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Nutritional benefits of microalga oil replacement in tilapia farming / SERGIO TREVI

Swansea University Author: SERGIO TREVI

DOI (Published version): 10.23889/SUthesis.60027

Abstract

Schizochytrium oil is currently the only commercially available microalgae oil to replace plant and fish oils in Nile tilapia diets, however there are some uncertainties on its benefits and optimal replacement level. To systematically evaluate the benefits of Schizochytrium in fish nutrition, a meta...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Garcia de Leaniz, Carlos ; Consuegra, Sofia ; Webster, Tamsyn U.,
URI: https://cronfa.swan.ac.uk/Record/cronfa60027
first_indexed 2022-05-16T09:09:52Z
last_indexed 2022-05-17T03:36:28Z
id cronfa60027
recordtype RisThesis
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spelling 2022-05-16T11:18:11.4509299 v2 60027 2022-05-16 Nutritional benefits of microalga oil replacement in tilapia farming 47e944666cf8f1e6193657d10b012458 SERGIO TREVI SERGIO TREVI true false 2022-05-16 Schizochytrium oil is currently the only commercially available microalgae oil to replace plant and fish oils in Nile tilapia diets, however there are some uncertainties on its benefits and optimal replacement level. To systematically evaluate the benefits of Schizochytrium in fish nutrition, a metanalysis was conducted. Its results indicated that an inclusion of Schizochytrium did not result in loss of omega-3 content of the fish fillet (SMD = 0.62; 95%CI = -0.51-1.76). To assess the effects on survival and changes in the gut microbiota (16S rRNA sequencing) of Nile tilapia, Schizochytrium oil was incorporated in the fish diet. Microalgae-oil in the diet increased growth rate without impacting on fish survival. Plant oil caused an increase in the abundance of Aeromonadaceae in the gut, but this was not the case with microalgae oil was used. To characterize the long-term effects of microalgae oil, Nile tilapia from the previous experiment were fed on the same diets for 11 months. Schizochytrium oil in the diet increased the omega-3 content of the Nile tilapia fillet up to 32.30±1.13%. The benefits of Schizochytrium oil replacement was also tested on Manyara tilapia (Oreochromis amphimelas), an endangered species. Schizochytrium oil increased fish growth and omega-3 content of the flesh up to 32.68±0.25%. Gonad development was not affected by Schizochytrium oil in the diet. The results of this thesis indicate, that Schizochytrium oil can replace fish-based oils in the diet of Nile tilapia without compromising survival or disrupting the composition of the gut-microbiome as plant-based diets do, whileat the same time improving growth and omega-3 content of the fillet in both Nile and Manyara tilapia thus representing a better alternative to fish oils than plant-based oils. E-Thesis Swansea Tilapia, microalgae, aquaculture nutrition 10 5 2022 2022-05-10 10.23889/SUthesis.60027 COLLEGE NANME COLLEGE CODE Swansea University Garcia de Leaniz, Carlos ; Consuegra, Sofia ; Webster, Tamsyn U., Doctoral Ph.D Swansea University, Centre for Sustainable Aquaculture Research; Grant number: BUR0024434 2022-05-16T11:18:11.4509299 2022-05-16T10:05:20.5160486 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences SERGIO TREVI 1 60027__24081__b51ead5157f44fa0b7e1086d14f23220.pdf Trevi_Sergio_PhD_Thesis_Final_Redacted_Signature.pdf 2022-05-16T10:18:27.2745767 Output 3821781 application/pdf E-Thesis – open access true Copyright: The author, Sergio Trevi, 2022. true eng
title Nutritional benefits of microalga oil replacement in tilapia farming
spellingShingle Nutritional benefits of microalga oil replacement in tilapia farming
SERGIO TREVI
title_short Nutritional benefits of microalga oil replacement in tilapia farming
title_full Nutritional benefits of microalga oil replacement in tilapia farming
title_fullStr Nutritional benefits of microalga oil replacement in tilapia farming
title_full_unstemmed Nutritional benefits of microalga oil replacement in tilapia farming
title_sort Nutritional benefits of microalga oil replacement in tilapia farming
author_id_str_mv 47e944666cf8f1e6193657d10b012458
author_id_fullname_str_mv 47e944666cf8f1e6193657d10b012458_***_SERGIO TREVI
author SERGIO TREVI
author2 SERGIO TREVI
format E-Thesis
publishDate 2022
institution Swansea University
doi_str_mv 10.23889/SUthesis.60027
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description Schizochytrium oil is currently the only commercially available microalgae oil to replace plant and fish oils in Nile tilapia diets, however there are some uncertainties on its benefits and optimal replacement level. To systematically evaluate the benefits of Schizochytrium in fish nutrition, a metanalysis was conducted. Its results indicated that an inclusion of Schizochytrium did not result in loss of omega-3 content of the fish fillet (SMD = 0.62; 95%CI = -0.51-1.76). To assess the effects on survival and changes in the gut microbiota (16S rRNA sequencing) of Nile tilapia, Schizochytrium oil was incorporated in the fish diet. Microalgae-oil in the diet increased growth rate without impacting on fish survival. Plant oil caused an increase in the abundance of Aeromonadaceae in the gut, but this was not the case with microalgae oil was used. To characterize the long-term effects of microalgae oil, Nile tilapia from the previous experiment were fed on the same diets for 11 months. Schizochytrium oil in the diet increased the omega-3 content of the Nile tilapia fillet up to 32.30±1.13%. The benefits of Schizochytrium oil replacement was also tested on Manyara tilapia (Oreochromis amphimelas), an endangered species. Schizochytrium oil increased fish growth and omega-3 content of the flesh up to 32.68±0.25%. Gonad development was not affected by Schizochytrium oil in the diet. The results of this thesis indicate, that Schizochytrium oil can replace fish-based oils in the diet of Nile tilapia without compromising survival or disrupting the composition of the gut-microbiome as plant-based diets do, whileat the same time improving growth and omega-3 content of the fillet in both Nile and Manyara tilapia thus representing a better alternative to fish oils than plant-based oils.
published_date 2022-05-10T08:11:06Z
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