Search
Search results for
We found
12 results for you
-
Records of poorly known batoid fishes from the north-western Indian Ocean (Chondrichthyes: Rhynchobatidae, Rhinobatidae, Dasyatidae, Mobulidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ABM Moore --- School of Ocean Sciences, UKRecords are presented of several species of batoid fish from the north-western Indian Ocean that are poorly known, of taxonomic interest, or of conservation concern. For the Persian (Arabian) Gulf, the first records of Rhinobatos halavi, Himantura fai, and the... -
Reproductive biology of the milk shark Rhizoprionodon acutus (Carcharhinidae) off the coast of Senegal
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Ba --- Département de Biologie Animale, Faculté des Sciences et Techniques, Senegal CT Ba --- Département de Biologie Animale, Faculté des Sciences et Techniques, Senegal K Diouf --- , Senegal PI Ndiaye --- Département de Biologie Animale, Faculté des Sciences et Techniques, Senegal J Panfili --- , SenegalDespite the considerable commercial value of the milk shark Rhizoprionodon acutus (Rüppell 1837) along the Senegal coast, there are few data on its biology. Milk sharks examined in this study were caught by small-scale fisheries on the Senegalese coast from... -
Patterns of egg deposition and egg development in the catsharks Poroderma pantherinum and Haploblepharus pictus
Item type: Journal Article • Journal: African Zoology • Authors: C. Pretorius --- Marine Biology Research Centre and Department of Biological Sciences, South Africa C. L. Griffiths --- Marine Biology Research Centre and Department of Biological Sciences, South AfricaPatterns of egg deposition and rates of egg development were examined for two endemic South African scyliorhinid shark species: Poroderma pantherinum, the leopard catshark, and Haploblepharus pictus, the dark shy shark. P. pantherinum laid their eggs at an average depth... -
Chondrichthyan occurrence and abundance trends in False Bay, South Africa, spanning a century of catch and survey records
Item type: Journal Article • Journal: African Zoology • Authors: Lauren N. Best --- Percy FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, University of Cape Town, South Africa Colin G. Attwood --- MA-RE Institute, Zoology Department, South Africa Charlene da Silva --- Department of Agriculture, South Africa Stephen J. Lamberth --- Department of Agriculture, South AfricaCommercial fishing in False Bay, South Africa, began in the 1600s. Today chondrichthyans are regularly taken in fisheries throughout the bay. Using a combination of catch, survey and life history data, the occurrence and long-term changes in populations of chondrichthyans... -
Age and growth of the common blacktip shark Carcharhinus limbatus from Indonesia, incorporating an improved approach to comparing regional population growth rates
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JJ Smart --- Centre for Sustainable Tropical Fisheries and Aquaculture, Australia A Chin --- Centre for Sustainable Tropical Fisheries and Aquaculture, Australia AJ Tobin --- Centre for Sustainable Tropical Fisheries and Aquaculture, Australia CA Simpfendorfer --- Centre for Sustainable Tropical Fisheries and Aquaculture, Australia WT White --- CSIRO Oceans & Atmosphere Flagship, AustraliaAge and growth estimates from length‑at‑age data were produced for the common blacktip shark Carcharhinus limbatus from Indonesia. Back‑calculation techniques were used due to a low sample size (n = 30), which was dominated by large, mature sharks. A multi‑model... -
Sexual dimorphism based on body proportions and ontogenetic changes in the Brazilian electric ray Narcine brasiliensis (von Olfers, 1831) (Chondrichthyes: Narcinidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FA Rolim --- Fisheries Institute of São Paulo, Brazil FP Caltabellotta --- Oceanography Department, Brazil MM Rotundo --- Zoological Collection of University of Santa Cecília – UNISANTA, Brazil T Vaske-Júnior --- Elasmobranch Laboratory, BrazilSexual dimorphism in the Brazilian electric ray Narcine brasiliensis from the south‑western Atlantic coast was evaluated based on body proportions and ontogenetic changes. All regions of the body were found to have differences in body proportions between the sexes, except... -
Etmopterus alphus n. sp.: a new lanternshark (Squaliformes: Etmopteridae) from the south-western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DA Ebert --- Pacific Shark Research Center, USA N Straube --- Bavarian State Collection of Zoology, Germany RW Leslie --- Branch: Fisheries Management, South Africa S Weigmann --- University of Hamburg, GermanyA new species of lanternshark, Etmopterus alphus (Squaliformes: Etmopteridae), is described from the south-western Indian Ocean. The new species resembles other members of the ‘Etmopterus lucifer’ clade in having linear rows of dermal denticles and most closely resembles E. molleri... -
Evidence for multiple paternity and confirmation of an Indo-Pacific origin of blacktip shark Carcharhinus limbatus occurring in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AE Bester-van der Merwe --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa SN Maduna --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa KL Hull --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa J Bell --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa C Rossouw --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa SP Wintner --- KwaZulu-Natal Sharks Board, South AfricaThe blacktip shark Carcharhinus limbatus is a cosmopolitan species found in warm-temperate, subtropical and tropical waters around the world. The research here aimed to assess whether multiple paternity exists in South African C. limbatus and to confirm phylogeographic patterns previously... -
Local ecological knowledge demonstrates shifting baselines and the large-scale decline of sawfishes (Pristidae) in Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Braulik --- University of St Andrews, United Kingdom M Kasuga --- Wildlife Conservation Society Tanzania Program, Tanzania G Majubwa --- Ambakofi, TanzaniaSawfishes are coastally distributed rays that grow to very large sizes. All five species are assessed as Endangered or Critically Endangered as a result of population declines caused mainly by entanglements in fishing gear and by habitat degradation. Three species... -
Ectoparasites infecting the heads and gills of commercially valuable marine fishes in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Mark Weston --- , South Africa Irfan Nunkoo --- , South Africa Cecile Reed --- , South Africa Carl D van der Lingen --- , South AfricaThe South African marine environment is highly diverse, containing >12 000 species of flora and fauna. However, the state of knowledge of marine fish parasites in South African waters is still relatively poor. This study used opportunistic sampling to examine... -
Application of DNA mini-barcoding reveals illegal trade in endangered shark products in southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TA Asbury --- , South Africa R Bennett --- , United States AS Price --- , South Africa C da Silva --- , South Africa M Bürgener --- , South Africa JD Klein --- , South Africa SN Maduna --- , South Africa N Sidat --- , Mozambique S Fernando --- , Mozambique AE Bester-van der Merwe --- , South AfricaIn recent decades, a combination of increasing demand and economic globalisation has created a global market for elasmobranch products, especially the highly prized shark fins for Asian markets. Morphological species identification, as well as traditional cytochrome c oxidase subunit I... -
‘Flash Mobula’: first observations of courtship behaviour of the shortfin devil ray Mobula kuhlii
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Carpenter --- University of Cape Town, South Africa C Griffiths --- University of Cape Town, South AfricaFirst-time observations of courtship behaviour of the Endangered shortfin devil ray Mobula kuhlii are described from the Aliwal Shoal Marine Protected Area (MPA), KwaZulu-Natal, South Africa. Three events of M. kuhlii courtship, called ‘mating trains’, were recorded on video during...