Please note that this is a staging site.

Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) (140) ✕

140 datasets found Page 5 of 6
DOI: 10.15493/DEA.MIMS.11842023
Anchovy Recruitment Survey on the Africana Voyage 073, June 1989

The Anchovy Recruitment Survey was conducted on the Africana Voyage 073 from 8 - 22 June 1989. The survey objectives were to assess anchovy recruitment strength in South African waters in order to recommend a final quota for the 1989 RSA anchovy fishing season; to collect data for the determination of the target strength of anchovy and other pelagic and mesopelagic species; to collect data on shoaling behaviour of pelagic fish, specifically anchovy, pilchard and red-eye; to investigate relationships between the distribution of pelagic fish, zooplankton and water temperature; to determine standing stocks of phytoplankton and zooplankton in different regions and to estimate copepod secondary production in these regions through egg-production and moulting rate experiments.

DOI: 10.15493/DEA.MIMS.01112024
South Coast Demersal Biomass Survey on the Africana Voyage 072, May 1989

The South Coast Demersal Hake Biomass Survey was conducted on the Africana Voyage 072 from 10 May to 29 May 1989. The objectives of the cruise were to survey by means of bottom-trawling the abundance of adult and recruiting hake, sole and other trawl target species; to make experimental bottom-trawls in deep water to collect deep-water specimens of fish and squid; to test the feasibility of an acoustic assessment of horse mackerel; to investigate the environment and ecological interrelationships of hake and other demersal species in the various depth strata; to study demersal community relationships; to investigate the occurrence, distribution and abundance of squid and squid larvae; to investigate the occurrence of line fish species in shallow waters; to study the biology of sharks and skates; and to train Oceanographic Research Assistants.

DOI: 10.15493/dea.mims.26052259
South African National Antarctic Expedition (SANAE) on the SA Agulhas II Voyage 014, December 2014

The South African National Antarctic Expedition (SANAE) is an annual cruise undertaken by the Department of Environmental Affairs (DEA) to change the overwintering teams in Antarctica and to replenish the supplies at the SANAE IV Research base. This voyage was to deliver the SANAE 54 team to the island and return with the SANAE 53 team. The cruise was undertaken between 14 December 2014 and 19 February 2015 with full scientific complement.

DOI: 10.15493/DEA.MIMS.11822023
Physical-Chemical Oceanography Cruise on the Africana Voyage 070, March 1989

The Physical-Chemical Oceanography Cruise was conducted on the Africana Voyage 070 from 2 - 11 March 1989. The objectives of the cruise were to retrieve six acoustic current meters deployed in September 1988; to recover and redeploy the sequentially sampling sediment trap and the two Anderaa current meters incorporated on the array at a position 90 miles west of Walvis Bay; to repeat a line of Conductivity-Temperature-Depth (CTD) stations running at right angles to the shelf from the 4000m Cape Basin station towards Conception Bay; to take size-fractional chlorophyll samples at 3-hourly intervals to calibrate the in-line fluorometer in the hydro lab; to collect a Pygmy Right Whale for Peter Best and rare sharks for Len Compagno from Walvis Bay and to exchange scientific equipment at Walvis Bay for the SWA (Namibia) section.

DOI: 10.15493/DEA.MIMS.11812023
West Coast Hake Biomass Survey on the Africana 069, January 1989

The West Coast Hake Biomass Survey was conducted on the Africana 069 from 5 - 26 January 1989. The cruise was multi-disciplinary. The main target was to determine, by means of the swept area method, the present status of the hake resource on the South African west coast. In carrying out this study, it was possible also to collect some information on the environment and zooplankton (including squid larvae) in the vicinity of the catches and to determine some ecological interrelationships of hake and other demersal fish species, to investigate squid distribution, to study some aspects of the biology and distribution of sharks and skates, to study the feeding ecology of demersal species of little commercial importance and to look closely at demersal communities. A diurnal study was also carried out successfully and some deep-water trawls were made to collect rare and interesting specimens. While in South West African waters, a comparison of the trawling capabilities of the M.F.V....

DOI: 10.15493/DEA.MIMS.11802023
Physical-Chemical Oceanography Cruise on the Africana Voyage 067, September 1988

The Physical-Chemical Oceanography Cruise was conducted on the Africana Voyage 067 from 14 - 30 September 1988. This cruise was divided into two legs with the first leg focusing on physical oceanography and the latter on chemical oceanography. The purpose of the first leg of the cruise was primarily to moor current meters and water-level recorders at various sites, mostly north of the Orange River, and to obtain a precise set of Conductivity-Temperature-Depth (CTD) data on a line running normal to the topography from a point in 4200m of water into Conception Bay. The CTD data will be used to calculate water flux along the shelf using inverse techniques. The objectives of the second leg included deploying the Kriel sequential sediment trap west of Walvis Bay, recovering Sea Fisheries Research Institute (SFRI) sediment traps deployed in the first half of the cruise, investigating trends in primary production in the vicinity of the Kriel trap mooring and around upwelling centres using...

DOI: 10.15493/DEA.MIMS.03572023
West Coast Hake Biomass Survey on the Africana Voyage 059, February 1988

The main objective of the cruise was to survey by means of trawling the abundance of adult and recruiting hake in South African waters; to investigate the diurnal cycle of hake and other demersal species; to make some experimental trawls in deep water to collect deep-water specimens of fish and squid; to collect routine biological material on demersal species from South West African waters; to investigate the occurence, distribution and abundance of squid and squid larvae; to study demersal community interrelationships and to study the biology of sharks and skates. Oceanographic research assistants were also trained.

DOI: 10.15493/DEA.MIMS.11832023
South-east Atlantic Expedition on the Africana Voyage 071, April 1989

The South-east Atlantic Expedition was conducted on the Africana Voyage 071 from 4 April - 2 May 1989. The South-east Atlantic Expedition had as its main objectives the investigation of the distribution and abundance of phyllosoma larvae of Jasus in the Cape Basin, a comparative study of larval recruitment of Jasus tristani and Jasus lalandii, and the investigation of the circulation in, and ventilation of, the south western Cape Basin. The work was aimed at improving the understanding of the dynamics, in particular recruitment, of rock lobsters in the South-east Atlantic, and at furthering knowledge about some key large scale physical processes which are thought to be important in regulating the distribution and abundance of a number of exploited stocks in the Benguela region.

DOI: 10.15493/DEA.MIMS.01942023
South Coast Hake Biomass Survey on the Africana Voyage 056, September 1987

The objectives of the cruise were to survey by means of trawling the abundance of adult and recruiting hake, sole and other trawl target species; to investigate the environment and ecological interrelationships of hake and other demersal species in the various depth strata; to investigate the occurence, distribution and abundance of squid and squid larvae; to investigate the occurence of linefish species in shallow waters; to identify every species caught in the trawl net; and to do chondrichthyian research. Oceanographic research assistants were also trained.

DOI: 10.15493/DEA.MIMS.01922023
West Coast Hake Biomass Survey on the Africana Voyage 054, June 1987

The scientific targets of the trip revolved around the determination of biomass index of both Cape hake species off the South African west coast. The diurnal cycle of Cape hake and their relationship with environmental parameters was also studied. Some hake material were collected in South West African waters. Deep-water trawls were made to delimit the offshore extent of hake distribution and to collect rare specimens of fish for accession to museums. Demersal community interrelationships were studied, as were spatial distribution patterns and spawning fractions of round herring.

DOI: 10.15493/DEA.MIMS.01902023
West Coast Hake Biomass Survey on the Africana Voyage 050, January 1987

The objectives of the cruise were to survey by means of trawling the abundance of adult and recruiting hake; to investigate the the diurnal cycle of hake and other demersal species; to investigate the environment and interrelationships of hake and other demersal species; to establish the offshore limit of hake and monkfish distribution and to collect deep-water specimens of fish and cephalopods; to conduct mouth-opening experiments with transducers on each wing of the net, and to compare the mouth opening and fishing capabilities of V doors and Polyvalent doors; to study community interrelationships and assemblages and to collect data on hake and other species from the International Commission for the South-East Atlantic Fisheries (ICSEAF) Division 1.5, ie: north of the South African border.

DOI: 10.15493/DEA.MIMS.33122022
West Coast Hake Biomass on the Africana Voyage 039, January 1986

The objectives of this cruise were to survey by means of trawling the abundance of adult and recruiting hake; to investigate the diurnal cycle of hake and other demersal species; to investigate the environment and ecological interrelationships of hake and other demersal species; to carry out acoustic target identification of mesopelagic species with RMT 8 nets; to make a few experimental trawls in deep water to search for the other species of monkfish and to determine the offshore limit of hake distribution; if possible to rendezvous with Spanish and Soviet vessels and to carry out standardisation trawls in parallel and to conduct net mouth-opening experiments with transducers on each wing of the net.

DOI: 10.15493/DEA.MIMS.32122022
Anchovy Spawning Stock Survey on the Africana Voyage 038, November 1985

The objectives of this cruise were to assess the size of the anchovy spawning stock in Cape waters by acoustic survey and estimation of egg production; describe the distribution and behaviour of other pelagic and mesopelagic fish of commercial importance; describe anchovy spawning patterns and estimate the precision of the parameters used in assessing spawning stock size by the egg production method (sex ratio, spawning fraction, fecundity, mean weight); and to investigate relationships between the distribution of pelagic fish, eggs and water temperature.

DOI: 10.15493/DEA.MIMS.31122022
South Coast Hake Biomass on the Africana Voyage 036, October 1985

The first objective of this cruise was to establish, by means of surveying and trawling between 200m and 500m water depths, the feasibility of extending the hake biomass surveys to the South Coast. The area 20 E to 25 E, from 75m to 200m water depths, has already been covered during biomass surveys by Japanese research vessels, accompanied on each occasion by one of the Institute's scientists. The feasibility of trawling shallower than 200m in this region, albeit with heavy gear, has thus already been established. The second objective was to investigate, by trawling, the depth distribution of squid in the area 23 30'E and 24 30'E, from as close as possible to the coast (i.e. as shallow as possible) to a depth of 500m.

DOI: 10.15493/DEA.MIMS.30122022
Spanish-Namibian Environmental Cruise (SNEC) on the Africana Voyage 035, September 1985

The objective of this cruise was to investigate the hydrology and plankton of the coastal waters off Nambia between 20 S and 26 S.

DOI: 10.15493/DEA.MIMS.29122022
West Coast Hake Biomass on the Africana Voyage 033, July 1985

The objectives of this cruise were to survey by means of trawling the abundance of adult and recruiting hake; to investigate the diurnal cycle of hake and other demersal species; to investigate the environment and ecological interrelationships of hake and other demersal species and to carry out acoustic target identification of mesopelagic species with RMT 8 nets.

DOI: 10.15493/DEA.MIMS.28122022
West Coast Hake Biomass on the Africana Voyage 028, January 1985

The objectives of this cruise were to survey by means of trawling the abundance of adult and recruiting hake; to investigate the diurnal cycle and the environment of hake and other demersal species; to compare trawling results of R.S. Africana with those of the Chicha Touza, the Spanish trawler used for similar surveys; to carry out acoustic target identification of mesopelagic species using RMT 8 nets and to retrieve two current meter arrays deployed during Voyage 025.

DOI: 10.15493/DEA.MIMS.26122022
West Coast Physical Oceanography on the Africana Voyage 025, October 1984

The objectives of this cruise included studying shelf circulation in the vicinity of Port Nolloth by placing three current meter moorings across the shelf; exploring the deep circulation in the Cape Basin which is thought to be a driving mechanism for the preponderance of southward flow observed on the shelf by placing a current meter in 3000m of water; recovering one current meter in the Cape Canyon and deploying two current meter moorings and a thermistor string near Cape Columbine and obtaining Conductivity-Temperature-Depth (CTD) data at these sites; collecting chemical samples and CTD data along a line between Port Nolloth to the deep current meter site, this included 100ml samples for analysis by M.J. Orren on routine CTD casts; a line of six coastal CTD stations was to be worked in the Hondeklipbaai upwelling tongue; the surface flow over the 1000m contour was to be studied using an acoustic drifter and samples were to be taken at various CTD stations for nitrogen cycling studies.

DOI: 10.15493/DEA.MIMS.25122022
West Coast Hake Biomass on the Africana Voyage 022, July 1984

The objectives of this cruise were to survey by means of trawling the abundance of adult and recruiting hake; to investigate the diurnal cycle and the environment of hake and other demersal species; to carry out acoustic target identification of mesopelagic species using RMT-8 nets and to study the community interactions of fish species in the area.

DOI: 10.15493/DEA.MIMS.04122022
West Coast Physical Oceanography on the Africana Voyage 019, May 1984

Africana Cruise 019 lasted from May 7 to May 17th 1984 and undertook several scientific tasks. The first part of the cruise was mostly devoted to bathymetric and geophysical (continuous reflection seismic) surveys in the region of the Cape Canyon of SW Cape. These surveys were the responsibility of personnel from the Marine Geoscience Unit of the University of Cape Town, and were done as part of a collaborative project with officers of the Sea Fisheries Research Institute who have an interest in the physiography of the Canyon and adjacent areas. The project received nominal financial support during 1984 from the SANCOR CSP Marine Sedimentology Programme.

DOI: 10.15493/DEA.MIMS.01122022
West Coast Physical Oceanography on the Africana Voyage 016, February 1984

The objectives of this cruise were to conduct torsional vibration trials to meet the requirements of Lloyds, to retrieve and deploy two thermistor chain/current meter moorings and to conduct Conductivity-Temperature-Depth (CTD) profiling in the area of operations.

DOI: 10.15493/dea.mims.20210217
Physical Oceanography Cruise on the Africana Voyage 014, December 1983

The Physical Oceanography Cruise was on the Africana Voyage 014 between the 5th and 15th of December 1983. Research was conducted from Cape Point to Chamais Bay along the south-west coast of South Africa. This cruise was aimed primarily at current profiling along the west coast.

DOI: 10.15493/dea.mims.26052254
Winter Shakedown Cruise on SA Agulhas II Voyage 003, July 2012

The Winter Shakedown Cruise was conducted on the SA Agulhas II, Voyage 003, 9 July to 6 August, 2012. The cruise started in Cape Town and went down to the GoodHope Line then up to the Prince Edward Islands, on to Port Elizabeth and then back to Cape Town. After the arrival of SA Agulhas II back to South Africa, an inaugural Southern Ocean cruise was undertaken, which included a multidisciplinary program to measure oceanographic and biological parameters that characterise the state of the Southern Ocean in the region of interest to South Africa, along with the ecosystem properties of the major gyres, frontal systems and shelf and plateau areas. Additionally, land-based research on marine mammals and seabirds was undertaken at South Africa’s Prince Edward Islands (PEIs). The aim of the cruise was to test the research vessels capability and its equipment and to increase our understanding with regard to the influences of oceanographic conditions (specifically eddies) and topography on...

DOI: 10.15493/dea.mims.20210313
Anchovy Assessment Survey on the Africana Voyage 013, November 1983

The Anchovy Assessment Survey was held on the Africana Voyage 013, between the 1st and 29th November 1983. Research was split up into three legs, Leg 1: Cape Town to Port Elizabeth, Leg 2: Port Elizabeth to East London and Leg 3: Olifants River to Cape Agulhas.

DOI: 10.15493/dea.mims.20210308
Phyllosoma Larva and Oceanographic Survey on the Africana Voyage 011, August 1983

The Phyllosoma Larva and Oceanographic Survey was held on the Africana Voyage 011 between the 12th and 24th August 1983. Research was conducted off the west coast of South Africa in order to study the ocean currents in the offshore area and its influence on West Coast rock lobster distribution.

140 datasets found Page 5 of 6

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Temporal extent