This thesis investigated and compared inputs and outputs, economic factors and current
feed use in small-scale farming systems producing striped catfish (Pangasianodon
hypophthalmus) in the Mekong Delta. The nutrient content of locally available natural
feed resources for striped catfish was determined and growth performance, feed
utilisation and body indices were analysed in pond-cultured striped catfish fed diets
where fish meal protein was replaced with protein from local feed resources.
A survey showed that around 15 feed ingredients are used in striped catfish pond
culture in the region. The combination of feed ingredients used in farm-made feeds
varied among fish farms. The cost of producing 1 kg of fish using farm-made feeds was
usually 8˗10% lower than that of using commercial feeds. Digestibility trials on
selected potential feedstuffs showed that the apparent digestibility (AD) of DM, CP,
OM and energy was highest in soybean meal, groundnut cake, broken rice, shrimp head
meal, golden apple snail and catfish by-product meal and earthworm meal, whilst the
digestibility was in lower cassava leaf meal and sweet potato leaf meal. The average
digestibility of most essential amino acids (EAA) in selected feed ingredients was high
(range 70˗92%), indicating high protein quality of these feedstuffs. In general, the AD
of individual EAA was high for all diets except those with cassava leaf meal, rice bran
and earthworm meal, where the AD of EAA was reduced. Two different growth
experiments with the same diet (20˗100% replacement of fish meal) were performed in
an indoor and an outdoor culture system. A significant finding was that daily weight
gain (DWG) was much higher (3.2˗ to 6˗fold) in outdoor culture conditions compared
This thesis investigated and compared inputs and outputs, economic factors and currentfeed use in small-scale farming systems producing striped catfish (Pangasianodonhypophthalmus) in the Mekong Delta. The nutrient content of locally available naturalfeed resources for striped catfish was determined and growth performance, feedutilisation and body indices were analysed in pond-cultured striped catfish fed dietswhere fish meal protein was replaced with protein from local feed resources.A survey showed that around 15 feed ingredients are used in striped catfish pondculture in the region. The combination of feed ingredients used in farm-made feedsvaried among fish farms. The cost of producing 1 kg of fish using farm-made feeds wasusually 8˗10% lower than that of using commercial feeds. Digestibility trials onselected potential feedstuffs showed that the apparent digestibility (AD) of DM, CP,OM and energy was highest in soybean meal, groundnut cake, broken rice, shrimp headmeal, golden apple snail and catfish by-product meal and earthworm meal, whilst thedigestibility was in lower cassava leaf meal and sweet potato leaf meal. The averagedigestibility of most essential amino acids (EAA) in selected feed ingredients was high(range 70˗92%), indicating high protein quality of these feedstuffs. In general, the ADof individual EAA was high for all diets except those with cassava leaf meal, rice branand earthworm meal, where the AD of EAA was reduced. Two different growthexperiments with the same diet (20˗100% replacement of fish meal) were performed inan indoor and an outdoor culture system. A significant finding was that daily weightgain (DWG) was much higher (3.2˗ to 6˗fold) in outdoor culture conditions compared
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