common cultured freshwater species in India.
Why others fail: Catla and Rohu (Indian major carps) grow at a moderate rate, and Clarias batrachus, though hardy, grows slower and is less commonly farmed today.