Pangasius (Striped Catfish) Farming: A Production Guide
How pangasius (Pangasianodon hypophthalmus) is farmed: air-breathing biology, intensive Mekong Delta pond culture, induced spawning, fast growth and FCR, fillet export, and main diseases.
Overview
Pangasius, or striped catfish (Pangasianodon hypophthalmus), is a freshwater catfish of the family Pangasiidae native to the Mekong and Chao Phraya river basins of Southeast Asia. It is one of the world's largest freshwater aquaculture industries and a major export commodity, centred on the Mekong Delta of Vietnam, where annual production reaches well over a million tonnes; Vietnamese output has been reported around 1.5 to 1.7 million tonnes in recent years. The fish is sold internationally as frozen fillets under names such as basa, tra and swai.
Biology and tolerance
A defining feature of pangasius is an accessory air-breathing organ derived from the swim bladder, which lets the fish take oxygen from the air. This tolerance of low dissolved oxygen allows extremely high stocking densities that would suffocate most other fish. Pangasius is omnivorous, grows quickly, and requires a lower share of animal protein than strictly carnivorous species, which helps keep feed costs down.
Culture systems
Most pangasius is grown in intensive earthen ponds along the Mekong, and also in river cages and pens. Because of the air-breathing habit, ponds are stocked very densely and yield large harvests per unit volume: research on cage systems reports stocking on the order of around 19 to 25 fish per cubic metre giving yields of roughly 12 to 15 kg per cubic metre. Such intensity makes water-quality and effluent management a central concern.
Seed supply and reproduction
Commercial seed comes from hatcheries that use induced spawning (hormone injection) of domesticated broodstock, since the fish does not spawn spontaneously in ponds. Eggs are incubated and the fry are nursed to fingerling size before stocking into grow-out ponds. Reliable hatchery seed supply was a key step in the industry's rapid expansion.
Feeding, growth and harvest
Pangasius is fed formulated pellet diets in intensive culture and converts feed efficiently, with reported feed conversion ratios on the order of about 1.4 to 1.7. It grows fast, typically reaching a market size of around 1 kg or more within several months to about a year. Fish are harvested from ponds and processed into skinless, boneless fillets for the frozen export trade.
Diseases and certification
The most important disease is bacillary necrosis of pangasius (BNP), caused by the bacterium Edwardsiella ictaluri, and motile aeromonad infections (Aeromonas) also cause losses, both favoured by the crowding and water-quality stress of intensive ponds. To access international markets, many farms are certified under standards such as the Aquaculture Stewardship Council (ASC) or Best Aquaculture Practices (BAP), which set requirements for environmental and food-safety performance.