| Title | Processed CTD discrete observations from the Anchovy Recruitment on the Africana Voyage 047, August 1986 |
|---|---|
| Project | Anchovy Recruitment Survey |
| Authors |
Mbulelo Makhetha Gavin Tutt Tarron Lamont |
| Publisher | Department of Forestry, Fisheries and the Environment (2023) |
| Contributors |
Contact Person: Mbulelo Makhetha Contact Person: Gavin Tutt Contact Person: Tarron Lamont |
| Abstract | Here we present processed Conductivity-Temperature-Depth (CTD) discrete data from the upcast collected between 04 August and 29 August 1986, during the Pelagic Winter Survey on the Africana Voyage 047, in the southern part of the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of South Africa and in the Agulhas Current Large Marine Ecosystem (ACLME) on the south coast of South Africa. Neil Brown MK3 and MK4 CTD instruments were used to measure pressure, temperature and conductivity through the water column during research and monitoring cruises between 1983 and 2000. The main objectives of the cruise were a direct assessment of the biomass of adult anchovy and pilchard on the South and East coasts by acoustic survey, supplemented by aerial fish spotting (East Coast only); an acoustic investigation of the distribution and behaviour of other pelagic fish of commercial importance; an investigation of the relationship between anchovy, pilchard and the hydrobiological environment, specifically water temperature and plankton distribution; a determination of the extent to which anchovy recruits penetrated onto the South Coast, as follow-up to recruit surveys on the West Coast in May and June (Voyages 44 and 45) and a study of the broad physical and chemical features of the Agulhas Bank and East Coast continental shelf in winter. |
| Methods | Neil Brown MK3 and MK4 Conductivity-Temperature-Depth (CTD) instruments were used to measure pressure, temperature and conductivity through the water column during research and monitoring cruises between 1983 and 2000. Temperature was converted from the IPTS-68 scale to the ITS-90 scale, and salinity was computed from conductivity measurements on the 1978 Practical Salinity Scale, according to UNESCO (1991) algorithms. UNESCO (1993) quality control procedures were applied to the data, and obvious erroneous values resulting from problems including electronic spikes, data collection in air, inadequate flow through the conductivity cell, among others, have been removed. Any additional calibrations or corrections have been specified in each data file, where applicable and available. |
| Data | |
| Temporal extent | 05 Aug 1986 – 23 Aug 1986 |
| Geographic extent |
Benguela Current Large Marine Ecosystem (BCLME), Agulhas Current Large Marine Ecosystem (ACLME)
North: -28.5 |
| Vertical extent |
Max: -613.0 m Min: -0.01 m |
| Keywords | Africana, Africana 047, Conductivity, CTD, Depth, INDIAN OCEAN, Neil Brown CTD, SOUTH ATLANTIC OCEAN, Temperature |
| Related resources |
|