Food waste is a low-cost and nutritious source of feed which could be beneficial to the fishery industry. The objective of this study was to use fermented food wastes as major sources of protein to replace the fish meal used in fish feeds for culturing jade perch (Scortum barcoo) and Nile tilapia (Oreochromis niloticus). Two experiments (a laboratory and a field trial) were conducted to test the suitability of the fish feeds for the two fish species. In the laboratory trial, six out of seven formulations (six food waste-based formulations and one commercial diet as control) were tested on jade perch whereas four out of the seven formulations were tested on Nile tilapia to study the effects of the diets on the growth performance and serum immunological parameters of fish. The formulations (Diet F and Diet A) with the best growth performance (feed conversion ratio (FCR) of jade perch (1.98) and Nile tilapia (1.28)) while having the lowest amount of fish meal (5%) were selected for field scale feeding trial. In addition, the percentage of fermented food waste ingredient in fish feed (Diet A and Diet F) was about 50% without causing significant effects on the immunity (P < 0.05) of the two fish species when compared with control diet. In the field scale feeding trial, FCR values of jade perch and Nile tilapia fed with Diet F and A were 1.06 and 1.16, respectively, which were similar to the control diet (P > 0.05). Metal/loids concentrations in fish tissue showed that both fish species fed with food waste-based pellets (Nile tilapia) Diet A: As (0.028 mg/kg), Cd (0.011 mg/kg), Cr (0.163 mg/kg), Cu (0.851 mg/kg), Hg (0.141 mg/kg), Pb (0.081 mg/kg) and Zn (30.8 mg/kg)) and jade perch Diet F: As (0.709 mg/kg), Cd (0.026 mg/kg), Cr (0.300 mg/kg), Cu (2.49 mg/kg), Hg (0.318 mg/kg), Pb (1.745 mg/kg) and Zn (40.9 mg/kg) were all below the maximum permissible levels of the local standard (As (ASO) = 6 mg/kg; Cd = 2 mg/kg; Cr = 1 mg/kg; Pb = 6 mg/kg; Hg = 0.5 mg/kg), while no permissible levels of Cu and Pb are stipulated by the standard. The results of the human health risk assessment indicated that the fish cultured with food waste-based diets were generally safe for human consumption (Hazard Index values: 0.075-0.054; cancer risk range: 2.14-8.15 × 10). The present study revealed that fermented food waste could serve as protein substitute in fish feed for the culture of quality jade perch and Nile tilapia for human consumption.
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http://dx.doi.org/10.1016/j.jenvman.2019.01.102 | DOI Listing |
R Soc Open Sci
May 2024
School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales, Australia.
Probiotics Antimicrob Proteins
March 2024
School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
The demands of intensified aquaculture production and escalating disease prevalence underscore the need for efficacious probiotic strategies to enhance fish health. This study focused on isolating and characterising potential probiotics from the gut microbiota of the emerging aquaculture species jade perch (Scortum barcoo). Eighty-seven lactic acid bacteria and 149 other bacteria were isolated from the digestive tract of five adult jade perch.
View Article and Find Full Text PDFIn recent years, new species descriptions for the North American darters have proliferated. Most species concepts accepted by contemporary ichthyologists require that a valid species be both monophyletic and diagnoseable, yet many lineages exhibit modal or range differences in morphological characteristics without individuals being diagnosable. Such scenarios present difficulties with regards to proper taxonomic recognition of divergent lineages and often prohibit appropriate conservation action.
View Article and Find Full Text PDFJ Vet Diagn Invest
May 2024
CityU Veterinary Diagnostic Laboratory, City University of Hong Kong, Kowloon Tong, Hong Kong, SAR China.
Non-neoplastic thyroid hyperplasia is common in terrestrial animals, secondary to nutritional imbalances or other goitrogenic compounds. Thyroid hyperplasia is relatively common in teleost fish; however, malignant thyroid neoplasia is rarely reported. We diagnosed cases of thyroid neoplasia in a population of jade perch ().
View Article and Find Full Text PDFInt J Biol Macromol
January 2024
Key Laboratory of Conservation and Application in Biodiversity of South China, School of life Sciences, Guangzhou University, Guangzhou 510006, PR China. Electronic address:
Toll like receptors (TLRs) are important pattern recognition receptors participating in innate immune system. Up to now, no TLR has been identified in Jade perch (Scortum barcoo). In this study, we successfully identified 9 members of TLRs from the Jade perch.
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