Name: Horse Mackerel Hydroacoustic Survey on the Africana Voyage 107, October 1992
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/DEA.MIMS.09112024

Title	Horse Mackerel Hydroacoustic Survey on the Africana Voyage 107, October 1992
Authors	Ian Hampton Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), South Africa
Publisher	Department of Forestry, Fisheries and the Environment (2024)
Contributors	Project Leader: Gavin Tutt Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), email: gtsglider@gmail.com Project Leader: Tarron Lamont Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), email: tarron.lamont@gmail.com
Abstract	The Horse Mackerel Hydroacoustic Survey was conducted on the Africana Voyage 107 from 07-23 October 1992. The objectives of the survey were to obtain a hydroacoustic estimate of horse mackerel abundance in the area between East London and Mossel Bay; to obtain acoustic estimates of anchovy and pilchard abundance east of Mossel Bay to assist in the design of the pelagic spawner biomass survey in November; to obtain a target strength/length relationship for horse mackerel and target strength data for anchovy and pilchard; to collect biological data pertaining to horse mackerel; to investigate the foraging behaviour of horse mackerel and food preference of pilchard; to test for relationships between horse mackerel movement and near-surface and mid-water currents, and to add to the ADCP data base for the southeast coast; to measure thermal salinity structure of the water column and to measure basic biotic parameters (oxygen, nutrient and chlorophyll); to collect data from the satellite imager on the large-scale influence of the Agulhas current; to sample mesopelagic fauna off the shelf with a number of ad hoc deep trawls; and to characterise zooplankton patches acoustically on a number of cross-shelf transects.
Data	Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) Cite 10.15493/DEA.MIMS.09112024 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	07 Oct 1992 – 23 Oct 1992
Geographic extent	North: -33.5 South: -35.5 West: 22.5 East: 27.5
Keywords	Africana, Africana 107, sailing orders
Related resources	Digital objects included in this collection: Processed CTD continuous observations from the Horse Mackerel Hydroacoustic Survey on the Africana Voyage 107, October 1992 (10.15493/DEA.MIMS.10112024) Processed CTD discrete observations from the Horse Mackerel Hydroacoustic Survey on the Africana Voyage 107, October 1992 (10.15493/DEA.MIMS.11112024)

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