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Limited potential to recover from overfishing raises concerns for deep-sea sharks, rays and chimaeras

Simpfendorfer, CA and Kyne, Peter M. (2009). Limited potential to recover from overfishing raises concerns for deep-sea sharks, rays and chimaeras. Environmental Conservation,36(2):97-103.

Document type: Journal Article

IRMA ID 83093774xPUB248
Title Limited potential to recover from overfishing raises concerns for deep-sea sharks, rays and chimaeras
Author Simpfendorfer, CA
Kyne, Peter M.
Journal Name Environmental Conservation
Publication Date 2009
Volume Number 36
Issue Number 2
ISSN 0376-8929   (check CDU catalogue open catalogue search in new window)
Start Page 97
End Page 103
Total Pages 7
Place of Publication UK
Publisher Cambridge University Press
HERDC Category C1 - Journal Article (DEST)
Abstract As global fishing effort increasingly expands into deeper water, concerns exist over the ability of deepsea fishes to sustain fisheries. There is however little quantitative evidence to support these concerns for the deep-sea cartilaginous fishes (Chondrichthyes: sharks, rays and chimaeras). This paper compiled available life history data for this group to analyse their ability to rebound from population declines relative to continental shelf and pelagic species. Deepsea cartilaginous fishes have rates of population increase that are on average less than half those of shelf and pelagic species, and include the lowest levels observed to date. Population doubling times indicate that once a stock has been depleted, it will take decades, and potentially centuries, before it will recover. Furthermore, population recovery rates decrease with increasing depth, suggesting species that occur deepest are those most vulnerable to fishing. These results provide the first assessment of the productivity of deep-sea chondrichthyans, highlighting that precautionary management of developing deepsea fisheries is essential if stocks and biodiversity are to be maintained.
Keywords Chondrichthyes
elasmobranchs
intrinsic rebound potential
life history
population doubling time
DOI http://dx.doi.org/10.1017/S0376892909990191   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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