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Microalgae in aquaculture feeds for Nile tilapia, and the feasibility of urban aquaponics / SAMUEL FILES

Swansea University Author: SAMUEL FILES

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Abstract

This thesis develops understanding of microalgae in Nile tilapia (Oreochromis. niloticus) feed, implications for aquaponics and how consumer perceptions influence feasibility of urban aquaponics. Aquaponics is the growing of crops, utilising nutrients from fish waste. Chapter one is a meta-analysis...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Master of Research
Degree name: MSc by Research
Supervisor: Garcia de Leaniz, Carlos ; Consuegra, Sofia
URI: https://cronfa.swan.ac.uk/Record/cronfa61646
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first_indexed 2022-10-24T13:18:14Z
last_indexed 2023-01-13T19:22:31Z
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spelling 2022-10-24T14:34:01.3785436 v2 61646 2022-10-24 Microalgae in aquaculture feeds for Nile tilapia, and the feasibility of urban aquaponics 7ba661fabe55b70f8bbe3ab03b745472 SAMUEL FILES SAMUEL FILES true false 2022-10-24 This thesis develops understanding of microalgae in Nile tilapia (Oreochromis. niloticus) feed, implications for aquaponics and how consumer perceptions influence feasibility of urban aquaponics. Aquaponics is the growing of crops, utilising nutrients from fish waste. Chapter one is a meta-analysis (36 papers) on the effects of microalgae inclusion on O. niloticus. This was done to determine if fish meal (FM) in aquaculture feeds can be replaced with microalgae, without being detrimental, to reduce pressure on wild fish stocks. An inclusion of microalgae, up to 30%, is beneficial to O. niloticus with no detrimental impacts. Effect sizes for specific growth rate (-0.15) and feed conversion ratio (-0.30) indicate microalgae can replace FM. Chapter two assesses effects of feed on water parameters (Ammonia etc) in O. niloticus systems, by systematic review. Optimal water parameters for O. niloticus are understood, but effects of feed type and quantity are poorly researched, which needs rectifying. Feed type has little importance, and feed quantity has overriding impact on water parameters. Chapter three investigates palatability of digestate cultured microalgae (DCM, Nannochloropsis & Scenedesmus), cultured on membrane microfiltered, food waste digestate on O. niloticus, assessing the possibility of DCM as an alternative to FM. Time to react, pellets eaten and ejected determined palatability. There were no statistically significant results (P>0.05), indicating that an alternative feed is as palatable as commercial feed. Chapter four examined feasibility of urban aquaponics via a consumer survey (254 participants), as future innovative farming will utilise space in urban areas (Biophilic living project). It created a baseline of perceptions in the UK, which could tailor systems/inform public on aquaponics based on current knowledge. 30% of participants had heard of aquaponics, but showed reservations to costs. Attitudes are neutral or in favour to aquaponics, but considerations are needed for location, product choice and system design. E-Thesis Swansea Microalgae, Nile tilapia, Digestate, Aquaponics, Feed, Consumer perceptions 19 10 2022 2022-10-19 ORCiD identifier: https://orcid.org/0000-0002-3889-2089 COLLEGE NANME COLLEGE CODE Swansea University Garcia de Leaniz, Carlos ; Consuegra, Sofia Master of Research MSc by Research Kess 2 East, Powell Dobson architecture 2022-10-24T14:34:01.3785436 2022-10-24T14:14:53.5882701 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences SAMUEL FILES 1 61646__25563__d8ff79b8325c4d579fb703d974c26ec7.pdf Files_Samuel_J_MSc_Thesis_Final_Redacted_Signature.pdf 2022-10-24T14:28:42.8205410 Output 8143878 application/pdf E-Thesis – open access true Copyright: The author, Samuel J. Files, 2022 true eng
title Microalgae in aquaculture feeds for Nile tilapia, and the feasibility of urban aquaponics
spellingShingle Microalgae in aquaculture feeds for Nile tilapia, and the feasibility of urban aquaponics
SAMUEL FILES
title_short Microalgae in aquaculture feeds for Nile tilapia, and the feasibility of urban aquaponics
title_full Microalgae in aquaculture feeds for Nile tilapia, and the feasibility of urban aquaponics
title_fullStr Microalgae in aquaculture feeds for Nile tilapia, and the feasibility of urban aquaponics
title_full_unstemmed Microalgae in aquaculture feeds for Nile tilapia, and the feasibility of urban aquaponics
title_sort Microalgae in aquaculture feeds for Nile tilapia, and the feasibility of urban aquaponics
author_id_str_mv 7ba661fabe55b70f8bbe3ab03b745472
author_id_fullname_str_mv 7ba661fabe55b70f8bbe3ab03b745472_***_SAMUEL FILES
author SAMUEL FILES
author2 SAMUEL FILES
format E-Thesis
publishDate 2022
institution Swansea University
college_str Faculty of Science and Engineering
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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
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description This thesis develops understanding of microalgae in Nile tilapia (Oreochromis. niloticus) feed, implications for aquaponics and how consumer perceptions influence feasibility of urban aquaponics. Aquaponics is the growing of crops, utilising nutrients from fish waste. Chapter one is a meta-analysis (36 papers) on the effects of microalgae inclusion on O. niloticus. This was done to determine if fish meal (FM) in aquaculture feeds can be replaced with microalgae, without being detrimental, to reduce pressure on wild fish stocks. An inclusion of microalgae, up to 30%, is beneficial to O. niloticus with no detrimental impacts. Effect sizes for specific growth rate (-0.15) and feed conversion ratio (-0.30) indicate microalgae can replace FM. Chapter two assesses effects of feed on water parameters (Ammonia etc) in O. niloticus systems, by systematic review. Optimal water parameters for O. niloticus are understood, but effects of feed type and quantity are poorly researched, which needs rectifying. Feed type has little importance, and feed quantity has overriding impact on water parameters. Chapter three investigates palatability of digestate cultured microalgae (DCM, Nannochloropsis & Scenedesmus), cultured on membrane microfiltered, food waste digestate on O. niloticus, assessing the possibility of DCM as an alternative to FM. Time to react, pellets eaten and ejected determined palatability. There were no statistically significant results (P>0.05), indicating that an alternative feed is as palatable as commercial feed. Chapter four examined feasibility of urban aquaponics via a consumer survey (254 participants), as future innovative farming will utilise space in urban areas (Biophilic living project). It created a baseline of perceptions in the UK, which could tailor systems/inform public on aquaponics based on current knowledge. 30% of participants had heard of aquaponics, but showed reservations to costs. Attitudes are neutral or in favour to aquaponics, but considerations are needed for location, product choice and system design.
published_date 2022-10-19T04:20:37Z
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