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Balancing fishery and conservation: a case study of the barrel jellyfishRhizostoma octopusin South Wales

Anna Elliott, Victoria Hobson, Kam Tang Orcid Logo

ICES Journal of Marine Science: Journal du Conseil, Volume: 74, Pages: 234 - 241

Swansea University Author: Kam Tang Orcid Logo

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DOI (Published version): 10.1093/icesjms/fsw157

Abstract

In Wales, the barrel jellyfish Rhizostoma octopus is commercially harvested to produce high-value medical grade collagen. While the fishery is presently not regulated, there are concerns how it may affect the leatherback turtle (Dermochelys coriacea), which preys on R. octopus in local waters. We co...

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Published in: ICES Journal of Marine Science: Journal du Conseil
ISSN: 1054-3139 1095-9289
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa29636
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We combined monitoring data and morphometric and weight measurements in models to estimate the potential impact of R. octopus fishery on foraging turtles. We found a significant quadratic relationship between bell diameter and wet weight of R. octopus, with bell diameter explaining 88% of the variability in wet weight. R. octopus biomass in the Carmarthen Bay varied inter-annually between 38.9 and 594.2 tonnes y-1. The amount of R. octopus needed to satisfy a leatherback turtle&#x2019;s daily energetic requirements was estimated at 85.1-319.1 kg. Using leatherback turtle sighting data, our models show that during a jellyfish &#x2018;low year,&#x2019; the R. octopus population could be completely depleted by an average of two foraging turtles along with the current level of commercial harvesting (4.3 tonnes). During a jellyfish &#x2018;high year,&#x2019; the current level of commercial harvesting is predicted to have relatively little impact on food supply for even the maximum number of foraging leatherback turtle reported in the area. However, uncertainties related to the jellyfish&#x2019;s life cycle in the local waters need to be resolved for proper management of this emerging fishery.</abstract><type>Journal Article</type><journal>ICES Journal of Marine Science: Journal du Conseil</journal><volume>74</volume><paginationStart>234</paginationStart><paginationEnd>241</paginationEnd><publisher/><issnPrint>1054-3139</issnPrint><issnElectronic>1095-9289</issnElectronic><keywords>Barrel jellyfish; Conservation; Leatherback turtle; Rhizostomeae; Rhizostoma octopus; Fishery</keywords><publishedDay>31</publishedDay><publishedMonth>12</publishedMonth><publishedYear>2017</publishedYear><publishedDate>2017-12-31</publishedDate><doi>10.1093/icesjms/fsw157</doi><url/><notes>The giant barrel jellyfish R. octopus is occurring in increasing frequency along the coast of South Wales, UK. This observation has prompted a new fishery harvesting the jellyfish to produce high-value medical grade collagen. This new fishery is presently not regulated, but there is concern how it may affect the leatherback turtle that forages in the region. We used morphometric and weight measurements of the barrel jellyfish, and sighting data of the leatherback turtle, in models to investigate the potential impact of a jellyfish fishery on the leatherback turtle. 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spelling 2017-02-06T09:35:53.2241044 v2 29636 2016-08-24 Balancing fishery and conservation: a case study of the barrel jellyfishRhizostoma octopusin South Wales 69af43a3b9da24aef65c5d3a44956fe3 0000-0001-9427-9564 Kam Tang Kam Tang true false 2016-08-24 BGPS In Wales, the barrel jellyfish Rhizostoma octopus is commercially harvested to produce high-value medical grade collagen. While the fishery is presently not regulated, there are concerns how it may affect the leatherback turtle (Dermochelys coriacea), which preys on R. octopus in local waters. We combined monitoring data and morphometric and weight measurements in models to estimate the potential impact of R. octopus fishery on foraging turtles. We found a significant quadratic relationship between bell diameter and wet weight of R. octopus, with bell diameter explaining 88% of the variability in wet weight. R. octopus biomass in the Carmarthen Bay varied inter-annually between 38.9 and 594.2 tonnes y-1. The amount of R. octopus needed to satisfy a leatherback turtle’s daily energetic requirements was estimated at 85.1-319.1 kg. Using leatherback turtle sighting data, our models show that during a jellyfish ‘low year,’ the R. octopus population could be completely depleted by an average of two foraging turtles along with the current level of commercial harvesting (4.3 tonnes). During a jellyfish ‘high year,’ the current level of commercial harvesting is predicted to have relatively little impact on food supply for even the maximum number of foraging leatherback turtle reported in the area. However, uncertainties related to the jellyfish’s life cycle in the local waters need to be resolved for proper management of this emerging fishery. Journal Article ICES Journal of Marine Science: Journal du Conseil 74 234 241 1054-3139 1095-9289 Barrel jellyfish; Conservation; Leatherback turtle; Rhizostomeae; Rhizostoma octopus; Fishery 31 12 2017 2017-12-31 10.1093/icesjms/fsw157 The giant barrel jellyfish R. octopus is occurring in increasing frequency along the coast of South Wales, UK. This observation has prompted a new fishery harvesting the jellyfish to produce high-value medical grade collagen. This new fishery is presently not regulated, but there is concern how it may affect the leatherback turtle that forages in the region. We used morphometric and weight measurements of the barrel jellyfish, and sighting data of the leatherback turtle, in models to investigate the potential impact of a jellyfish fishery on the leatherback turtle. The novel findings provide the basis for managing this new fishery in a manner that is sustainable and compatible with the leatherback turtle conservation effort. COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2017-02-06T09:35:53.2241044 2016-08-24T08:40:47.2820872 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Anna Elliott 1 Victoria Hobson 2 Kam Tang 0000-0001-9427-9564 3 0029636-06022017093525.pdf ICES74.pdf 2017-02-06T09:35:25.5970000 Output 666976 application/pdf Version of Record true 2018-02-06T00:00:00.0000000 false 0029636-24082016084347.pdf ICES_author_final_version.pdf 2016-08-24T08:43:47.1070000 Output 3736309 application/pdf Accepted Manuscript true 2017-09-20T00:00:00.0000000 true
title Balancing fishery and conservation: a case study of the barrel jellyfishRhizostoma octopusin South Wales
spellingShingle Balancing fishery and conservation: a case study of the barrel jellyfishRhizostoma octopusin South Wales
Kam Tang
title_short Balancing fishery and conservation: a case study of the barrel jellyfishRhizostoma octopusin South Wales
title_full Balancing fishery and conservation: a case study of the barrel jellyfishRhizostoma octopusin South Wales
title_fullStr Balancing fishery and conservation: a case study of the barrel jellyfishRhizostoma octopusin South Wales
title_full_unstemmed Balancing fishery and conservation: a case study of the barrel jellyfishRhizostoma octopusin South Wales
title_sort Balancing fishery and conservation: a case study of the barrel jellyfishRhizostoma octopusin South Wales
author_id_str_mv 69af43a3b9da24aef65c5d3a44956fe3
author_id_fullname_str_mv 69af43a3b9da24aef65c5d3a44956fe3_***_Kam Tang
author Kam Tang
author2 Anna Elliott
Victoria Hobson
Kam Tang
format Journal article
container_title ICES Journal of Marine Science: Journal du Conseil
container_volume 74
container_start_page 234
publishDate 2017
institution Swansea University
issn 1054-3139
1095-9289
doi_str_mv 10.1093/icesjms/fsw157
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 In Wales, the barrel jellyfish Rhizostoma octopus is commercially harvested to produce high-value medical grade collagen. While the fishery is presently not regulated, there are concerns how it may affect the leatherback turtle (Dermochelys coriacea), which preys on R. octopus in local waters. We combined monitoring data and morphometric and weight measurements in models to estimate the potential impact of R. octopus fishery on foraging turtles. We found a significant quadratic relationship between bell diameter and wet weight of R. octopus, with bell diameter explaining 88% of the variability in wet weight. R. octopus biomass in the Carmarthen Bay varied inter-annually between 38.9 and 594.2 tonnes y-1. The amount of R. octopus needed to satisfy a leatherback turtle’s daily energetic requirements was estimated at 85.1-319.1 kg. Using leatherback turtle sighting data, our models show that during a jellyfish ‘low year,’ the R. octopus population could be completely depleted by an average of two foraging turtles along with the current level of commercial harvesting (4.3 tonnes). During a jellyfish ‘high year,’ the current level of commercial harvesting is predicted to have relatively little impact on food supply for even the maximum number of foraging leatherback turtle reported in the area. However, uncertainties related to the jellyfish’s life cycle in the local waters need to be resolved for proper management of this emerging fishery.
published_date 2017-12-31T16:05:59Z
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