In mountain and hilly regions rainbow trout is the main fish species cultivated whereas carps, tilapia and pangasius are cultivated in the inner terai and terai region. Around 12,000 tonnes of pellet feed is used in aquaculture, of which about one third is imported from India. Around 60% of carps are fed with pellets or homemade feed. Around 40% of carp farmers, mainly small-scale, do not use any types of artificial feed but rely upon natural productivity of ponds.