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Environmental Influences on South African Fish Catch : South Coast Transition
Author
Source
International Journal of Oceanography
Issue
Vol. 2011, Issue 2011 (31 Dec. 2011), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-01-23
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Earth Science , Water and Environment
History and Geography
Science
Abstract EN
This study considers environmental factors influencing aggregate fish catch in the South Coast transition of South Africa.
The environmental forcing is studied via (i) seasonal analysis of SeaWifs chlorophyll and related variables, (ii) composite analysis of atmospheric and oceanographic reanalysis data, (iii) statistical analysis of annual FAO fish catch with climatic indices, and (iv) analysis of depth-latitude hydrographic sections over the shelf (33–36S, 22–26E).
In years of higher fish catch there is a northward shift of the subtropical anticyclones and upwelling that is partially related to Pacific El Nino.
Westerly troughs skirt the Agulhas Bank creating onshore Ekman transport.
Higher sea surface height inshore, and cooler sea temperatures and lower salinity offshore induce a gradient that weakens the Agulhas Current.
These environmental conditions favour the southeastward migration of juvenile fish from west to south coast.
A multivariate model of aggregate fish stocks, using four environmental variables: salinity and zonal currents in the Agulhas Current, sea temperature in the Agulhas source region, and geopotential height over the Cape, accounts for 53% of variance at 0-1 year lead.
Freshening of the boundary current is a factor influencing aggregate fish catch in the South Coast transition.
American Psychological Association (APA)
Jury, Mark R.. 2012. Environmental Influences on South African Fish Catch : South Coast Transition. International Journal of Oceanography،Vol. 2011, no. 2011, pp.1-10.
https://search.emarefa.net/detail/BIM-508211
Modern Language Association (MLA)
Jury, Mark R.. Environmental Influences on South African Fish Catch : South Coast Transition. International Journal of Oceanography No. 2011 (2011), pp.1-10.
https://search.emarefa.net/detail/BIM-508211
American Medical Association (AMA)
Jury, Mark R.. Environmental Influences on South African Fish Catch : South Coast Transition. International Journal of Oceanography. 2012. Vol. 2011, no. 2011, pp.1-10.
https://search.emarefa.net/detail/BIM-508211
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-508211