Title Processed CTD discrete observations from the Anchovy Recruitment Survey on the Africana Voyage 073, June 1989
Project Anchovy Recruitment Survey
Authors

Gavin Tutt
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: Gtutt@environment.gov.za

Tarron Lamont
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientist; contact details: email: tlamont@environment.gov.za

Publisher Department of Forestry, Fisheries and the Environment (2023)
Contributors

Contact Person: Gavin Tutt
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: gtsglider@gmail.com

Abstract Here we present processed Conductivity-Temperature-Depth (CTD) discrete data from the upcast collected between 08 and 22 June 1989 during Voyage 073 on the FRS Africana, in the Benguela Current Large Marine Ecosystem (BCLME) region on the west 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 objectives of the Anchovy Recruitment Survey were to assess anchovy recruitment strength in South African waters in order to recommend a final quota for the 1989 RSA anchovy fishing season; to collect data for the determination of the target strength of anchovy and other pelagic and mesopelagic species; to collect data on shoaling behaviour of pelagic fish, specifically anchovy, pilchard and red-eye; to investigate relationships between the distribution of pelagic fish, zooplankton and water temperature; to determine standing stocks of phytoplankton and zooplankton in different regions and to estimate copepod secondary production in these regions through egg-production and moulting rate experiments.
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
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Temporal extent 09 Jun 1989 – 21 Jun 1989
Geographic extent

Benguela Current Large Marine Ecosystem (BCLME)

North: -26.5
South: -35.5
West: 14.5
East: 20.0

Vertical extent Max: -200.5 m
Min: -1.1 m
Keywords Africana, Africana 073, Conductivity, CTD, Depth, Neil Brown CTD, SOUTH ATLANTIC OCEAN, Temperature
Related resources
  • This digital object is described by https://unesdoc.unesco.org/ark:/48223/pf0000090489
  • This digital object is described by https://unesdoc.unesco.org/ark:/48223/pf0000138825
  • This digital object is new version of Raw CTD discrete observations from the Anchovy Recruitment Survey on the Africana Voyage 073, June 1989 (10.15493/DEA.MIMS.11642023)
  • This digital object is part of Anchovy Recruitment Survey on the Africana Voyage 073, June 1989 (10.15493/DEA.MIMS.11842023)