Biotransformation of tuna waste by co-fermentation into an aquafeed ingredient |
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| Authors: | Hena Vijayan Imelda Joseph & Rajaian Paul Raj |
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| Institution: | Central Marine Fisheries Research Institute, Kochi-18, Kerala, India;
Coastal Aquaculture Authority, Ministry of Agriculture, Government of India, Chennai-600 006, Tamil Nadu, India |
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| Abstract: | Dried skipjack tuna ( Katsuwonus pelamis) waste (red meat, gills, viscera, fins, etc.) were mixed with 25% wheat flour and inoculated with a starter culture of Lactobacillus plantarum National Collection of Industrial Microorganisms (NCIM) 2912 (108–109 cells mL?1) and Bacillus licheniformis MTCC 6824 (107–108 cells mL?1). Changes in the nutritional quality (crude protein, crude fat, crude ash, crude fibre and nitrogen-free extract and aminoacids) were monitored during a fermentation period of 14 days. The proximate analysis showed significant changes in the composition of L. plantarum -fermented tuna (LPFT) and B. licheniformis -fermented tuna (BLFT) from the unfermented raw materials. Fermentation of tuna waste has resulted in a significant ( P <0.05) increase in the protein content of tuna waste between days 6 and 12. All the amino acid contents in BLFT increased during fermentation, whereas, in LPFT the levels of serine, histidine, tyrosine, methionine, cystine and phenylalanine contents were decreased. A marginal increase in calcium and phosphorus levels was recorded in the fermented products. The results of the study suggest that LPFT or BLFT can be used as a novel aquafeed ingredient for different fish species. |
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| Keywords: | biotransformation tuna waste co-fermentation aquafeed |
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