A5025946490- Fish Biology and Ecology Studies
- Aquatic Ecosystems and Biodiversity
- Fish Ecology and Management Studies
- Fish biology, ecology, and behavior
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and fisheries research
- Ichthyology and Marine Biology
- Wildlife Ecology and Conservation
- Hydropower, Displacement, Environmental Impact
- Freshwater macroinvertebrate diversity and ecology
- Species Distribution and Climate Change
- Animal Behavior and Reproduction
- Identification and Quantification in Food
- Avian ecology and behavior
- Reproductive biology and impacts on aquatic species
- Coral and Marine Ecosystems Studies
- Amphibian and Reptile Biology
- Cruise Tourism Development and Management
- Water Quality and Pollution Assessment
- Lepidoptera: Biology and Taxonomy
- Rangeland Management and Livestock Ecology
- Food Security and Health in Diverse Populations
- Coastal and Marine Management
- Aquaculture Nutrition and Growth
- Conservation, Biodiversity, and Resource Management
South African Institute for Aquatic Biodiversity
2015-2025
Universität Hamburg
2018
South African Weather Service
2018
Rhodes University
1979-2007
Malawi Government
1977-1990
Lilongwe University of Agriculture and Natural Resources
1978
Abstract Freshwater biodiversity, from fish to frogs and microbes macrophytes, provides a vast array of services people. Mounting concerns focus on the accelerating pace biodiversity loss declining ecological function within freshwater ecosystems that continue threaten these natural benefits. Here, we catalog nine fundamental ecosystem biotic components indigenous provide people, organized into three categories: material (food; health genetic resources; goods), non‐material (culture;...
Abstract Freshwater ecosystems are highly biodiverse 1 and important for livelihoods economic development 2 , but under substantial stress 3 . To date, comprehensive global assessments of extinction risk have not included any speciose groups primarily living in freshwaters. Consequently, data from predominantly terrestrial tetrapods 4,5 used to guide environmental policy 6 conservation prioritization 7 whereas recent proposals target setting freshwaters use abiotic factors 8–13 However,...
Lake Malawi, the third largest lake in Africa, is several million years old. levels have fluctuated to a considerable extent late Pleistocene. Although tectonism may influenced earlier level changes, more recent changes been climatically controlled. Major recessions occurred period before 25000 ago and 10740 ± 130 ago, with further large falls between 1150 1250 A. D. within 1500-1850. The 1500-1850 recession-refilling cycle documented by using variety of techniques. Sediment cores show an...
Human population growth and economic development threaten the integrity of freshwater ecosystems globally, reducing their ability to support biodiversity provide ecosystem services. However, our knowledge is fragmented due bias in conservation research toward primarily terrestrial or charismatic taxonomic groups. Here, we utilize most comprehensive assessment for an entire continent examine implications this shortfall. Results indicate that groups have been focus are poor surrogates patterns...
Abstract Almost all fisheries in the Zambezi River system have experienced severe declines catch rates, loss of larger, most valuable fish species, and increased use environmentally damaging active fishing gears. The Barotse, Caprivi Kafue floodplains, lakes Kariba (Zambian sector), Malawi Malombe are fished down. concept balanced harvesting with moderate effort has no relevance to these African inland fisheries, where rapid human population growth lack alternative livelihoods for...
Downing, A. S., E. Van Nes, J. Balirwa, Beuving, P. Bwathondi, L. Chapman, I. M. Cornelissen, G. Cowx, K. Goudswaard, R. Hecky, H. Janse, Janssen, Kaufman, Kishe-Machumu, Kolding, W. Ligtvoet, D. Mbabazi, Medard, O. C. Mkumbo, Mlaponi, T. Munyaho, Nagelkerke, Ogutu-Ohwayo, Ojwang, Peter, Schindler, Seehausen, Sharpe, Silsbe, Sitoki, Tumwebaze, Tweddle, de Wolfshaar, Dijk, Donk, Rijssel, Zwieten, Wanink, F. Witte, and Mooij. 2014. Coupled human natural system dynamics as key to the...
Lake Malawi's fishes are a source of food for millions and provide livelihood thousands by encouraging tourism, fascinating the scientific fraternity, enchanting aquarists around world maintaining ecosystem processes in lake. From fisheries resource assessment perspective, region is data-poor, but there sufficient peer-reviewed grey literature on limnology, ichthyofauna lake to good overview state fishery. There signs over exploitation an increasing fishing effort has resulted decreased...
The ecology of two commercially important catfish species, Clarias gariepinus and C. ngamensis , was examined in the Elephant Marsh, southern Malawi. Abundance, distribution, movements within marsh system were studied. Growth rates determined from rings on vertebrae, with corroborative evidence length frequency analyses tagging studies. Breeding seasons, age at maturity, fecundity for both species. Stomach contents food preferences species compared.
Non-native fish are considered the most important threat to survival of indigenous freshwater fishes in Cape Floristic Region (CFR). A pilot project evaluate use piscicide rotenone eradicate non-native from selected reaches four rivers has been proposed by CapeNature, conservation authority Western province, South Africa. Each river unique characteristics and challenges achieving eradication restoration its assemblage. The proposal is described management methods available for reducing...
The Zambezi River has a catchment area of 1.32 million km2, including parts eight countries. Three divisions the river are recognised: Upper separated from Middle by Victoria Falls, and Lower below Cahora Bassa gorge. Okavango is also linked to system in wet years an complex geomorphological history. Habitats include forested headwater streams, extensive floodplains, deep gorges, two large man-made lakes delta. On subsistence fisheries exploit natural seasonal cycles, while have...
The growth rates, lengths at maturity, fecundity and natural mortality of several cichlids importance in trawl catches Lake Malawi are described. Growth rates were determined by analysis length frequency data from catches. breeding season for each species was monthly examination the gonads, egg counts ripe ovaries. Lengths maturity calculated proportion mature fish during seasons. Natural an unfished area lake. Values constant K ranged 0.487 to 0.671. ratio asymptotic varied 0.56 0.82....
The multispecies cichlid fisheries of southern Lake Malawi have been managed by control fishing effort, based on Gulland's (1961; Fishery Invest., Lond., Ser. 2, 23: 1—52) modification the Schaefer (1954; Bull. inter-Am, trop. Tuna Commn, 1: 27-56) stock assessment model, together with continual monitoring and adaptation to changes in as they occur. yield estimates are updated this paper. For demersal trawl fishery, which exploits 160+ species, maximum sustainable (MSY) is estimated be 1355...
South Africa is in the process of developing a National Freshwater (Inland) Wild Capture Fisheries Policy. A properly focused research strategy essential to guide policy development process, and thus dedicated 'Inland Fisheries' workshop was convened by African Society for Aquatic Scientists June 2018 update further develop list priority knowledge requirements inland fisheries country. The main themes that emerged during were developed contextualised as ten questions. These were: (1) What...
SUMMARY Observations on the breeding behaviour of mpasa, a commercially valuable cyprinid endemic to Lake Malawi, were conducted in Bua and North Rukuru Rivers. The spawning run takes place over an extended period during after rains, with apparent peak activity May-June. Spawning occurs gravel substratum, often very shallow water, night early morning. Sanjika, close relative spawns similar manner same habitat. male guards territory about 1,5-2 m wide, patrolling regular figure eight until...
Vertebrae from 250 Bagrus meridionalis the southern end of Lake Malawi were used for age and growth determinations. There is a close correlation between ages determined length frequency data obtained by back‐calculation lengths when vertebral rings arc laid down. The are down annually, probably during breeding season. Females grow slightly faster than males, difference being in order 1–2 cm/year early stages. Recruitment to trawl fishery takes place third year life. Both sexes breed first...
This case study of a fish market near the border Namibia and Zambia examines how economic environmental changes have affected marketing channels associated with fishery in southern Africa. We monitored volume origin entering Katima Mulilo, Namibia, between 2007 2012, conducted semi-structured interviews committee members vendors. Prior to 2010, for had simple commodity chain, involving local producers consumers. Since then, nearby lake has refilled, providing new source fish. The expanded...
Lake Liambezi (300 km2) refilled in 2009 after a prolonged 22-year dry period. Its aquatic macrophyte populations, fish fauna and fishery shortly refilling are described. The emergent Phragmites australis formed dense stands covering large parts of the lake, while extensive beds submerged Lagarosiphon ilicifolius Najas horrida occurred shallower areas. Twenty-nine species were recorded experimental gillnets. Catches dominated by Brycinus lateralis Schilbe intermedius, contributing 39.5%...