Dataset extent

South Coast Demersal Biomass Survey on the Africana Voyage 095, September 1991

The South Coast Demersal Biomass Survey on the Africana Voyage 095 was conducted on 12 September 1991 to 3 October 1991. The main objective of the survey was to conduct a random stratified bottom trawl survey to assess the biomass, abundance and distribution of hake, sole, horse mackerel, squid and other trawl species with emphasis on 'inshore' fishing areas for recruitment estimates; to investigate the hydrology and current profiles of the South Coast and to relate this to the distribution of the major demersal trawl species; this included five transects extending from specified areas on the South Coast and approximately perpendicular to the coastline out towards the mainstream of the Agulhas Current. A CTD grid in the Cape St Francis area was also done; to do a selected number of midwater trawls to test for the abundance of kingklip and hake and other demersal species as close as possible to the bottom and in midwater over grounds normally inaccessible to bottom trawl gear; to do a selected number of deep trawls >500m with midwater and or bottom gear to investigate the depth distribution of hake and other demersal species on the edge of the Agulhas Bank; to conduct routine biological and length frequency sampling of demersal species; to sample squid intensively to establish their distribution and abundance on the South Coast; to test the feasibility of keeping live sole and other demersal species in temporary holding tanks on board go that they can be used for land-based experimental research; to sample for squid and other fish eggs and larvae using bongo nets. Collection of the following specific material for land-based research: snoek gut contents, belman, kob, echinoderms, squid, rocks, south coast rock lobster, crabs, sharks and rays as well as any other unusual specimens.

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Additional Info

Field Value
Last Updated September 23, 2024, 08:49 (UTC)
Created September 23, 2024, 08:49 (UTC)
Language
affiliation Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), email: gtsglider@gmail.com
contributors Gavin Tutt
downloadURL https://repository.ocean.gov.za/index.php/s/2T5wPLRe46bwb9A
harvest_object_id 04ddd176-0883-4686-b20b-8db359e322da
harvest_source_id c880098e-385a-4d72-80f0-2f1d6603b53b
harvest_source_title MIMS
spatial {"type": "Polygon", "coordinates": [[[20.0, -33.5], [27.5, -33.5], [27.5, -36.0], [20.0, -36.0], [20.0, -33.5]]]}
xmax 27.5
xmin 20.0
ymax -36.0
ymin -33.5