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Asian river catfish (Pangasius bocourti Sauvage, 1880) were cultured at five different stocking densities in cages (submerged volume 1 m 3 ) suspended in a dugout pond from August to November 2009. Pangasius bocourti fingerlings (mean weight 27.09 ± 0.54 g) were stocked at densities of 12, 25, 50, 100, and 200 fish m -3 . At the end of 3 months, the harvest weights (gross yields) were, respectively, 2.05 ± 0.30, 5.20 ± 0.31, 10.60 ± 0.42, 19.98 ± 0.78, and 42.37 ± 0.41 kg m -3 . The mean fish weights among the stocking densities of 25, 50, 100, and 200 fish m -3 were not significantly different, but were significantly higher than that of the 12 fish m -3 density. The specific growth rates among high stocking densities of 50, 100, and 200 fish m -3 were not significantly different; however, they were significantly higher than those of the low stocking densities of 12 and 25 fish m -3 . Asian river catfish performed poorly at the lowest density. The results indicate an initial lower stocking threshold for Asian river catfish of above 5.20 kg m -3 . The Asian river catfish cultured in small cages placed in a pond reached the desirable market size ([200 g) within a 90-day grow-out period. The results show that the maximum yield for Asian river catfish during a 3-month production cycle was not reached.

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Asian red-tailed catfish (Hemibagrus wyckioides) were raised at five different stocking densities in cages (submerged and with a volume of 1 m 3 ) suspended in a fish pond from July to August 2012. H. wyckioides fries (mean weight 0.8 ± 0.1 g) were stocked at densities of 25, 50, 100, 200, and 400 fish/m 3 . At the end of 56 days, the mean fish weights among the stocking densities of 25 and 50 fish/m 3 were significantly lower than those of the 100, 200, and 400 fish/m 3 density. The specific growth rates and final mean weights amongst fish reared in higher stocking densities of 100, 200, and 200 fish/m 3 were higher than those of the low stocking densities of 25 and 50 fish/m 3 . Asian river catfish performed poorly at the lowest density. The results indicate an initial lower stocking threshold for Asian red-tailed catfish fries of above 100 fish/m 3 . The Asian red-tailed catfish fries reared in small cages placed in a pond reached the size 5-6.6 g within a 56-day nursing period.