The Application of Fishmeal Processing Wastes for Reducing Feed Cost of Butter Catfish (Ompok bimaculatus) Culture
Keywords:
fish condensate, fish oil, Ompok bimaculatus, growth, feed costAbstract
The objective of this study was to assess the effects of additional fishmeal processing wastes to commercial feed on the growth and feed cost in butter catfish (Ompok bimaculatus) aquaculture. Fish with initial weight of 8.05±0.5 - 9.17±1.24 g were raised in nine 2 × 2 × 1 m3 cages at a density of 50 per cage. These cages were suspended in three 8 × 8 × 1.2 m3 ponds (three cages in each pond.). Three feed recipes applied were: 1) purely commercial feed (T1); 2) commercial feed supplemented with fish condensate (T2); and 3) commercial feed supplemented with fish oil (T3), both at 10 ml per kg of commercial feed. The experiment was conducted over three months. Results show that growth performances, in terms of mean final body weight and final body length, did not differ significantly (p>0.05) with mean final body weight between 26.61±3.17 and 30.55±7.04 g, and final body length between 15.32±1.05 and 15.66±1.45 cm. However, fish condensate and fish oil supplemented to commercial feed did significantly affect the survival rate, the feed conversion ratio, and the feed cost. Fish thriving on T2 and T3 diets exhibited higher survival rates (97.33±1.15 and 99.33±1.15%, respectively), low feed conversion ratios (2.03±0.69 and 1.93±0.38), and low feed cost (59.9±20.3 and 58.9±11.7 baht per kg) while fish fed T1 had a survival rate of 89.33±3.06%, a feed conversion ratio of 2.93±0.70, and a feed cost of 83.5±20.0 baht per kg. The study reveals that fish condensate and oil supplements, at the above-mentioned amounts, could reduce fish feed costs by 23.6-24.6 baht per kg of O. bimaculatus production. These results can be used as a guideline to investigate other feed formulae for reducing feed costs in aquaculture.
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