Name: Pelagic Biomass Survey on the Africana Voyage 108, November 1992
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/DEA.MIMS.12112024

Title	Pelagic Biomass Survey on the Africana Voyage 108, November 1992
Authors	J Hewitson 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 Pelagic Spawner Biomass Survey was conducted on the Africana Voyage 108 from 05 November to 02 December 1992. The objectives of the survey were to get an estimation of the biomass and population length structure of anchovy, pilchard and round herring off South Africa by means of echo-integration and midwater trawling; estimation of anchovy biomass by means of the egg production method, and trial estimation of pilchard biomass by means of the egg production method; description of distribution and behaviour patterns of commercially harvested epi-pelagic and meso-pelagic fish, and the influence of oceanographic variables on these; collection of biological data on reproduction, condition and diet of pelagic fish species; to determine phytoplankton biomass in the nanophytoplankton (<10 µm) and netphytoplankton (>10 µm) size-classes in surface waters; to obtain information on the distribution and abundance of meso-zooplankton; and lastly to estimate secondary production rates of adult copepods using the egg production method. If time permitted, experiments were to be set up to determine growth rates of the juvenile stages of the dominant copepod species (Calanus and Calanoides).
Data	Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) Cite 10.15493/DEA.MIMS.12112024 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	05 Nov 1992 – 02 Dec 1992
Geographic extent	North: -30.0 South: -37.0 West: 14.0 East: 26.5
Keywords	Africana, Africana 108, cruise report, sailing orders
Related resources	Digital objects included in this collection: Processed CTD continuous observations from the Pelagic Biomass Survey on the Africana Voyage 108, November 1992 (10.15493/DEA.MIMS.13112024) Processed CTD discrete observations from the Pelagic Biomass Survey on the Africana Voyage 108, November 1992 (10.15493/DEA.MIMS.14112024)

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