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Southern African Journal of Aquatic Sciences最新文献

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PRELIMINARY OBSERVATIONS ON THE FISH POPULATIONS OF THE RECENTLY-IMPOUNDED KATSE RESERVOIR, LESOTHO 莱索托最近被扣押的katse水库鱼类种群的初步观察
Southern African Journal of Aquatic Sciences Pub Date : 1997-11-24 DOI: 10.1080/10183469.1997.9631397
D. Tweddle, M. Davies
{"title":"PRELIMINARY OBSERVATIONS ON THE FISH POPULATIONS OF THE RECENTLY-IMPOUNDED KATSE RESERVOIR, LESOTHO","authors":"D. Tweddle, M. Davies","doi":"10.1080/10183469.1997.9631397","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631397","url":null,"abstract":"Summary Katse is a new 35 km long impoundment on the Malibamatso River, a highland tributary of the Orange River in Lesotho. Two fishing surveys in 1996 yielded Barbus aeneus, Labeo capensis, Oncorhynchus mykiss and the occasional Austroglanis sclateri. Length frequency data for the first three species show modes which may represent year classes, although gillnet selectivity also plays a role. Barbus aeneus is abundant throughout the reservoir and could support a subsistence fishery. Labeo capensis is segregated by sex in the breeding season, with males remaining on the spawning grounds at the river mouths while females visit the spawning grounds for a short time to shed their eggs. The absence of small-sized Oncorhynchus mykiss in the catch may be due to pollution from mining and construction affecting the spawning grounds. The catches of larger trout and the outstanding scenery suggest that a tourist sport fishery could be developed on the reservoir based on natural recruitment supplemented, if necessar...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130945579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
A COMPARISON OF CYPRINID FISH POPULATIONS IN THREE LARGE TRANSKEI RESERVOIRS WITH RESPECT TO ABUNDANCE AND REPRODUCTION 特兰斯凯三个大型水库中鲤科鱼类种群的丰度和繁殖比较
Southern African Journal of Aquatic Sciences Pub Date : 1993-06-01 DOI: 10.1080/10183469.1993.9631340
M. Schramm
{"title":"A COMPARISON OF CYPRINID FISH POPULATIONS IN THREE LARGE TRANSKEI RESERVOIRS WITH RESPECT TO ABUNDANCE AND REPRODUCTION","authors":"M. Schramm","doi":"10.1080/10183469.1993.9631340","DOIUrl":"https://doi.org/10.1080/10183469.1993.9631340","url":null,"abstract":"Summary Gill net catches of fish in three turbid reservoirs (Lakes Xonxa and Lubisi on the Kei River system and Lake Umtata on the Mtata River) between 1982 and 1985 were dominated by two cyprinids the common carp, Cyprinus carpio, and smallmouth yellowfish, Barbus aeneus. Mean catch per unit effort of carp was low in all three reservoirs (5–6.5 fish 120 m net−1) while smallmouth yellowfish, absent from Lake Umtata, were abundant in Lakes Lubisi and Xonxa (62.9 and 131.5 fish 120 m net−1, respectively). Monthly changes in the gonadosomatic index and gonad state of carp as well as direct observations of spawning fish showed that egg laying in this species occurred only once rising water levels inundated marginal vegetation. Regional weather patterns characterised by heavy mid- and late summer rains lead to late, relatively unsuccessful spawning by carp and may account for their low abundance in local reservoirs. Growth of yellowfish in Lake Lubisi was poorer and size at sexual maturity smaller than in Lake...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121668082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
DIET AND REPRODUCTIVE ACTIVITY OF THE ESTUARINE ROUNDHERRING GILCHRISTELLA AESTUARIA IN CUBHU, A FRESHWATER COASTAL LAKE IN NORTHERN NATAL, SOUTH AFRICA 南非纳塔尔省北部淡水湖古巴河口圆鲱鱼的饮食和繁殖活动
Southern African Journal of Aquatic Sciences Pub Date : 1993-06-01 DOI: 10.1080/10183469.1993.9631336
D. Cyrus, E. Wellmann, T. J. Martin
{"title":"DIET AND REPRODUCTIVE ACTIVITY OF THE ESTUARINE ROUNDHERRING GILCHRISTELLA AESTUARIA IN CUBHU, A FRESHWATER COASTAL LAKE IN NORTHERN NATAL, SOUTH AFRICA","authors":"D. Cyrus, E. Wellmann, T. J. Martin","doi":"10.1080/10183469.1993.9631336","DOIUrl":"https://doi.org/10.1080/10183469.1993.9631336","url":null,"abstract":"Summary A study of the diet and reproductive activity of Gilchristella aestuaria revealed that active gonads were present throughout the year. The main breeding season appeared to be from spring through to autumn with two distinct peaks occurring from August to October and February to April. The species diet in Lake Cubhu consisted predominantly of the amphipod Corophium triaenonyx which where actively selected by larger specimens while it appeared that juveniles utilised a filter feeding approach taking copepods and other planktonic organisms. The specific prey items taken varied to some degree from those recorded in other studies but this was largely due to the fact that Cubhu is a freshwater system while most other studies were on G. aestuaria from estuarine localities. The morphology of G. aestuaria in Cubhu, larger eyes and more cylindrical body, is typical of the non-filter feeding G. aestuaria described from systems with low plankton densities where selection of individual prey items takes place.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"260 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115883264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
IMPLICATIONS OF WATER RELEASE FROM THE PONGOLAPOORT DAM FOR THE FISH AND FISHERY OF THE PHONGOLO FLOODPLAIN, ZULULAND 蓬戈洛港大坝放水对祖鲁兰蓬戈洛漫滩渔业的影响
Southern African Journal of Aquatic Sciences Pub Date : 1993-06-01 DOI: 10.1080/10183469.1993.9631338
G. S. Merron, M. Bruton, P. L. H. D. Lalouviere
{"title":"IMPLICATIONS OF WATER RELEASE FROM THE PONGOLAPOORT DAM FOR THE FISH AND FISHERY OF THE PHONGOLO FLOODPLAIN, ZULULAND","authors":"G. S. Merron, M. Bruton, P. L. H. D. Lalouviere","doi":"10.1080/10183469.1993.9631338","DOIUrl":"https://doi.org/10.1080/10183469.1993.9631338","url":null,"abstract":"Summary Wetland fish stocks can usually be sustained as long as the natural flood regime is maintained, but unnatural disruption of the flooding pattern can interfere with fish spawning and feeding. The dynamics of the Phongolo floodplain fish community are determined by periodically changing abiotic factors, especially water level and water temperature, and biotic factors, especially food availability. Water level fluctuations have several important functions and result in pulses of nutrient input and fish abundance. This paper examines the implications of the timing, magnitude and duration of simulated flood releases from the Pongolapoort Dam on the downstream fish and fishery.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128953418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
CHANGES IN URBAN RESIDENTIAL LAND IN THE RIETSPRUIT CATCHMENT, SOUTHERN TRANSVAAL 德兰士瓦省南部rietspruit流域城市住宅用地的变化
Southern African Journal of Aquatic Sciences Pub Date : 1993-06-01 DOI: 10.1080/10183469.1993.9631341
M. Silberbauer, J. Moolman
{"title":"CHANGES IN URBAN RESIDENTIAL LAND IN THE RIETSPRUIT CATCHMENT, SOUTHERN TRANSVAAL","authors":"M. Silberbauer, J. Moolman","doi":"10.1080/10183469.1993.9631341","DOIUrl":"https://doi.org/10.1080/10183469.1993.9631341","url":null,"abstract":"Summary Informal settlements have become an important and rapidly-expanding component of urban development in South Africa. In the Rietspruit catchment, south-west of Johannesburg, average growth rates in urban land cover of up to 2.7 km2 per year (1972–1991) were measured from satellite images. Aerial photographs show that in 1991 more than a third of the residential land consisted of informal housing. Elevated concentrations of dissolved nitrogen, phosphorus and faecal coliforms in the Rietspruit point to a possible eutrophication and health risk.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130495697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
AN HOLISTIC APPROACH TO THE MANAGEMENT OF WATER QUALITY IN FALSE BAY, CAPE TOWN, SOUTH AFRICA 南非开普敦福尔斯湾水质管理的整体方法
Southern African Journal of Aquatic Sciences Pub Date : 1993-06-01 DOI: 10.1080/10183469.1993.9631339
A. Quick
{"title":"AN HOLISTIC APPROACH TO THE MANAGEMENT OF WATER QUALITY IN FALSE BAY, CAPE TOWN, SOUTH AFRICA","authors":"A. Quick","doi":"10.1080/10183469.1993.9631339","DOIUrl":"https://doi.org/10.1080/10183469.1993.9631339","url":null,"abstract":"Summary An overview of the water quality status of False Bay identified the bacterial/viral water quality of stormwater and rivers discharging near contact recreation beaches to be the management concern of highest priority. A second water quality concern is the potential impact of nutrients being discharged into False Bay on the surf zone and bay ecosystems. Heavy metals, hydrocarbons and industrial chemical discharges into the Bay are not regarded as a serious water quality threat. Much of the future development planned for Metropolitan Cape Town will impact on the volume and water quality of rivers, groundwater, stormwater and wastewater flowing into False Bay; hence the need for an integrated catchment management approach to the management of the bay. An assessment of the constraints facing the holistic management of the bay and catchment concludes that the four main concerns are: (1) a lack of key research information on the options for stormwater management, and on the loading and potential impacts ...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127951575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
A TRIBUTE TO MARJORIE SCOTT ON THE AWARD OF THE GOLD MEDAL OF THE SOUTHERN AFRICAN SOCIETY OF AQUATIC SCIENTISTS, OCTOBER 1993 向马乔里·斯科特致敬，获南部非洲水生科学家协会金奖，1993年10月
Southern African Journal of Aquatic Sciences Pub Date : 1993-06-01 DOI: 10.1080/10183469.1993.9631335
J. Day
{"title":"A TRIBUTE TO MARJORIE SCOTT ON THE AWARD OF THE GOLD MEDAL OF THE SOUTHERN AFRICAN SOCIETY OF AQUATIC SCIENTISTS, OCTOBER 1993","authors":"J. Day","doi":"10.1080/10183469.1993.9631335","DOIUrl":"https://doi.org/10.1080/10183469.1993.9631335","url":null,"abstract":"Taylor & Francis makes every effort to ensure the accuracy of all the information (the “Content”) contained in the publications on our platform. However, Taylor & Francis, our agents, and our licensors make no representations or warranties whatsoever as to the accuracy, completeness, or suitability for any purpose of the Content. Any opinions and views expressed in this publication are the opinions and views of the authors, and are not the views of or endorsed by Taylor & Francis. The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127288140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SHORT-TERM IMPACTS OF FORMULATIONS OF BACILLUS THURINGIENSIS VAR. ISRAELENSIS DE BARJAC AND THE ORGANOPHOSPHATE TEMEPHOS, USED IN BLACKFLY (DIPTERA: SIMULIIDAE) CONTROL, ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE MIDDLE ORANGE RIVER, SOUTH AFRICA 用于防治黑蝇(双翅目:拟蝇科)的苏云金芽孢杆菌制剂和有机磷双硫磷对南非橙河中部嗜流底栖大型无脊椎动物的短期影响
Southern African Journal of Aquatic Sciences Pub Date : 1993-01-18 DOI: 10.1080/10183469.1993.9631337
R. Palmer
{"title":"SHORT-TERM IMPACTS OF FORMULATIONS OF BACILLUS THURINGIENSIS VAR. ISRAELENSIS DE BARJAC AND THE ORGANOPHOSPHATE TEMEPHOS, USED IN BLACKFLY (DIPTERA: SIMULIIDAE) CONTROL, ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE MIDDLE ORANGE RIVER, SOUTH AFRICA","authors":"R. Palmer","doi":"10.1080/10183469.1993.9631337","DOIUrl":"https://doi.org/10.1080/10183469.1993.9631337","url":null,"abstract":"Summary The impacts of larvicides used in the control of blackflies (Diptera: Simuliidae) on macroinvertebrates in the stones-in-current biotope were assessed during 8 field trials in the middle Orange River, South Africa. Two Bacillus thuringiensis var. israelensis (B.t.i.) products (VectobacR 12AS and TeknarR HP-D) and the organophosphate temephos (AbateR 200EC) were applied at recommended and high dosages to simulate “operational” and “worst-possible” scenario's respectively. Mortality was evaluated either by direct counting of invertebrates on stones before and after application, or by ranking invertebrates on a 4-point relative abundance scale before and after application. In addition, the re-appearance of benthic invertebrate population densities after temephos application was examined. At the recommended dosage (1.2 ppm/10 min), B.t.i. significantly reduced blackfly larval numbers (P<0.001) and those of the chironomid Rheotanytarsus fuscus Freeman (P<0.05). At high dosage (20 ppm/10 min), numbers o...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132814799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
MANAGEMENT OPTIONS FOR SHALLOW HYPERTROPHIC LAKES, WITH PARTICULAR REFERENCE TO ZEEKOEVLEI, CAPE TOWN 浅层肥厚湖泊的管理选择，特别参考开普敦的zeekoevlei
Southern African Journal of Aquatic Sciences Pub Date : 1992-06-01 DOI: 10.1080/10183469.1992.9631321
W. Harding, A. Quick
{"title":"MANAGEMENT OPTIONS FOR SHALLOW HYPERTROPHIC LAKES, WITH PARTICULAR REFERENCE TO ZEEKOEVLEI, CAPE TOWN","authors":"W. Harding, A. Quick","doi":"10.1080/10183469.1992.9631321","DOIUrl":"https://doi.org/10.1080/10183469.1992.9631321","url":null,"abstract":"Summary Zeekocvlei, a freshwater coastal lake, is an important regional recreation area in the south-western Cape, South Africa. The lake is hypertrophic, experiences perenially dense populations of cyanobacteria (Microcystis), invasive bulrush and reed encroachment, and has a thick benthic layer of sediments rich in organic matter. User and scientific surveys have indicated that management problems centre around the dense phytoplankton population and the nutrient loading of the lake. Both in-lake and catchment-based management options for improving the water quality of the lake were evaluated. Given the present socio-economic constraints in South Africa, only catchment-based management can be recommended before any rehabilitation measures are undertaken in the lake itself. This would entail the investigation and implementation of measures to reduce levels of catchment-derived nutrient loading by managing the water quality of agricultural (predominantly horticulture) and urban catchment runoff.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122222683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
TURBIDITY GRADIENTS IN TWO INDO-PACIFIC ESTUARIES AND THEIR INFLUENCE ON FISH DISTRIBUTION 印度太平洋两个河口的浊度梯度及其对鱼类分布的影响
Southern African Journal of Aquatic Sciences Pub Date : 1992-06-01 DOI: 10.1080/10183469.1992.9631324
D. Cyrus
{"title":"TURBIDITY GRADIENTS IN TWO INDO-PACIFIC ESTUARIES AND THEIR INFLUENCE ON FISH DISTRIBUTION","authors":"D. Cyrus","doi":"10.1080/10183469.1992.9631324","DOIUrl":"https://doi.org/10.1080/10183469.1992.9631324","url":null,"abstract":"Summary Research undertaken in two widely separated estuaries in the Indo-Pacific, showed that both have distinct turbidity gradients. In the turbid St Lucia System, on the South East Coast of Africa (range 2 to 568 Nephelometric Turbidity Units (NTU)), different turbidity patterns were observed during summer and winter. The Embley Estuary, on the eastern side of the Gulf of Carpentaria, Queensland, Australia, although also turbid, had a much more restricted range (0.6 to 55.0 NTU), and showed three distinct seasonal patterns, referred to as the Wet, Early Dry and Late Dry. Studies undertaken at St Lucia illustrated that turbidity had a direct influence on fish distribution in the system. The Embley Estuary was found to have species groups which were associated with specific turbidity levels. As only a limited range of turbidity occurred, these groups were somewhat restricted in composition. Comparisons made of the turbidities occupied by 13 fish taxa common to the different systems showed that nine had s...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123419335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
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