Name: South Coast Demersal Biomass Survey on the Africana Voyage 086, September 1990
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/DEA.MIMS.09122024

Title	South Coast Demersal Biomass Survey on the Africana Voyage 086, September 1990
Authors	David Japp Oceans and Coastal Research, Department of Environment, Forestry and Fisheries (DFFE), South Africa
Publisher	Department of Forestry, Fisheries and the Environment (2024)
Contributors	Project Leader: Tarron Lamont Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), email: tarron.lamont@gmail.com Project Leader: Gavin Tutt Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), email: gtsglider@gmail.com
Abstract	South Coast Demersal Biomass Survey was conducted on the Africana Voyage 086 from 07 September - 02 October 1990. The objectives of the cruise were to survey by means of bottom trawling (under 200 m) the abundance and distribution of adult and juvenile hake, sole, squid, horse mackerel and other demersal target species and to make biomass estimates of each; to study the hydrological environment using the CTD and ADCP and to relate this information to the catches of hake , sole, squid, horse mackerel and other trawl species. The investigation included hydrological transects off the Eastern Cape Coast from inside the bay areas outwards to the shelf -break or main Agulhas stream; a pilot survey using a Calvet net to investigate the feasibility of determining sole egg distribution for the egg production technique; data on the eggs and larvae of other species were also collected. A study was also conducted on demersal community relationships, particularly of chondrichthyians and important trawl caught species; to sample squid to establish their distribution, abundance, biomass and biology prior to the main fishing season (jig fishery); to study the biology of kob; to study the fecundity and batch spawning of sole and hake and finally to conduct routine biological sampling of the main demersal species and to train junior ORA and technical staff.
Data	Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) Cite 10.15493/DEA.MIMS.09122024 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 Sep 1990 – 02 Oct 1990
Geographic extent	North: -34.69 South: -35.69 West: 19.89 East: 20.89
Keywords	Africana, Africana 086, cruise report, sailing orders
Related resources	Digital objects included in this collection: Processed CTD continuous observations from the South Coast Demersal Biomass Survey on the Africana Voyage 086, September 1990 (10.15493/DEA.MIMS.13122024) Processed CTD discrete observations from the South Coast Demersal Biomass Survey on the Africana Voyage 086, September 1990 (10.15493/DEA.MIMS.14122024)

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