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Examining the 'global spreading hypothesis' using graph theory
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Jordán T WyattA persistent view, called the 'global spreading hypothesis', maintains that the frequency, magnitude and geographical extent of harmful algal blooms have increased in recent decades. These putative trends have been variously attributed to nutrient enrichment, climate change and inadequate databases... -
Few data but many fish: marine small-scale fisheries catches for Mozambique and Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Jacquet --- Sea Around Us Project, Fisheries Centre, Canada H Fox --- Conservation Science Program, USA H Motta --- WWF Mozambique Coordination Office, Mozambique A Ngusaru --- EAME Programme, WWF-Tanzania Programme Office, Tanzania D Zeller --- Sea Around Us Project, Fisheries Centre, CanadaThe fisheries data supplied to the Food and Agriculture Organization of the United Nations (FAO) by national agencies have served as the primary tool for many global and regional studies. However, it is recognised that these data are incomplete and... -
Temporal and spatial patterns in the abundance of jellyfish in the northern Benguela upwelling ecosystem and their link to thwarted pelagic fishery recovery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BA Flynn --- Department of Biodiversity and Conservation Biology, South Africa AJ Richardson --- Climate Adaptation Flagship, CSIRO Marine and Atmospheric Research, Australia AS Brierley --- Pelagic Ecology Research Group, Scottish Oceans Institute, UK DC Boyer --- National Marine Information and Research Centre (NatMIRC), Namibia BE Axelsen --- , Norway L Scott --- , South Africa NE Moroff --- National Marine Information and Research Centre (NatMIRC), Namibia PI Kainge --- National Marine Information and Research Centre (NatMIRC), Namibia BM Tjizoo --- National Marine Information and Research Centre (NatMIRC), Namibia MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaThere has been debate in the literature about whether jellyfish abundance has increased in the northern Benguela upwelling system, or not, over the past five decades and what impact they are having on pelagic fish. Here we review old expedition... -
Thirty years of monitoring traditional fish trap catches at Kosi Bay, KwaZulu-Natal, South Africa, and management implications
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Kyle --- , South AfricaThe catches of the traditional fish traps in the Kosi Bay estuarine lakes were monitored over a 30-year period from 1981 to 2010. Monitoring data were used to provide estimates of, and insights into, catch size and species composition as... -
Fish utilization of surf-zones. Are they changing? A case study of the Sheltered, warm-temperate King’s Beach
Item type: Journal Article • Journal: African Zoology • Authors: Gavin M. Rishworth --- Department of Zoology, South Africa Nadine A. Strydom --- Department of Zoology, South Africa Warren Potts --- Department of Ichthyology and Fisheries Science, South AfricaSurf-zone fish communities and their shifts over time are generally poorly understood. The aim of this study was to compare the current surf-zone fish assemblage at King's Beach, South Africa, to a similar study conducted three decades ago, before the... -
Reef fish and benthic community structures of the Santa Luzia Marine Reserve in the Cabo Verde islands, eastern central Atlantic Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Freitas --- Faculdade de Engenharia e Ciências do Mar, República de Cabo Verde TC Mendes --- Departamento de Ecologia, Brazil C Almeida --- Faculdade de Engenharia e Ciências do Mar, República de Cabo Verde T Melo --- Biosfera I – Associação para Defesa do Meio Ambiente, República de Cabo Verde RC Villaça --- Departamento de Biologia Marinha, Brazil R Noguchi --- Programa de Engenharia Ambiental, Brazil SR Floeter --- Laboratório de Biogeografia e Macroecologia Marinha, Departamento de Ecologia e Zoologia, Brazil CA Rangel --- Centro Nacional de Avaliação da Biodiversidade e de Pesquisa e Conservação do Cerrado (CBC), Brazil CEL Ferreira --- Departamento de Biologia Marinha, BrazilUnderstanding ecological structures and the dynamics of reef fish assemblages is a fundamental step in current conservation biology. Patterns of abundance and biomass of reef fish communities of the tropical Cabo Verde Archipelago (eastern central Atlantic Ocean) have not been... -
Spatial distribution, seasonal abundance and exploitation status of shark species in Kenyan coastal waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BK Kiilu --- Kenya Fisheries Services, Kenya B Kaunda-Arara --- Department of Fisheries and Aquatic Sciences, Kenya RM Oddenyo --- Coral Reef Conservation Project, Kenya P Thoya --- Kenya Marine and Fisheries Research Institute, Kenya JM Njiru --- Kenya Marine and Fisheries Research Institute, KenyaEfforts to conserve and manage shark populations are often hampered by a lack of basic data, such as species-specific landings and distribution ranges. We bridge this gap in coastal East Africa by providing data on the distributions, catch rates, morphometrics,... -
Life history, distribution and seasonal movements of a threatened South African endemic seabream, Chrysoblephus gibbiceps
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CG Attwood --- Department of Biological Sciences and the Marine Research Institute, South Africa ME Dawson --- Department of Biological Sciences and the Marine Research Institute, South Africa SE Kerwath --- Department of Biological Sciences and the Marine Research Institute, South Africa C Wilke --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South AfricaThe red stumpnose Chrysoblephus gibbiceps (Sparidae) is a South African endemic seabream that has been severely depleted by fishing. A total of 678 C. gibbiceps were sampled by line and trawl fishing for a study of their morphology, age, growth,... -
A review of the populations of tilapiine species in lakes Victoria and Naivasha, East Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Edwine Yongo --- , Kenya Laurent Cishahayo --- , Peoples Republic of China Eunice Mutethya --- , Kenya Bonface Mnang’at Alkamoi --- , Kenya Kokwon Costa --- , Kenya Nzeyimana Jean Bosco --- , Peoples Republic of ChinaThis paper discusses the catch trends, population attributes and biological characteristics of tilapiine species that are both native and that have been introduced into Lake Victoria and Lake Naivasha. Predation by Lates niloticus, species hybridisation, overfishing, pollution and eutrophication have...