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Sarker PK, Kapuscinski AR, McKuin B, Fitzgerald DS, Nash HM, Greenwood C. Microalgae-blend tilapia feed eliminates fishmeal and fish oil, improves growth, and is cost viable. Sci Rep 2020; 10:19328. [PMID: 33184333 PMCID: PMC7665073 DOI: 10.1038/s41598-020-75289-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 10/12/2020] [Indexed: 02/06/2023] Open
Abstract
Aquafeed manufacturers have reduced, but not fully eliminated, fishmeal and fish oil and are seeking cost competitive replacements. We combined two commercially available microalgae, to produce a high-performing fish-free feed for Nile tilapia (Oreochromis niloticus)—the world’s second largest group of farmed fish. We substituted protein-rich defatted biomass of Nannochloropsis oculata (leftover after oil extraction for nutraceuticals) for fishmeal and whole cells of docosahexaenoic acid (DHA)-rich Schizochytrium sp. as substitute for fish oil. We found significantly better (p < 0.05) growth, weight gain, specific growth rate, and best (but not significantly different) feed conversion ratio using the fish-free feed compared with the reference diet. Fish-free feed also yielded higher (p < 0.05) fillet lipid, DHA, and protein content (but not significantly different). Furthermore, fish-free feed had the highest degree of in-vitro protein hydrolysis and protein digestibility. The median economic conversion ratio of the fish-free feed ($0.95/kg tilapia) was less than the reference diet ($1.03/kg tilapia), though the median feed cost ($0.68/kg feed) was slightly greater than that of the reference feed ($0.64/kg feed) (p < 0.05). Our work is a step toward eliminating reliance on fishmeal and fish oil with evidence of a cost-competitive microalgae-based tilapia feed that improves growth metrics and the nutritional quality of farmed fish.
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Affiliation(s)
- Pallab K Sarker
- Environmental Studies Department, University of California Santa Cruz, Santa Cruz, CA, 95064, USA.
| | - Anne R Kapuscinski
- Environmental Studies Department, University of California Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Brandi McKuin
- Environmental Studies Department, University of California Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Devin S Fitzgerald
- Environmental Studies Department, University of California Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Hannah M Nash
- Health Professions Program, Sciences, Mathematics and Biotechnology, University of California Berkeley Extension, 1995 University Ave., Suite 200, Berkley, CA, 94704-7000, USA
| | - Connor Greenwood
- Environmental Studies Department, University of California Santa Cruz, Santa Cruz, CA, 95064, USA
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Zhai SW, Liu SL. Effects of Dietary Quercetin on Growth Performance, Serum Lipids Level and Body Composition of Tilapia (Oreochromis Niloticus). ITALIAN JOURNAL OF ANIMAL SCIENCE 2016. [DOI: 10.4081/ijas.2013.e85] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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