Name: Processed CTD continuous observations from the West Coast Hake Biomass Survey on the Africana Voyage 054, June 1987
License: https://creativecommons.org/licenses/by-sa/4.0/legalcode

DOI: 10.15493/DEA.MIMS.05072023

Title	Processed CTD continuous observations from the West Coast Hake Biomass Survey on the Africana Voyage 054, June 1987
Project	West Coast Hake Biomass
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 Contact Person: Tarron Lamont Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientist; contact details: email: tarron.lamont@gmail.com
Abstract	Here we present processed downcast Conductivity-Temperature-Depth (CTD) continuous data collected between 16 June and 10 July 1987, during the West Coast Hake Biomass Cruise on the Africana Voyage 054, 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 scientific targets of the trip revolved around the determination of biomass index of both Cape hake species off the South African west coast. The diurnal cycle of Cape hake and their relationship with environmental parameters was also studied. Some hake material were collected in South West African waters. Deep-water trawls were made to delimit the offshore extent of hake distribution and to collect rare specimens of fish for accession to museums. Demersal community interrelationships were studied, as were spatial distribution patterns and spawning fractions of round herring.
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) Cite 10.15493/DEA.MIMS.05072023 Style Terms of use These data are made available with the express understanding that any such use will properly acknowledge the originator(s) and publisher and cite the accession numbers and/or associated Digital Object Identifiers. Anyone wishing to use these data should properly cite and attribute the data providers listed as authors in the metadata provided with each dataset. It is expected that all the conditions of the data license will be strictly honoured. Use of any material herein should be properly cited using the dataset’s persistent identifiers such as accession numbers and DOIs. I agree to the terms of use
Temporal extent	16 Jun 1987 – 10 Jul 1987
Geographic extent	Benguela Current Large Marine Ecosystem (BLMCE) North: -29.0 South: -36.5 West: 14.0 East: 20.5
Vertical extent	Max: -476.7 m Min: -1.0 m
Keywords	Africana, Africana 054, 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 continuous observations from the West Coast Hake Biomass Survey on the Africana Voyage 054, June 1987 (10.15493/DEA.MIMS.05112023) This digital object is part of West Coast Hake Biomass Survey on the Africana Voyage 054, June 1987 (10.15493/DEA.MIMS.01922023)

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