Fishmeal replacement by periphyton reduces the fish in fish out ratio and alimentation cost in gilthead sea bream Sparus aurata

Gilda  Savonitto; Roy Barkan; Sheenan  Harpaz; amir Neori; Helena  Chernova; Antonio  Terlizzi; Lior Guttman

doi:10.1038/s41598-021-00466-5

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Fishmeal replacement by periphyton reduces the fish in fish out ratio and alimentation cost in gilthead sea bream Sparus aurata

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Fishmeal replacement by periphyton reduces the fish in fish out ratio and alimentation cost in gilthead sea bream Sparus aurata

Gilda Savonitto, Roy Barkan, Sheenan Harpaz, amir Neori, Helena Chernova, Antonio Terlizzi and Lior Guttman

Scientific Reports, Vol.11(1), pp.1-10

2021

DOI: https://doi.org/10.1038/s41598-021-00466-5

PMID: 34697365

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Abstract

environmental impact

ichthyology

Aquaculture threatens natural resources by fishing down the sea to supply fishmeal. Alternative protein sources in aquafeeds can provide a solution, particularly those that are waste from other operations and thereby reduce feed production costs. Toward this goal, we examined the waste biomass of marine periphyton from biofilters of an integrated multi-trophic aquaculture (IMTA) system as a replacement for fishmeal in diets of gilthead seabream (Sparus aurata). Four isoproteic (41%) and isolipidic (16.7%) aquafeeds were formulated with increased content of periphyton and a corresponding decrease in fishmeal from 20 to 15, 10, or 0%. The growth and biochemical content of seabream fingerlings (initial body weight 10 g) were examined over 132 days. Replacing 50% of fishmeal by waste periphyton improved feed conversion ratio (1.2 vs. 1.35 in the control diet) without harming fish growth. The complete replacement of fishmeal with periphyton resulted in 15% slower growth but significantly higher protein content in the fish flesh (59 vs. 52% in the control diet). Halving fishmeal content reduced feed cost by US$ 0.13 kg−1 feed and saved 30% in the cost of conversion of feed to fish biomass (US$ 0.58 kg−1 produced fish vs. $0.83 in the control diet). Finally, the total replacement of fishmeal by waste periphyton in the diet reduced the fish in—fish out ratio to below 1 (0.5–0.9) as compared to 1.36 in the control diet. Replacing fishmeal with on-farm produced periphyton minimizes aquaculture footprint through the removal of excess nutrients in effluents and the use of waste biomass to reduce the ‘fish in’ content in aquafeeds and fish production costs. The present study demonstrates the great practical potential of this dual use of marine periphyton in enhancing the circular economy concept in sustainable fish production.

Details

Title: Fishmeal replacement by periphyton reduces the fish in fish out ratio and alimentation cost in gilthead sea bream Sparus aurata
Authors: Gilda Savonitto - Israel Oceanographic and Limnological Research
Roy Barkan - Israel Oceanographic and Limnological Research
Sheenan Harpaz - Agricultural Research Organization
amir Neori - University of Haifa
Helena Chernova - Israel Oceanographic and Limnological Research
Antonio Terlizzi - University of Trieste
Lior Guttman (Corresponding Author) - Israel Oceanographic and Limnological Research
Publication details: Scientific Reports, Vol.11(1), pp.1-10
Publisher: Nature Publishing Group
Date published: 2021
DOI: 10.1038/s41598-021-00466-5
ISSN: 2045-2322
PMID: 34697365
Copyright note: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Grant note: The research was supported by the Israeli Ministry of Agriculture and Rural Development Grant No. 894-0193-13.
Organisation Unit: School of Health
Language: English
Record Identifier: 991213079702621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Fisheries