Oceanographic conditions during three ichthyoplankton surveys of the Agulhas Current in 1990/91
Beckley, L.E. and Van Ballegooyen, R.C. (1992) Oceanographic conditions during three ichthyoplankton surveys of the Agulhas Current in 1990/91. South African Journal of Marine Science, 12 (1). pp. 83-93.
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Oceanographic conditions measured during three 1990/91 ichthyoplankton surveys along the east coast of South Africa, between Algoa Bay and Tugela, are presented. Offshore of the shelf-break the south-flowing Agulhas Current was the dominant feature, strongly influencing oceanographic conditions on the shelf, with intrusions of Agulhas Current surface water extending shorewards during all three cruises. Inshore there was a strong subsurface temperature front which maintained a fixed location in the vicinity of Mbashe. Central Water upwelled onto the shelf south of Mbashe and there was a strong seasonal thermocline at stations over the southern shelf. Ichthyoplankton concentrations ranged from 0,005 to 4,576 larvae·m−3. Concentrations generally decreased offshore, the mean concentration in the Agulhas Current being about half of that recorded inshore. Completion of identifications of fish larvae will enable larval assemblages to be correlated with oceanographic conditions prevalent during the three cruises.
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|Publisher:||Sea Fisheries Research Institute|
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