Optimal protein replacement of fish meal by mackerel condensate in diet for giant freshwater prawn (Macrobrachium rosenbergii) |
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| Authors: | Wattana Wattanakul Uraiwan Wattanakul Karun Thongprajukaew Chutchawan Muenpo |
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| Affiliation: | 1. Department of Fisheries Technology, Faculty of Sciences and Fisheries Technology, Rajamangala University of Technology Srivijaya, Trang, Thailand;2. Department of Food Industry and Fisheries Products, Faculty of Sciences and Fisheries Technology, Rajamangala University of Technology Srivijaya, Trang, Thailand;3. Department of Applied Science, Faculty of Science, Prince of Songkla University, Songkhla, Thailand;4. Biochemical Research Unit for Feed Utilization Assessment, Faculty of Science, Kasetsart University, Bangkok, Thailand;5. Department of Biology, Faculty of Science, Prince of Songkla University, Songkhla, Thailand |
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| Abstract: | The optimal protein replacement of fish meal (FM) by mackerel condensate (MC) was investigated in giant freshwater prawn, Macrobrachium rosenbergii (0.90 ± 0.01 g initial weight) over a 12‐week trial. The experimental diets replaced the FM partially in a baseline FM‐based diet (0MC), by substituting MC for 10% (10MC), 20% (20MC), 30% (30MC), 40% (40MC), 50% (50MC) and 60% (60MC) of the FM, and a commercial diet (CD) was included for comparison. The prawn fed with 40MC had superior growth performance and feed utilization. Significant increases in amylase and cellulase‐specific activities indicated improved carbohydrate utilization in this dietary group (P < 0.05). The proteolytic activity was maintained through the key gastrointestinal enzymes (pepsin, trypsin and chymotrypsin). A slight improvement in carcass compositions was also observed in the prawns fed 40MC, and the total haemocyte count was significantly increased by this diet, without negative effects on the hepatopancreatic histology. These findings indicate that a 40% protein replacement of FM by MC is optimal for giant freshwater prawn, and similar use of it in the aquafeed of other species appears worth further studies. |
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| Keywords: | by‐product carcass composition digestive enzyme feed utilization haemocyte |
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