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Optimization of rearing techniques for cultured marine polychaetes (Nereis virens) using sustainably sourced ingredients. / Lily-Delancey Pauls

Swansea University Author: Lily-Delancey Pauls

Abstract

The decrease in wild fish stocks has led to a search for novel feed sources to supply the aquaculture industry. Polychaetes have recently been identified as suitable feed ingredients due to their favourable nutritional composition, especially their lipid profile which is high in unsaturated fatty ac...

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Published: 2009
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42755
first_indexed 2018-08-02T18:55:28Z
last_indexed 2018-08-03T10:11:00Z
id cronfa42755
recordtype RisThesis
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spelling 2018-08-02T16:24:30.3673959 v2 42755 2018-08-02 Optimization of rearing techniques for cultured marine polychaetes (Nereis virens) using sustainably sourced ingredients. f1a3f20d37e342a0ff7c61becadc2f48 NULL Lily-Delancey Pauls Lily-Delancey Pauls true true 2018-08-02 The decrease in wild fish stocks has led to a search for novel feed sources to supply the aquaculture industry. Polychaetes have recently been identified as suitable feed ingredients due to their favourable nutritional composition, especially their lipid profile which is high in unsaturated fatty acids. As ragworm farms have started to develop, there has been a need to understand and improve rearing techniques, in particular the dietary requirements and nutritional profile of the ragworm. In this thesis, research was focused on the king ragworm. Nereis virens. The protein and energy requirements were identified by increasing inclusion levels of nutrients in the diet as well as manipulating feed rations from starvation to satiation. Weight gain, survival, ingested feed as well as protein and energy retention efficiencies were evaluated. Results demonstrated that N. virens gained a proportional amount of nutrient in relation to the amount ingested up to a critical amount when gain either stagnated or decreased. A pattern of nutrient retention and maintenance requirements for different weight classes were calculated. This data was then used for bioenergetic modelling to calculate nutrient requirements using the equation: Requirement: a x BW (g) + c x growth The energy maintenance requirement was found to be 18 J g-1 worm day-1; for protein, the requirement was 0.19 mg g-1 worm day-1. The predicted weight gain (g) for a worm of any given size (g) was y = 0.015g1.106. The total nutrient requirement is the sum of maintenance and growth, including the constant c which is the cost of nutrient deposition. Alternative feed sources were also investigated to observe the extent at which N. virens can utilize novel sources and their abilities to preserve or convert highly unsaturated fatty acids such as EPA and DHA. Results showed a high adaptability to terrestrial animal or vegetable based feed sources but an inability to convert shorter chain or n-6 fatty acids when fed non-marine based feeds. There may however be potential for N. virens to utilize other feed sources from its natural environment to supplement n-3 HUFA content. E-Thesis Aquatic sciences. 31 12 2009 2009-12-31 COLLEGE NANME Biosciences COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:30.3673959 2018-08-02T16:24:30.3673959 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Lily-Delancey Pauls NULL 1 0042755-02082018162519.pdf 10807524.pdf 2018-08-02T16:25:19.4300000 Output 8231751 application/pdf E-Thesis true 2018-08-02T16:25:19.4300000 false
title Optimization of rearing techniques for cultured marine polychaetes (Nereis virens) using sustainably sourced ingredients.
spellingShingle Optimization of rearing techniques for cultured marine polychaetes (Nereis virens) using sustainably sourced ingredients.
Lily-Delancey Pauls
title_short Optimization of rearing techniques for cultured marine polychaetes (Nereis virens) using sustainably sourced ingredients.
title_full Optimization of rearing techniques for cultured marine polychaetes (Nereis virens) using sustainably sourced ingredients.
title_fullStr Optimization of rearing techniques for cultured marine polychaetes (Nereis virens) using sustainably sourced ingredients.
title_full_unstemmed Optimization of rearing techniques for cultured marine polychaetes (Nereis virens) using sustainably sourced ingredients.
title_sort Optimization of rearing techniques for cultured marine polychaetes (Nereis virens) using sustainably sourced ingredients.
author_id_str_mv f1a3f20d37e342a0ff7c61becadc2f48
author_id_fullname_str_mv f1a3f20d37e342a0ff7c61becadc2f48_***_Lily-Delancey Pauls
author Lily-Delancey Pauls
author2 Lily-Delancey Pauls
format E-Thesis
publishDate 2009
institution Swansea University
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 The decrease in wild fish stocks has led to a search for novel feed sources to supply the aquaculture industry. Polychaetes have recently been identified as suitable feed ingredients due to their favourable nutritional composition, especially their lipid profile which is high in unsaturated fatty acids. As ragworm farms have started to develop, there has been a need to understand and improve rearing techniques, in particular the dietary requirements and nutritional profile of the ragworm. In this thesis, research was focused on the king ragworm. Nereis virens. The protein and energy requirements were identified by increasing inclusion levels of nutrients in the diet as well as manipulating feed rations from starvation to satiation. Weight gain, survival, ingested feed as well as protein and energy retention efficiencies were evaluated. Results demonstrated that N. virens gained a proportional amount of nutrient in relation to the amount ingested up to a critical amount when gain either stagnated or decreased. A pattern of nutrient retention and maintenance requirements for different weight classes were calculated. This data was then used for bioenergetic modelling to calculate nutrient requirements using the equation: Requirement: a x BW (g) + c x growth The energy maintenance requirement was found to be 18 J g-1 worm day-1; for protein, the requirement was 0.19 mg g-1 worm day-1. The predicted weight gain (g) for a worm of any given size (g) was y = 0.015g1.106. The total nutrient requirement is the sum of maintenance and growth, including the constant c which is the cost of nutrient deposition. Alternative feed sources were also investigated to observe the extent at which N. virens can utilize novel sources and their abilities to preserve or convert highly unsaturated fatty acids such as EPA and DHA. Results showed a high adaptability to terrestrial animal or vegetable based feed sources but an inability to convert shorter chain or n-6 fatty acids when fed non-marine based feeds. There may however be potential for N. virens to utilize other feed sources from its natural environment to supplement n-3 HUFA content.
published_date 2009-12-31T04:24:13Z
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score 11.453587

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