A5029149442- Marine and fisheries research
- Fish Ecology and Management Studies
- Coral and Marine Ecosystems Studies
- Fish Biology and Ecology Studies
- Ichthyology and Marine Biology
- Coastal and Marine Management
- Marine animal studies overview
- Marine Bivalve and Aquaculture Studies
- Aquatic Ecosystems and Biodiversity
- Marine Biology and Ecology Research
- Mathematics and Applications
- Marine and coastal ecosystems
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Heat Transfer and Numerical Methods
- Aquatic Invertebrate Ecology and Behavior
- Genetic and phenotypic traits in livestock
- Economic theories and models
- Sustainability and Ecological Systems Analysis
- Fish biology, ecology, and behavior
- History and Theory of Mathematics
- Genetic diversity and population structure
- Turtle Biology and Conservation
- Marine and coastal plant biology
- Global Energy and Sustainability Research
- South African History and Culture
University of Cape Town
2015-2024
Ministry of Agriculture Forestry and Fisheries
2013
The dispersal of the surf-zone teleost galjoen (Coracinus capensis) from De Hoop Marine Reserve, South Africa, was investigated. Over a period 5.5 yr, 11 022 were tagged in centre reserve. Most 1008 recoveries at site release, while remainder covered distance up to 1040 km. There no difference with respect age, sex, or season between those that dispersed and did not. Six models developed test hypotheses (1) are polymorphic behaviour, (2) nonreporting tags masks random process, (3) recovery...
This study was designed to establish whether populations of fish species important in the catches rock and surf anglers increased following proclamation De Hoop Marine Reserve on southern coast South Africa Catch per unit effort (CPUE) size frequency distributions angling were monitored approximately monthly by from shore at 2 sites reserve.At one site sampling commenced yr before reserve established continued 4.5 thereafter, allowing comparisons periods exploitation protection.The other had...
Abstract A discrete, space-time, age-structured model of a fishery was developed to test the effect marine reserves on yield fish recreational angling. The applied three sympatric surf-zone species commonly targeted by shore-anglers. Movement rates white steenbras Lithognathus lithognathus and galjoen Dichistius capensis, both which are nomadic, were estimated from tag-recovery data. Because post-recruit blacktail Diplodus Sargus capensis resident, coefficient passive larval diffusion...
The use of marine protected areas (MPAs) in South Africa should be revised the light growing problems related to over-use resources. No consistent policy has been applied establishment and management MPAs. Existing MPAs include reserves, restricted areas, single-species National Parks, estuarine trawling reserves offshore islands, declared under a variety legislation. Marine have Sea Fishery Act, but are managed by provincial authorities. authorities Northern, Western Eastern Cape lack...
Shark attacks on humans are high profile events which can significantly influence policies related to the coastal zone. A shark warning system in South Africa, Spotters, recorded 378 white (Carcharodon carcharias) sightings at two popular beaches, Fish Hoek and Muizenberg, during 3690 six-hour long spotting shifts, months September May 2006 2011. The probabilities of were environmental variables using Binomial Generalized Additive Mixed Models (GAMMs). Sea surface temperature was...
Abstract South Africa sought to implement an ecologically representative Marine Protected Area (MPA) network achieve biodiversity and fisheries management goals with least impact on offshore stakeholders. The result was the declaration of a spatially efficient representing 131 150 marine ecosystem types (87%) in 5.4% ocean area. We outline 15‐year process from planning implementation 20 new MPAs, including contentious areas recognized as important for conservation decades ago. Systematic...
Abstract Marine protected areas (MPAs) have become necessary to counter modern threats marine biodiversity and the sustainability of fisheries. Sensitive habitats, including coral reefs, estuaries mangroves, been effectively in large MPAs, which control resource use. Protection from pollution physical destruction by fishing gear are important functions MPAs tropical temperate regions. used protect endangered species allow population recoveries. The advantages for fishery management include...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 362:245-259 (2008) - DOI: https://doi.org/10.3354/meps07410 Effects of fishing on population structure and life history roman Chrysoblephus laticeps (Sparidae) Albrecht Götz1,2,*, Sven E. Kerwath1, Colin G. Attwood3, Warwick H. Sauer1 1Department Ichthyology Fisheries Science, Rhodes University, 6140...
Abstract: The application of no‐take areas in fisheries remains controversial. Critics argue that many targeted species are too mobile to benefit from area protection and only appropriate for resident species. degree does not depend on the size but rather time fish reside inside its boundaries during key life‐history events (i.e., spawning) periods peak fishing activity. We evaluated potential a small marine protected (MPA) coastal embayment as harvest refuge mobile, possibly migratory,...
Abstract Attwood, C. G., Petersen, S. L., and Kerwath, E. 2011. Bycatch in South Africa's inshore trawl fishery as determined from observer records. – ICES Journal of Marine Science, 68: 2163–2174. Ship-based data were analysed to describe the volume, composition, utilization, size structure catches made by trawlers. The sampling rate was 3.5% all trawls, including unsorted discard samples. In all, 137 nominal species recorded. Analysis composition separated trawling grounds into seven...
Sharks have been shown to benefit from the protection of marine protected areas (MPAs). There is, however, little information on degree by MPAs shark populations. The movements individual smoothhound sharks Mustelus mustelus in, and adjacent to, a small (34 km2) no-take MPA (Langebaan Lagoon Marine Protected Area; LMPA) situated west coast South Africa were investigated over two years using acoustic telemetry. spent majority time (in hours, average 79%) inside reserve, some (n = 2 15...
Marine protected areas (MPAs) play an important role in coastal conservation, but there is presently no uniformly applied methodology for monitoring the efficacy of fish protection. Whereas underwater visual census and controlled angling surveys have been used, their skilled-labour requirements environmental impact prevented nation-wide application South Africa. We used a baited remote video system (BRUVs) to provide first survey reef fishes Stilbaai MPA (SMPA), assessed deployment time...
Information on the movement of fish is vital to determine effectiveness marine protected areas (MPAs) for conservation and fisheries management. This study investigates area utilisation activity patterns 13 adult roman Chrysoblephus laticeps (Sparidae) using telemetry underwater observations. Acoustic transmitters implanted into C. in tanks had no apparent effects growth mobility. Natural behaviour treated field was verified by SCUBA divers. Manual boat- diver-based tracking carried out...
Abstract Exploitation of temperate reef fish not only affects the target species but potentially changes composition assemblages. This study investigated effect fishing on ichthyofaunal community at protected and exploited sites around Goukamma Marine Protected Area (MPA) South African south coast. Abundance size frequency data from 273 standardised angling 44 underwater visual census were analysed with generalised linear modelling multivariate techniques to separate effects exploitation,...
Fish telemetry is increasingly used to study fish behaviour in marine systems and it crucial that the tagging does not affect welfare negatively. Hence, long-term effects of surgically implanted acoustic transmitters on survival, tag retention, healing growth Pomatomus saltatrix (known as tailor Australia, elf South Africa bluefish North America) were studied over 144 days. P. are well suited for transmitter implants because no tagging-related short- or mortality expulsion was recorded....
The age, growth and reproductive biology of the blue shark Prionace glauca from South African waters were assessed using 205 specimens, ranging in total length (TL) 72 to 313 cm. Greater number males (120) than females (85) examined as they more frequently caught. Age parameters estimated a von Bertalanffy model; estimates for sexes combined L ∞ = 311.6 cm, k 0.12 y−1 t 0 −1.66 y. Sex-specific curves not significantly different (F-statistic 1.59, df 3 197, p > 0.05). Growth our study fall...
This paper examines the increasingly close interaction between natural and social scientists, non‐governmental organizations (NGO) industry, in pursuit of responsible ecosystem‐based management fisheries. South Africa has committed to implementing an ecosystem approach fisheries management. Management advice stems from multi‐stakeholder representation on government‐led scientific working groups. In hake Merluccius capensis paradoxus fishery, primary measure is annual total allowable catch (...
Global declines in chondrichthyan populations necessitate evidence‑based planning for their conservation. False Bay, south‑west South Africa, has a high diversity of marine biota, with Atlantic and Indian Ocean influences, but its fauna is poorly described ecologically. Bay long fishing history supports various harvesting methods, including shark‑directed fishing. This the first baited remote underwater video system (BRUVs) survey relative abundance, seasonal distribution chondrichthyans...