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Memorial University - Electronic Theses and Dissertations 4
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Document Description
TitleAssessment of the biology, ecology and genetic structure of the sea cucumber Cucumaria frondosa for management of the fishery in the Newfoundland and Labrador region
AuthorSo, Justin James.
DescriptionThesis (M.Sc.)--Memorial University of Newfoundland, 2009. Biology
Pagination1 v. (various foliations) : ill., maps (chiefly col.)
SubjectFishery management--Newfoundland and Labrador; Sea cucumbers--Ecology--Newfoundland and Labrador; Sea cucumbers--Newfoundland and Labrador--Genetics; Trepang fisheries--Newfoundland and Labrador
Degree GrantorMemorial University of Newfoundland. Dept. of Biology
Spatial CoverageCanada--Newfoundland and Labrador
NotesIncludes bibliographical references (leaves 3.26-3.38)
AbstractThe biological traits of the sea cucumber Cucumaria frondosa relevant from both ecological and resource management perspectives were investigated; including distribution, growth and predation on juveniles and adults, and population genetics. Natural densities were mainly dependent on substrate type and location. Spawning occurred from March to May in response to increasing phytoplankton abundance and larvae settled in ca. 5 weeks. Growth of juveniles and adults was slow (indicating ca. 25 years to reach market size) with seasonal patterns correlated with food supply. Juveniles of S. endeca fed upon post-metamorphic sea cucumbers, whereas adult feeding rates were modulated by temperature and biased towards small and injured sea cucumbers, suggesting that trawling may exacerbate predation pressure. Population genetic parameters are consistent with persistence in refugia through the last glacial maximum and local genetic patchiness is likely due to variations in recruitment. A precautionary management approach is advisable to ensure the sustainability of the fishery.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifiera3243839
RightsThe author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(20.86 MB) --
CONTENTdm file name43612.cpd