Biotransformation of tuna waste by co-fermentation into an aquafeed ingredient

Authors: Vijayan, Hena¹; Joseph, Imelda²; Raj, Rajaian Paul²

Source: Aquaculture Research, Volume 40, Number 9, June 2009 , pp. 1047-1053(7)

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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.

Keywords: biotransformation; tuna waste; co-fermentation; aquafeed

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1365-2109.2009.02197.x

Affiliations: 1: Central Marine Fisheries Research Institute, Kochi-18, Kerala, India 2: Coastal Aquaculture Authority, Ministry of Agriculture, Government of India, Chennai-600 006, Tamil Nadu, India

Publication date: 2009-06-01