A5077683873- Fish Ecology and Management Studies
- Ichthyology and Marine Biology
- Marine and fisheries research
- Fish Biology and Ecology Studies
- Coral and Marine Ecosystems Studies
- Marine animal studies overview
- Marine Bivalve and Aquaculture Studies
- Paleontology and Evolutionary Biology
- Maritime and Coastal Archaeology
- Indigenous Studies and Ecology
- Marine Ecology and Invasive Species
South African Association for Marine Biological Research
2015-2024
Abstract The white‐spotted wedgefish ( Rhynchobatus djiddensis ) is a Critically Endangered shark‐like ray in the family Rhinidae. Throughout its Western Indian Ocean distribution, it targeted for valuable meat and fins reported to have undergone major population declines. However, there remains need species specific time‐series data accurately assess localized This study used two independent long‐term (37 40 years) catch from competitive shore angling shark nets investigate size composition...
The International Union for Conservation of Nature (IUCN) estimates that over a third all chondrichthyan species (sharks, rays and chimaeras) are threatened with extinction, primarily by overfishing (as target or bycatch species). Owing to the wide-ranging distributions many chondrichthyans, they often overlooked in marine protected area (MPA) design. South Africa is biodiversity hotspot diversity, improve conservation status these country's continental exclusive economic zone (EEZ), we...
Information on the movement ecology of endangered species is critical for implementation effective conservation measures. This study made use a long-term dart tagging dataset to reveal patterns and growth rates two size classes Critically Endangered whitespotted wedgefish Rhynchobatus djiddensis within its southern African distribution, which can have important implications fisheries management. A total 4 768 individuals were tagged with 340 recaptures recorded, ranging from 1 2 639 days...
AbstractThe African blackspot shark Carcharhinus humani (until now commonly known as Human's whaler shark) is a small-sized requiem (family Carcharhinidae) found in tropical coastal waters of the western Indian Ocean far south Port St Johns on east coast South Africa. It was only recently recognised being distinct from C. sealei, which occurs elsewhere Indo-Pacific. This study utilised four datasets to investigate movements, temporal and geographic distributions, life history population...
The conservation status of several pelagic shark species is considered vulnerable with declining populations, yet data on fishing mortality remain limited for large ocean regions. Pelagic sharks are increasingly retained by mixed-species fisheries, or discarded and not reported selective fisheries tunas (Thunnus spp.) swordfish (Xiphias gladius). We estimated the (landings plus discard mortalities) in a South African-flagged longline fishery diverse targeting behaviour. A hierarchical...
Context Sharks that are targeted by recreational anglers and commercial fisheries can be vulnerable to overexploitation when fishing effort is not informed or regulated data on relative distribution growth. Aims To understand the spatiotemporal distribution, movement patterns, growth rates of bronze whaler sharks (Carcharhinus brachyurus) in southern Africa. Methods Tag–recapture records derived from a 36-year cooperative shore-angling program were compiled analysed using non-parametric...
The diamond ray Gymnura natalensis is endemic to southern Africa where its preference for shallow coastal habitats makes it vulnerable recreational shore-based angling. Although up approximately 1% of the tag numbers, little known about movements, reproduction or population status in South Africa. This study used three independent long-term (34–41 years) datasets, including tagging by anglers, competitive shore angling catches and shark net catches, investigate species' catch composition Of...
A tag-recapture study was undertaken on Polysteganus praeorbitalis in the Pondoland Marine Protected Area (PMPA) east coast of South Africa. total 1 042 fish were tagged over a period 16 years and 255 individuals (24.5%) recaptured, some them multiple occasions. Data analysis showed that 84.7% recaptured remained relatively small home ranges (-750 m linear distance), while 13.3% abandoned their undertook unidirectional movements (of 21-1 211 km) along KwaZulu-Natal north-easterly direction,...
Scientific output has proven the value of Oceanographic Research Institute's Cooperative Fish Tagging Project (ORI-CFTP) to biological and fisheries research, with more than 95 published manuscripts based on data from ORI-CFTP. This study reviews project perspective participating anglers. A total 267 members ORI-CFTP responded an online survey designed gather profile tagging members, their preferred methods communication, attitudes towards fish conservation in general, changes angling...
The assumption of a proportional relationship between catch-per-unit-effort (CPUE) and the abundance sharks caught by pelagic longliners is tenuous when based on fisher logbooks that report only retained specimens. Nevertheless, commercial landings statistics are often data available for stock status assessments. Logbook collected from local foreign longline vessels operating in four areas off southern Africa 2000 2015 were used to construct standardized CPUE indices blue Prionace glauca...
AbstractMovement behaviour of the endemic epinephelid Mycteroperca andersoni (formerly allocated to genus Epinephelus) along east coast southern Africa was investigated using both conventional dart tagging and passive acoustic telemetry. Results from methods showed that this species is likely be a temporary resident on shallow inshore reefs; fish high site fidelity occupied relatively small home ranges for periods seldom exceeding 12 months, whereafter they appeared undertake ranging-type...
Dinoperca petersi is a relatively common fish species caught in the line-fishery KwaZulu-Natal (KZN), South Africa. Yet, little known about biology and ecology of this species. Movement patterns growth rate were studied based on data obtained from long-term tag-recapture study conducted iSimangaliso Marine Protected Area northern KZN between 2001-2019. Results showed that D. highly resident with linear home-range size 290-405 m. While most high site fidelity, 8.8 % tagged wider ranging...
AbstractA tag-recapture study was undertaken on the Natal seacatfish Galeichthys troworum in Pondoland Marine Protected Area (PMPA) east coast of South Africa. A total 473 fish were tagged over a period 8 years, and 136 individuals (28.8%) recaptured 16 some them multiple occasions. Most recaptures (82%) caught within 200 m their release site, with movements ranging between 0 617 m, time-at-liberty 3 407 days (9.3 years). Data analysis showed that all remained relatively small home ranges...