Please note that this is a staging site.
168 datasets found Page 4 of 7
DOI: 10.15493/DEA.MIMS.20112022
Integrated Ecosystem Programme: Southern Benguela (IEP:SB) on the Algoa Voyage 277, November 2021

This Integrated Ecosystem Programme: Southern Benguela (IEP:SB) cruise was conducted on the Algoa Voyage 277 in November 2021. This is a long-term monitoring line conducted off the coast of Kleinsee, Namaqualand, Elands/St Helena Bay and Scarborough on the west coast of South Africa. The IEP:SB in 2013 consolidated a long-term, multi-decadal time-series (from 1951 onward) of information for this important region and has continued monitoring in the form of the IEP:SB. The programme is a multi-disciplinary, collaborative and capacity building platform undertaking relevant science, including updating technology, with the aim to develop ecosystem indicators that can be used to effectively monitor and understand the Southern Benguela. These include physical, chemical, planktonic, microbial, seabird, marine mammal, benthic and pollution (plastic) ecosystem indicators as required by ecosystem-based management regarding the following priorities: ocean warming, ocean acidification, trophic...

DOI: 10.15493/DEA.MIMS.01112023
South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line cruise on the Algoa Voyage 275, September 2021

The South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line in the South-East Atlantic Ocean was conducted on the Algoa Voyage 275 from 13 September to 7 October 2021. The cruise operated from Cape Town towards Slangkop and westwards to 0° E, in an easterly direction in the South Atlantic Ocean along the SAMBA Monitoring Line (34.5°S). The objectives of the cruise were to recover, service and deploy 10 CPIES/PIES on the SAMBA transect; attempt to locate and recover DFFE current meter mooring (M7), that could not be recovered during 2020 cruise; undertake full depth Conductivity, Temperature, Depth (CTD) casts along the SAMBA transect (37 stations) using containerised winch system; undertake chlorophyll, oxygen, nutrient and Dissolved Inorganic Carbon (DIC) sampling at CTD stations and underway along SAMBA transect; collect under-way Thermosalinograph (TSG); Surface Photosynthetically Active Radiation (SPAR) and Ship-mounted Acoustic Doppler...

DOI: 10.15493/DEA.MIMS.19112022
Integrated Ecosystem Programme: Southern Benguela (IEP:SB) on the Algoa Voyage 274, August 2021

This Integrated Ecosystem Programme: Southern Benguela (IEP:SB) cruise was conducted on the Algoa Voyage 274 in August 2021. This is a long-term monitoring line conducted off the coast of Kleinsee, Namaqualand, Elands/St Helena Bay and Scarborough on the west coast of South Africa. The IEP:SB in 2013 consolidated a long-term, multi-decadal time-series (from 1951 onward) of information for this important region and has continued monitoring in the form of the IEP:SB. The programme is a multi-disciplinary, collaborative and capacity building platform undertaking relevant science, including updating technology, with the aim to develop ecosystem indicators that can be used to effectively monitor and understand the Southern Benguela. These include physical, chemical, planktonic, microbial, seabird, marine mammal, benthic and pollution (plastic) ecosystem indicators as required by ecosystem-based management regarding the following priorities: ocean warming, ocean acidification, trophic...

DOI: 10.15493/DEA.MIMS.24112022
West Coast Hake Biomass on the Africana Voyage 015, January 1984

The purpose of this cruise was to survey by means of trawling the abundance of recruiting and adult hake between the Orange River and longitude 20° E. The objectives also included investigating the diurnal cycle of hake and other demersal species, to compare the trawling results of R.S. Africana with those of M.F.V. Chicha Touza, the Spanish trawler used for similar surveys, to investigate the environment of hake and other demersal species and to carry out acoustic target identification of mesopelagic species using RMT 8 nets.

DOI: 10.15493/DEA.MIMS.14842023
West Coast Cetacean Distribution and Abundance Survey on the Algoa Voyage 266, November 2019

The West Coast Cetacean Distribution and Abundance Survey was conducted on Algoa Voyage 266, from 04 November to 15 November 2019. The cruise operated along the shelf and slope regions of the West Coast of South Africa, spanning from Dassen Island to Groenriviermond. The primary objective was to assess the distribution and abundance of cetaceans, particularly humpback whales, in the study area. This work adhered to internationally accepted protocols and provided practical experience in addressing logistical and technical challenges associated with dedicated cetacean research cruises.

DOI: 10.15493/DEA.MIMS.16042024
South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line cruise on the Algoa Voyage 265, September 2019

The South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line in the South-East Atlantic Ocean was conducted on the Algoa Voyage 265 from 30 September 2019 to 16 October 2019. The cruise operated from Slangkop, off Cape Town, westwards to 0° E, in the South Atlantic Ocean along the SAMBA transect. The objectives of the cruise were to recover, service and re-deploy six (6) Pressure Inverted Echosounders (PIES); complete 37 Conductivity, Temperature, Depth (CTD) full depth casts (using the containerised winch) along the SAMBA transect; undertake Chlorophyll and Oxygen sampling at CTD stations and underway along SAMBA transect; collect underway Thermosalinograph (TSG); Surface Photosynthetically Active Radiation (SPAR) and Ship-mounted Acoustic Doppler Current Profilers (S-ADCP) data and provide training to newly employed Department of Forestry, Fisheries and the Environment (DFFE) personnel and interns.

DOI: 10.15493/DEA.MIMS.07502023
West Coast Whale Cruise - In-depth sampling of humpback whale feeding super-groups on the Algoa Voyage 254, November 2018

The West Coast Whale Cruise was conducted on the Algoa Voyage 254 between 1 and 14 November 2018. The cruise operated between the shelf, slope and offshore regions (<2000m depth) off the west coast of South Africa, between Cape Point (-34.36.111, 18.38064) and Groenriviermond (-30.8277, 17.52061). This cruise was undertaken for data collection as part of a collaborative project led by the Department of Environmental Affairs (DEA) in collaboration with the Whale Unit, Mammal Research Institute of the University of Pretoria, Department of Agriculture, Forestry and Fisheries (DAFF), National Oceanic and Atmospheric Administration (USA), Aqualie Institute (Brazil) and Oregon State University (USA). The greater programme is titled 'Large whale research - genetic relatedness, stock identification, abundance, feeding and migratory behaviours' and has two components, the east coast and west coast components. This cruise focused on the west coast humpback whales.

DOI: 10.15493/DEA.MIMS.28062025
South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line on the RS Algoa Voyage 237, April 2017

The South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line in the South-East Atlantic Ocean was conducted on the RS Algoa Voyage 237 from 04 April 2017 to 12 April 2017. The cruise operated from Slangkop, off Cape Town, westwards to 15° E, in the South Atlantic Ocean along the SAMBA transect. The objectives of the cruise were to recover, service and re-deploy five (5) Acoustic Doppler Current Profilers (ADCP) moorings (1 x shelf mooring and 4 tall moorings); complete 3 Conductivity, Temperature, Depth (CTD) 1000m depth casts for the calibration of the SeaBird SBE37 sensors deployed on the moorings along the SAMBA transect; collect underway Thermosalinograph (TSG); Surface Photosynthetically Active Radiation (SPAR) and Ship-mounted Acoustic Doppler Current Profilers (S-ADCP) data. Lastly, 4 Argo floats were deployed to enhance the Global Ocean Observing System (GOOS) of Intergovernmental Oceanographic Commission (IOC) in the South Atlantic Ocean...

DOI: 10.15493/dea.mims.26052242
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Cape Canyon Exploration Cruise: Southern Benguela in the South-East Atlantic Ocean on the Algoa Voyage 236, March 2017

This Cape Canyon Exploration Cruise: Southern Benguela in the South-East Atlantic Ocean was conducted on the Algoa Voyage 236 from the 06 to 30 March, 2017. The overall aim of this Cape Canyon exploration project is to initiate multi-discplinary and integrated benthic ecosystem process studies within DEA:OCR, in collaboration with external experts (South African National Biodiversity Institute, South African Environmental Observations Network, Council for GeoScience and Nelson Mandela Metropolitan University). Objectives include the collection of basic physical, chemical, biological and oceanographic data that will enable the understanding of the environment of the canyon and an assessment of the spatial distibution of benthic species.

DOI: 10.15493/dea.mims.26052235
South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line in the South-East Atlantic Ocean on Algoa Voyage 221, November 2015

The South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line in the South-East Atlantic Ocean was conducted on the Algoa Voyage 221, 30 November to 14 December, 2015. SAMBA forms part of the South African component of the International South Atlantic Meridional Overturning Circulation project (SAMOC-SA), which aims to characterise the time-mean and time-varying components of the SAMOC in the South Atlantic Ocean and monitor the variability of the main Southern Ocean frontal systems associated with the Antarctic Circumpolar Current (ACC), south of Africa.

DOI: 10.15493/DEA.MIMS.15072023
South Coast Inshore Demersal Biomass and Horse Mackerel Acoustic Survey on the Africana Voyage 125, September 1994

The South Coast Inshore Demersal Biomass and Horse Mackerel Acoustic Survey was conducted on the Africana 125 from 21 September to 18 October 1994. The primary objective is to conduct a stratified bottom trawl survey to assess the biomass, abundance and distribution of hake, sole, horse mackerel, squid and other trawl species on the Agulhas Bank up to 200m, but biased in terms of number of stations in depths up to 120m.

DOI: 10.15493/DEA.MIMS.15062023
Demersal South Coast Inshore Biomass Survey on the Africana Voyage 122, June 1994

The Demersal South Coast Inshore Biomass Survey was conducted on the Africana 122 from 6 June to 5 July 1994. The primary objective of this cruise was to conduct a stratified bottom trawl survey to assess the biomass, abundance and distribution of hake, sole, horse mackerel, squid and other trawl species on the Agulhas Bank.

DOI: 10.15493/DEA.MIMS.15052023
Anchovy and Pilchard Recruitment Survey on the Africana Voyage 121, May 1994

The Anchovy and Pilchard Recruitment Survey was conducted on the Africana Voyage 121 from 3 to 27 May 1994. The cruise objectives included an estimation of the abundance and size-structure of anchovy and pilchard recruits, a description of distribution and behaviour patterns of anchovy and pilchard recruits and the influence of oceanographic variables on these, the collection of biological data on pelagic fish species and an examination of the distribution and abundance of plankton in relation to the environment and to recruit distribution and condition.

DOI: 10.15493/DEA.MIMS.14912023
West Coast Hake Biomass on the Africana Voyage 118, January 1994

The West Coast Hake Biomass cruise was conducted on the Africana 118 from 4 to 26 January 1994. The objectives of the cruise were to survey by means of bottom trawling the abundance of adult and recruiting hake, and other demersal species on the West Coast of South Africa; to investigate the environmental and ecological interrelationships of hake and other demersal species; to study the biology of chondrichthyan species; to investigate the maturity and feeding biology of horse mackerel; to obtain information on the hydrology and currents on the West Coast; to locate and attempt recovery of the offshore current meter/sediment trap array deployed 686m off Hondeklip Bay; to sample catches for hake sex ratios and frequency of gill parasites; to investigate the occurrence, distribution, reproduction and abundance of squid; to investigate the distribution and biology of demersal species in water at depths of greater than 500m by means of demersal trawl and to study the parasites of small...

DOI: 10.15493/DEA.MIMS.14902023
Pelagic Fish Spawner Biomass Survey on the Africana Voyage 117, November 1993

The Pelagic Fish Spawner Biomass Survey was conducted on the Africana 117 from 9 November to 4 December 1993. The objectives included an estimation of the biomass and population length structure of anchovy, pilchard, round herring and horse mackerel off South Africa by means of echo-integration and midwater trawling; determining the age-composition of the anchovy population; estimating of anchovy biomass by means of the egg production method and a trial estimation of pilchard biomass by means of the egg production method.

DOI: 10.15493/DEA.MIMS.14892023
South Coast Inshore Demersal Biomass and Horse Mackerel Acoustic Survey on the Africana Voyage 116, September 1993

The South Coast Inshore Demersal Biomass and Horse Mackerel Acoustic Survey was conducted on the Africana Voyage 116 from 1 to 30 September 1993. The primary objective of the cruise was to conduct a stratified bottom trawl survey to assess the biomass, abundance and distribution of hake, sole, horse mackerel, squid and other trawl species on the Agulhas Bank up to 200m, but biased in terms of number of stations in depths up to 120m.

DOI: 10.15493/DEA.MIMS.14882023
Student training and acoustic trials on the Africana Voyage 115, July 1993

The student training and acoustic trials cruise was conducted on the Africana Voyage 115 from 13 to 16 July 1993. The objectives of the cruise were training the third year / honours students and pupil technicians, conducting pollution sampling in Table Bay and development of acoustic software.

DOI: 10.15493/dea.mims.26052212
Pelagic Biomass Survey on the Africana Voyage 290, October 2016

The principal aim of the Pelagic Biomass Surveys is to obtain estimates of the total biomass of anchovy, sardine and west coast round herring and to obtain data on their population length frequency compositions, for input to the operational management procedure (OMP) for making Total Allowable Catch (TAC) recommendations for the following year. The surveys also obtain information on the environment and food regime impacting anchovy, sardine and west coast round herring around the coast, although recent surveys (~2009 onwards) have included much less environmental sampling than earlier years. The survey uses hydro-acoustics to estimate fish density and abundance, and midwater trawling to identify acoustic targets and to obtain length frequency and other biological data, and ichthyoplankton and environmental sampling are also conducted. The abundance and biomass estimates from these surveys are an essential input into the management process and serve as a scientific basis for the...

DOI: 10.15493/dea.mims.26052213
Sardine, Hake, and Anchovy Recruitment Programme (SHARP) / St. Helena Bay Monitoring Line (SHBML) on the Africana Voyage 280, February 2012

At the intiation of the original SARP project the operational objective was to investigate variability in the transport of clupeoid eggs and larvae by the Benguela jet current from the south coast spawning grounds to the west coast nursery area as this would impact recruitment, thereby influencing the abundance of pelagic resources. To date 17 years worth of data have been collected on a transect perpendicular to the coast off Slangkop, the SARP line. Many valuable conclusions have been drawn using the information. Though the SARP line has contributed to its initial goal, the wealth of data and knowledge accumulated over the years suggests it is time for a revamp and extension of the SARP line. The idea is to strengthen the sampling strategy to include a more comprehensive experimental design that not only targets clupeoid eggs and larvae but also the early life stages of another highly valuable fisheries-targeted resource, the Cape hakes (Marluccius capensis and M. Paradoxus), and...

DOI: 10.15493/DEA.MIMS.42112024
Current Meter and Sediment Trap Recovery Shelf Chemistry on the Africana Voyage 114, June 1993

The Current Meter and Sediment Trap Recovery Shelf Chemistry on the Africana Voyage 114, June 1993 was conducted from 21 June 1993 to June 30 1993. The main objectives of the cruise were to recover and redeploy the inshore time series current meter array deployed in 168m off Cape Columbine. To locate and attempt recovery of the inshore current meter deployed in 132m off Hondeklip Bay; to locate and attempt recovery of the offshore current meter sediment trap array deployed in 686m off Hondeklip Bay; to attempt location and recovery of the offshore current meter array deployed in 278m off Cape Columbine. To conduct research into the shelf geochemistry on a line off Hondeklip Bay and, if time, in St Helena Bay and to conduct a survey of nearshore dissolved oxygen in the vicinity of Port Nolloth to link in with research on Namagualand stocks being undertaken by the Rock Lobster section.

DOI: 10.15493/DEA.MIMS.41112024
Anchovy Recruitment Survey on the Africana Voyage 112, May 1993

The Anchovy Recruitment Survey on the Africana Voyage 112 was conducted from 18 May 1993 to June 05 1993. The main objectives of the cruise were to estimate the abundance and size-structure of anchovy and pilchard recruits; to describe the distribution and anchovy and pilchard recruits and the influence of oceanographic variables on these. To collect biological data on pelagic fish species and to examine the distribution, abundance and production of plankton in relation to the environment and to recruit distribution and condition.

DOI: 10.15493/DEA.MIMS.40112024
South Coast Demersal Biomass Survey on the Africana Voyage 111, April 1993

The South Coast Biomass Survey on the Africana Voyage 111 was conducted from 15 April 1993 to May 12 1993. The main objectives of the cruise were to conduct a stratified bottom trawl survey to assess the biomass, abundance and distribution of hake, sole, horse mackerel, squid and other trawl species on the Agulhas Bank; 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 points approximately perpendicular to the coastline out towards the shelf edge; a 'mini' CTD ransèct grid in the Cape St Francis area was also completed. To estimate the sex ratios of both hake species and the frequency of gill parasites; to do a selected number of deep bottom trawls (mid-water optional), to investigate the distribution and abundance of deep-water fauna. To conduct routine biological and length frequency sampling of demersal fish species and to sample...

DOI: 10.15493/DEA.MIMS.06112024
South Coast Demersal Inshore Biomass Survey on the Africana Voyage 106, September 1992

The South Coast Demersal Inshore Biomass Survey was conducted on the Africana Voyage 106 from 02 to 23 September 1992. The objectives of the survey were to conduct a 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 pf the major demersal trawl species. This included five transects extending from specified areas in the South Coast and approximately perpendicular to the coastline out towards the main stream of the Agulhas Current. A 'mini' CTD transect grid in the Cape St Francis area was also done; to do a selected number of midwater trawls to investigate the distribution and abundance of deep-water fauna; to conduct routine biological and length frequency sampling of demersal species; to sample squid intensively to...

DOI: 10.15493/DEA.MIMS.03112024
Benguela Current Sources and Transport (BEST 1) on the Africana Voyage 105, June 1992

The Benguela Current Sources and Transport (BEST 1) was conducted on the Africana Voyage 105 from 16 June 1992 to 05 July 1992. The objectives of the survey was the quantification of the flux and Agulhas rings penetrating the South-East Atlantic and the influence of these on the shelf waters and resources of the Benguela system; the provision of a large-scale environmental time-series lasting for a continuous period of 18 months. This was used to validate processes inferred from satellite imagery, thereby enhancing utility of the latter for fisheries environmental monitoring as needed for fisheries research; determination of the distribution and abundance of rock lobster larvae in the South-East Atlantic, to supplement the existing data which were collected in April 1989. This formed an integral part of the Institute's rock lobster research (West Coast rock lobster spend at least one year traversing the South Atlantic gyre before settling on the West Coast); water column and...

DOI: 10.15493/DEA.MIMS.11122024
Anchovy Recruitment Survey on the Africana Voyage 103, May 1992

The Anchovy Recruitment Survey was conducted on the Africana Voyage 103 from 12 - 28 May 1992. The main objectives of the cruise were to estimate the abundance and size-structure of anchovy and pilchard recruits; to describe the distribution and behaviour patterns of anchovy and pilchard recruits and the influence of oceanographic variables on these; to collect biological data on pelagic fish species and to examine the distribution, abundance and production of plankton in relation to the environment and to recruit distribution and condition.

168 datasets found Page 4 of 7

Geographic extent

Temporal extent