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Large allozyme variation within populations and isozyme differences between Clarias gariepinus and C. ngamensis from the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Herman van der Bank Nico SmitAn allozyme study of 47 Clarias gariepinus and 53 C. ngamensis individuals revealed variation at 11 (57.9%) and eight (40%), out of 19 and 20 loci, respectively. The average heterozygosity of 0.167, 57.9% polymorphism and average of 1.895 alleles at... -
Remediation of eutrophic water using Lemna minor in a controlled environment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AA Ansari FA KhanThe growth response of common duckweed Lemna minor was studied at various temperature and pH levels for its possible application for remediating eutrophic waters. The dry weight, chlorophyll a, nitrogen, phosphorus, potassium, peroxidase (POD), catalase (CAT) and malondialdehyde (MDA) levels... -
High prevalence of abnormal liver enzymes in South African patients with type 2 diabetes mellitus attending a diabetes clinic
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: IM Paruk --- Department of Diabetes and Endocrinology, FJ Pirie --- Department of Diabetes and Endocrinology, AA Motala --- Department of Diabetes and Endocrinology, BA Kolawole --- Obafemi Awolowo University, NigeriaObjective: To determine the prevalence of liver function test abnormalities in South African black and Indian adult patients with type 2 diabetes mellitus attending a tertiary diabetes clinic. -
Biochemical and haematological responses in African catfish Clarias gariepinus following chronic exposure to NPK (15:15:15) fertiliser
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MNO Ajima --- Department of Fisheries and Aquaculture Technology, Nigeria OA Ogo --- Department of Biochemistry, Nigeria LE Akpa --- Department of Zoology, Nigeria I Ajaero --- Department of Fisheries and Aquaculture Technology, NigeriaThe indiscriminate use of inorganic fertilisers to boost plant productivity has resulted in negative consequences in aquatic ecosystems. The effects of chronic exposure to NPK (15:15:15) fertiliser at 0.40, 0.80 and 1.60 g l−1 on the haematological and biochemical responses... -
Bacteria with industrial potential from Lake Nakuru, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Musikoyo --- Department of Biological Sciences, Kenya AW Muia --- Department of Biological Sciences, Kenya SO Oduor --- Department of Biological Sciences, KenyaBacteria with industrial potential in Lake Nakuru were isolated and characterised over six months in 2010. The enzymatic activities of 30 isolates towards various macromolecules were investigated by testing their ability to degrade starch, cellulose, casein and lipid substrates. Fifteen... -
Responses of the African catfish Clarias gariepinus to long-term exposure to glyphosate- and paraquat-based herbicides
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OI Ayanda --- Department of Biological Sciences, Nigeria SJ Oniye --- Department of Biological Sciences, Nigeria JA Auta --- Department of Biological Sciences, Nigeria VO Ajibola --- Department of Chemistry, Nigeria OA Bello --- Department of Biological Sciences, NigeriaDirect and indirect contamination of the aquatic environment by pesticides results in a decrease in fish productivity and may elevate concentrations of undesirable chemicals in edible fish tissues. The effects of long-term exposure of Clarias gariepinus juveniles to sublethal concentrations... -
Effects of oats and grazing vetch cover crops and fertilisation on microbial biomass and activity after five years of rotation with maize
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Caroline Mukumbareza --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Pardon Muchaonyerwa --- School of Agricultural, Earth and Environmental Sciences, South Africa Cornelius Chiduza --- Department of Agronomy, Faculty of Science and Agriculture, South AfricaDegraded soil quality could be improved by cover crops. This study determined effects of maize–oats and maize– vetch rotations with or without fertilisation on soil microbial biomass and activity. Winter treatments were oats, vetch and weedy fallow, in rotation with... -
The effect of low-level kelp supplementation on digestive enzyme activity levels in cultured abalone Haliotis midae fed formulated feeds
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Nel --- Department of Ichthyology and Fisheries Science, South Africa BI Pletschke --- Department of Biochemistry and Microbiology, South Africa PJ Britz --- Department of Ichthyology and Fisheries Science, South AfricaPrevious studies have found that macroalgal inclusion in formulated diets for cultured abalone improves feed utilisation, and it was suggested that seaweed-associated bacteria supply enzymes that aid in the animal's digestion. In the present study, we hypothesised that kelp supplementation... -
Biometric variations and oxidative stress responses in juvenile Clarias gariepinus exposed to Termex®
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JU Nnadi --- Department of Zoology and Environmental Biology, Nigeria IN Dimelu --- Department of Home Economics and Hospitality Management Education, Nigeria SI Nwani --- Department of Agriculture Education, Nigeria JC Madu --- Department of Zoology and Environmental Biology, Nigeria CI Atama --- Department of Zoology and Environmental Biology, Nigeria GN Attamah --- Department of Zoology and Environmental Biology, Nigeria JI Okwor --- Department of Zoology and Environmental Biology, Nigeria CD Nwani --- Department of Zoology and Environmental Biology, NigeriaThe current study investigated the effects of termite insecticide, Termex® (imidacloprid 35.50% SC), on biometric variations and oxidative stress biomarkers in Clarias gariepinus. Fish were exposed to 4.00 and 6.00 µg l–1 sublethal Termex® concentrations in 2017. The gill and... -
The effect of Cymbopogon citratus aqueous leaf extract on Solanum lycopersicum seed germination and seedling growth under saline conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Taofik Sunmonu --- Department of Biological Sciences, Nigeria Aishat Mohammed Naibi --- Department of Biological Sciences, Nigeria Suaib Osineye --- Department of Chemical Sciences, Nigeria Hussein Oloyede --- Department of Biochemistry, NigeriaThe allelopathic potential of Cymbopogon citratus aqueous leaf extract on the germination of Solanum lycopersicum seeds under saline conditions was investigated in a laboratory bioassay. At the end of the eight-day trial, the seeds were evaluated for germination parameters and... -
Influences of the arbuscular mycorrhizal fungus Glomus mosseae on morphophysiological traits and biochemical compounds of common bean (Phaseolus vulgaris) under drought stress
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Ali Ganjeali --- Department of Biology, Faculty of Sciences, Iran Elham Ashiani --- Department of Biology, Faculty of Sciences, Iran Maryam Zare --- Department of Biology, Faculty of Sciences, Iran Elahe Tabasi --- Department of Biology, Faculty of Sciences, IranThe symbiosis of arbuscular mycorrhizae (AM) with plant roots can enhance plant responses, especially to drought stress. An experiment was conducted in a growth chamber to examine the impacts of arbuscular mycorrhizae on improving the drought tolerance of common bean... -
Acute toxicity and adverse effects of aqueous and ethanol extracts of Parkia biglobosa pods on biochemical parameters of Clarias gariepinus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KA Bawa-Allah --- Environmental Toxicology Unit, Department of Zoology, Nigeria BO Akinnuoye --- Environmental Toxicology Unit, Department of Zoology, NigeriaThe acute toxicity of the aqueous and ethanol extracts of Parkia biglobosa pods against Clarias gariepinus was investigated under laboratory conditions. Agitated behaviours and respiratory distress were also observed during the exposure period. The adverse effects on biochemical parameters were... -
Mechanisms of drought response in Populus
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Lita Yi --- , China Bin Li --- , China Helena Korpelainen --- , Finland Fei Yu --- , China Lihong Wu --- , China Lingyun Tong --- , China Meihua Liu --- , ChinaDrought affects plant growth and has become a serious problem worldwide. Populus species have different drought tolerance and sensitivity abilities. In order to evaluate the mechanism of drought stress tolerance in different cultivated Populus species distributed in China, the response... -
Comparison of oxidative stress biomarkers in Oreochromis mossambicus in minimally and highly disturbed aquatic environments in the Matabeleland region, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Z Makuvara --- , Zimbabwe J Marumure --- , Zimbabwe L Chapungu --- , Zimbabwe J Machingura --- , South Africa AH Siwela --- , ZimbabweOwing to their ability to provide a functional measure of organismal response to chemical stressors, oxidative biomarkers are useful in ecotoxicological studies to assess disturbance in aquatic environments. This study assessed the use of oxidative stress biomarkers in Oreochromis mossambicus... -
Low hypoxia tolerance in larvae of the sardine Sardinops sagax and anchovy Engraulis encrasicolus may limit their stock recovery in the northern Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Kunzmann --- Leibniz Centre for Tropical Marine Research (ZMT), Germany RM Imam --- Leibniz Centre for Tropical Marine Research (ZMT), Germany SJ Geist --- Leibniz Centre for Tropical Marine Research (ZMT), GermanyPhysiological traits of five key fish species (Cape hake Merluccius spp., pelagic goby Sufflogobius bibarbatus, Cape horse mackerel Trachurus capensis, European anchovy Engraulis encrasicolus and sardine Sardinops sagax) from the northern Benguela upwelling system (NBUS) were compared during their larval...