Show simple item record

dc.contributor.authorMcCarroll, Jak
dc.contributor.authorScott, Tim
dc.contributor.authorKing, EV
dc.contributor.authorMasselink, Gerd
dc.contributor.authorCiotti, Benjamin
dc.contributor.authorCloete, A
dc.contributor.authorSteyn, P-P
dc.contributor.authorBritz, P
dc.contributor.authorVine, NG
dc.contributor.authorDeyzel, SHP
dc.contributor.authorWitte, A
dc.contributor.authorClark, R
dc.date.accessioned2021-05-17T08:21:14Z
dc.date.available2021-05-17T08:21:14Z
dc.date.issued2021-07
dc.identifier.issn0044-8486
dc.identifier.issn1873-5622
dc.identifier.other736668
dc.identifier.urihttp://hdl.handle.net/10026.1/17120
dc.description.abstract

Understanding connectivity between abalone populations and residence times for pelagic larvae within suitable settlement habitats is critical for sustainable management of wild abalone stocks and ranching schemes. In the Eastern Cape region of South Africa, poaching has severely depleted wild abalone Haliotis midae populations. Rebuilding stock through larval seeding is being considered as a potentially viable method, though is hampered by a limited understanding of abalone habitat connectivity through larval dispersal, both at a regional and local scale. To address this shortcoming, we apply a multi-scale approach to investigate potential larval dispersal along the coastline of Eastern Cape, South Africa, examining both intra- and inter-site connectivity, with the primary focus at the local nearshore scale (< 40 m water depth) where surf zone processes have a strong influence. Delft3D is applied at a regional scale (400-km domain) and XBeach is used at a local scale (5-km domain) to model a known abalone habitat at Cape Recife at high-resolution (5-m cell size). Models were validated using field observations. Complex topo-bathymetry data for the local-scale model domain around Cape Recife were obtained using a state-of-the-art low-cost multi-method surveying approach. At a regional scale, sites with abalone habitat have the potential to be connected across distances of 50–100 km. However, a large sandy embayment (Algoa Bay; 100-km arc length) is likely to present an obstacle to larval transport in all but the most extreme and sustained wind and wave forcing conditions. The central Cape Recife abalone ranching area has the potential to act either as a self-seeding or meta-population connected site, depending on forcing conditions. At the local scale around Cape Recife, a zone of shallow gullies, under lower-energy waves, was determined to be the optimal release point to maximise residency times within the preferred rocky, shallow subtidal habitat of H. midae. Competent larvae released in this zone are predicted to have an order of magnitude greater residency than randomly seeded larvae. This study provides site-specific connectivity and residence time information for the Eastern Cape abalone fishery, but more generally it provides a novel multi-scale method to aid in planning and managing of abalone larval seeding for ranching and stock enhancement programs that could be applied in other locations.

dc.format.extent736668-736668
dc.languageen
dc.language.isoen
dc.publisherElsevier BV
dc.subjectLarval connectivity
dc.subjectDelft3D
dc.subjectXBeach
dc.subjectHydrodynamic modelling
dc.subjectAbalone ranching
dc.subjectStock enhancement
dc.subjectLarval seeding
dc.titleModelling regional and local-scale larval seeding strategies for abalone (H. midae) ranching in South Africa
dc.typejournal-article
dc.typeJournal Article
plymouth.author-urlhttps://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000649689000004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008
plymouth.volume540
plymouth.publication-statusPublished
plymouth.journalAquaculture
dc.identifier.doi10.1016/j.aquaculture.2021.736668
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering/School of Biological and Marine Sciences
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA07 Earth Systems and Environmental Sciences
plymouth.organisational-group/Plymouth/Research Groups
plymouth.organisational-group/Plymouth/Research Groups/Marine Institute
plymouth.organisational-group/Plymouth/Users by role
plymouth.organisational-group/Plymouth/Users by role/Academics
plymouth.organisational-group/Plymouth/Users by role/Researchers in ResearchFish submission
dcterms.dateAccepted2021-03-19
dc.rights.embargodate2022-3-22
dc.identifier.eissn1873-5622
dc.rights.embargoperiodNot known
rioxxterms.versionofrecord10.1016/j.aquaculture.2021.736668
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2021-07
rioxxterms.typeJournal Article/Review


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record


All items in PEARL are protected by copyright law.
Author manuscripts deposited to comply with open access mandates are made available in accordance with publisher policies. Please cite only the published version using the details provided on the item record or document. In the absence of an open licence (e.g. Creative Commons), permissions for further reuse of content should be sought from the publisher or author.
Theme by 
Atmire NV