| Title | West Coast Demersal Biomass Survey on the Africana Voyage 139, January 1997 |
|---|---|
| Authors |
Augustyn, Johann Tilney, R |
| Publisher | Department of Forestry, Fisheries and the Environment (2026) |
| Contributors |
Contact Person: Tutt, Gavin Project Leader: Lamont, Tarron |
| Abstract | The West Coast Demersal Biomass Survey was conducted on the Africana Voyage 139 from 8 January to 30 January 1997. The objectives of the cruise were to survey, by means of trawling, the abundance of adult and recruiting hake in South African waters; to conduct routine biological and length frequency sampling of demersal species; to investigate the environmental and ecological inter-relationships of hake and other demersal species; to investigate the occurrence, distribution, reproduction and abundance of squid species; to investigate the distribution and biology of demersal species in water at depths greater than 500 m by means of demersal trawling; to sample catches of hake for sex ratios and frequency of gill parasites; to conduct demersal environmental studies including intercalibration of bottom temperature measurements with commercial trawlers, and CTD and ADCP measurements at all trawl stations and other specified stations; the collection of specimens for the South African Museum; to intercalibrate the trawling gear performance of FRS Africana and Dr Fridtjof Nansen by means of joint trawling in order to enable the comparisons of biomass estimates by the two vessels and the estimation of the total hake biomass for the region; and the training of Oceanographic Research Assistants and SANCOR students. |
| Data | |
| Temporal extent | 08 Jan 1997 – 30 Jan 1997 |
| Geographic extent |
Benguela Current Large Marine Ecosystem
North: -28.5 |
| Keywords | Africana , OCEANS , SOUTH ATLANTIC OCEAN , West Coast Demersal Biomass Survey |
| Related resources |
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