MIMS Catalogue

Select All

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.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.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.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.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.57072024

South Coast Demersal Biomass Survey on the Africana Voyage 102, April 1992

The South Coast Demersal Biomass Survey was conducted on the Africana Voyage 102 from 31 March to 21 April 1992. The objectives of the cruise were 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; 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 outwards toward the main stream of the Agulhas Current; to survey acoustically the major squid spawning grounds to determine the extent of aggregation of squid shoals at the time of the year; to do a selected number of mid-water 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...

DOI: 10.15493/DEA.MIMS.54072024

Pelagic Pre-Recruit Mesopelagic Biomass Survey on the Africana Voyage 101, March 1992

The Pelagic Pre-Recruit Mesopelagic Biomass Survey was conducted on the Africana Voyage 101 from 11-23 March 1992. The objectives of the cruise were to get an estimation of the biomass and population structure of pelagic pre-recruit fish off the West Coast by means of echo-integration and midwater trawling; to get an estimation of a pelagic pre-recruit biomass index using quantitative Methot trawls; to get an an estimation of the biomass and population structure of mesopelagic fish using echo-integration and midwater trawling; to investigate the behaviour of pelagic pre-recruit fish in relation to oceanographic variables; to collect biological material for age, oil content, diet and condition studies on pelagic pre-recruits; to profile currents by means of the acoustic doppler current profiler; and to test the feasibility of using a towed transducer for the acoustic assessment of pelagic pre-recruits.

DOI: 10.15493/DEA.MIMS.51072024

West Coast Hake Biomass Survey on the Africana Voyage 100, February 1992

The West Coast Hake Biomass Survey was conducted on the Africana Voyage 100 from 06 February to 03 March 1992. The objectives of the cruise were to survey by means of bottom trawling the abundance of 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 zooplankton scattering layers and their influence on the feeding behaviour and distribution of small hake; to investigate the feasibility of using carbon and nitrogen isotopes for tracing hake diet; to obtain coverage of chlorophyll-fluorescence distribution at the sea surface as part of an on going monitoring program; to investigate aspects of the feeding, dynamics and reproduction of zooplankton; to obtain information on the hydrology and currents on the West Coast; and to investigate vertical and horizontal distribution of hake south west of Cape Point...

DOI: 10.15493/DEA.MIMS.48072024

Agulhas Bank Boundary Processes on the Africana Voyage 099, January 1992

The Agulhas Bank Boundary Processes was conducted on the Africana Voyage 099, from 07-28 January 1992. The objectives of the cruise were to study the entrainment/loss of biota (fish eggs, larvae and plankton) along the shelf and shelf-edge by currents. This was undertaken by means of Acoustic Doppler Current Profilers (ADCP; current) measurements, and regular collection of biota with a combined bongo/calVET net with u³; to estimate the flux of the Agulhas Current along two lines by means of Conductivity, Temperature, Depth (CTD) and Expendable Bathythermograph (XBT) sections, and ADCP measurements; identification of pulses in the Agulhas Current by means of remote sensing (on board) and possible additional CTD/XBT lines to those shown in the grid map. Also a similar study of major filaments on the West Coast; to contribute to studies on the Agulhas Current influence on the South East coast shelf regions, in particular a) the Algoa Bay ecosystem, and b) the St Francis Bay ecosystem...

DOI: 10.15493/DEA.MIMS.45072024

Pelagic Fish Biomass Survey on the Africana Voyage 097, November 1991

The Pelagic Fish Biomass Survey was conducted on the Africana Voyage 097 from 07 November to 03 December 1991. The objectives of the cruise were to estimate the biomass and population length structure of anchovy, pilchard, and round herring off South Africa by means of echo-integration and midwater trawling; to estimate anchovy biomass by means of the egg production method, and trial estimate pilchard biomass by means of the egg production method; to describe the distribution and behaviour patterns of commercially harvested epi-pelagic and meso-pelagic fish, and the influence of oceanographic variables on these; to collect biological data on reproduction, condition and diet of pelagic fish species; to determine phytoplankton biomass in the nanophytoplankton (<10 µm) and netphytoplankton (>10 µm) size-classes in surface waters; to obtain information on the distribution and abundance of meso-zooplankton; to estimate secondary production rates of adult copepods using the egg...

DOI: 10.15493/DEA.MIMS.21072024

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...

DOI: 10.15493/DEA.MIMS.36072024

Pelagic Pre-Recruit Mesopelagic Biomass Survey on the Africana Voyage 090, March 1991

The Pelagic Pre-Recruit Mesopelagic Biomass Survey was conducted on the Africana Voyage 090 from 05-19 March 1991. The objectives of the cruise were to get an estimation of the biomass and population structure of epi-pelagic pre-recruit fish off the West Coast by means of echo-integration and midwater trawling; get an estimation of an epi-pelagic pre-recruit biomass index using quantitative Methot trawls; get an estimation of the biomass and population structure of mesopelagic fish using echo-integration and midwater trawling; to investigate the behaviour of pelagic pre-recruit fish in relation to oceanographic variables; get a collection of biological material for age, oil content, diet and condition studies on pelagic pre-recruits; to determine oxygen concentrations in rock lobster distribution areas; the profiling of currents by means of the acoustic doppler current profiler; and testing the feasibility of the acoustic assessment of juvenile hake.

DOI: 10.15493/DEA.MIMS.33072024

Plankton Dynamics on the Africana Voyage 089, February 1991

The Plankton Dynamics cruise on the Africana Voyage 089 was conducted from 12-23 February 1991. The objectives of the cruise were to complete a summer transect to provide information on zooplankton vertical migration patterns during the period of maximum upwelling; to contrast hydrological and planktological conditions across the shelf just north of the Columbine divergence, at a time when pelagic fish larvae transported in the jet current were crossing the shelf to the nursery area; to measure rates of primary and secondary production in different size classes of planktonic organisms at offshore (shelf-break), mid shelf and inshore locations; to examine the influence of recent feeding history on the condition of pre-recruit pelagic fish; to measure time-dependent fluctuations in the currents using the acoustic doppler current profiler; and to make measurements of nitrogen dynamics within the planktonic community.

DOI: 10.15493/DEA.MIMS.30072024

West Coast Hake Biomass Survey on the Africana Voyage 088, January 1991

The West Coast Hake Biomass Survey was conducted on the Africana Voyage 088 from 07-29 January 1991. The objectives of the cruise were to survey by means of bottom trawling the abundance of 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 investigate the possible recovery of the stocks of West Coast Sole; to study the biology of chondrichthyan species; to collect material for the electrophoretic comparison of the southern African kingklip, Genypterus capensis, with the Australian G. blacodes and G. microstomus and the South American G. blacodes and G. chilensis; to investigate zooplankton scattering layers and their influence on the feeding behaviour and distribution of small hake; training of Oceanographic Research Assistants; to investigate the feasibility of using carbon and nitrogen isotopes for tracing hake diet; to obtain coverage of...

DOI: 10.15493/DEA.MIMS.09122024

South Coast Demersal Biomass Survey on the Africana Voyage 086, September 1990

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...

DOI: 10.15493/DEA.MIMS.24072024

West Coast Hake Biomass Survey on the Africana Voyage 084, July 1990

The West Coast Hake Biomass Survey was conducted on the Africana Voyage 084 from 12 July - 06 August 1990. The objectives of the cruise were to survey by means of trawling the abundance of adult and recruiting hake in South African waters; to investigate diurnal cycle of hake and other demersal species; to investigate the environmental and ecological interrelationships of hake and other demersal species; to investigate the occurrence, distribution, and abundance of squid; to study the biology of chondrichthyan species; to investigate zooplankton scattering layers and their influence on the feeding and distribution of small hake; to investigate the feasibility of using carbon and nitrogen isotopes for tracing hake diet; to obtain extensive coverage of chlorophyll-fluorescence distribution at the sea surface as part of an ongoing monitoring program; to collect live chaetognaths and medusae for gut evacuation and feeding experiments, and for gut content analysis; and lastly to train...

DOI: 10.15493/DEA.MIMS.12072024

South Coast Demersal Biomass Survey on the Africana Voyage 082, May 1990

The South Coast Demersal Biomass Survey on the Africana Voyage 082 was conducted from 23 May - 13 June 1990. The objectives of the cruise were to survey by bottom-trawling the abundance of adult and recruiting hake, sole and other trawl target species; to make experimental bottom-trawls in deep water to establish the limit of hake distribution, and to collect deep-water specimens of fish and squid; 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; to study the biology of kob; and to train senior staff and oceanographic research assistants.

DOI: 10.15493/DEA.MIMS.11882023

Pelagic Fish Biomass Survey on the Africana Voyage 078, November 1989

The Pelagic Fish Biomass Survey was conducted on the Africana Voyage 078 from 7 - 30 November 1989. The objectives of the cruise were to conduct an estimation of the biomass and population structure of anchovy, pilchard and round herring off South Africa by means of echo-integration and midwater trawling; to conduct an estimation of anchovy biomass by means of the egg production method; to describe the distribution and behaviour patterns of commercially harvested epi-pelagic and meso-pelagic fish, and the influence of oceanographic variables on these; to collect biological data on reproduction, condition and diet of pelagic fish species; to conduct an examination of the distribution, abundance and production of zooplankton in relation to the environment and to pelagic fish distribution, condition, diet and spawning activity; and lastly to conduct a profiling of currents by means of the Acoustic Doppler Current Profiler (ADCP).

DOI: 10.15493/DEA.MIMS.11872023

Physical-Chemical Oceanography Cruise on the Africana Voyage 077, September 1989

The Physical-Chemical Oceanography Cruise was conducted on the Africana Voyage 077, from 11 - 22 September 1989. There were several objectives to this cruise, covering Physical Environment (PE), Sedimentation and Nutrient cycling (SN), Chemical Environment (CE), Shoal Ecology (SE), Plankton studies (P) and testing of the new AIDA acoustic system with possible estimates of biomass in specific places such as in the baroclinic jets. The cruise objectives included identifying and documenting near-surface and mid-water baroclinic jets west of Cape Columbine and Cape Town using acoustic doppler profiling and Conductivity-Temperature-Depth (CTD) data; observing currents in the upper 200m at regular intervals along the cruise track, using the Acoustic Doppler Current Profiler (ADCP); performing a 30 hour internal tide experiment at the shelf edge west of the Chamais Bay; deploying a series of current meter moorings on the Namibian remote shelf and eastern Cape Basin zones between Chamais...

DOI: 10.15493/DEA.MIMS.11862023

West Coast Hake Biomass Survey on the Africana Voyage 075, July 1989

The West Coast Hake Biomass Survey on the Africana Voyage 075 was conducted from 14 July - 17 August 1989. The objectives of the cruise were 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 investigate the environmental and ecological interrelationships of hake and demersal species; to make some experimental trawls in deep water to determine hake distribution limits and 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; to study the biology of sharks and selected non-commercial fish species; to investigate zooplankton scattering layers and their influence on the feeding behaviour of small hake and to extend the primary production data further...

DOI: 10.15493/DEA.MIMS.11852023

South West African Pilchard and Anchovy Biomass Survey on the Africana Voyage 074, June 1989

The South West African Pilchard and Anchovy Biomass Survey was conducted on the Africana Voyage 074 from 22 June - 4 July 1989. The objectives of the survey were to undertake an acoustic / trawling survey of the pilchard stock off SWA and arrive at a stock estimate; to survey the horse-mackerel and anchovy stocks off South West Africa (SWA) and obtain stock estimates if possible and to collect the environmental information on the habitat of the above species primarily by means of Conductivity-Temperature-Depth (CTD) and U³ dips in the upper 200m.

Project

Location

Instrument

License

Essential Ocean Variables

Essential Biodiversity Variables

Selected Records Subset