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ZOOPLANKTON OF THE MHLATHUZE (RICHARDS BAY) ESTUARY: AN OVERVIEW, WITH COMMENTS ON FRESHWATER REQUIREMENTS mhlathuze(理查兹湾)河口的浮游动物:概述，对淡水需求的评论
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631419
H. Jerling
{"title":"ZOOPLANKTON OF THE MHLATHUZE (RICHARDS BAY) ESTUARY: AN OVERVIEW, WITH COMMENTS ON FRESHWATER REQUIREMENTS","authors":"H. Jerling","doi":"10.1080/10183469.1998.9631419","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631419","url":null,"abstract":"Summary The Mhlathuze estuary in its present form was established during construction of the Richards Bay harbour during the early 1970s. This paper summarises available data on the zooplankton community as part of a study on the freshwater requirements of the estuary. The zooplankton community indicates a strong marine influence. The large tidal exchange prevents the establishment of a stable estuarine zooplankton community. The possible influences of changes in freshwater input are discussed.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132625227","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: 3
MANAGEMENT, CONSERVATION AND RESEARCH OF INTERNATIONALLY SHARED WATERCOURSES IN SOUTIIERN AFRICA—NAMIBIAN EXPERIENCE WITH THE OKAVANGO RIVER AND RIVERS OF THE EASTERN CAPRIVI 南非洲国际共享水道的管理、保护和研究——纳米比亚在奥卡万戈河和卡普里维东部河流方面的经验
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631410
E. Taylor, S. Bethune
{"title":"MANAGEMENT, CONSERVATION AND RESEARCH OF INTERNATIONALLY SHARED WATERCOURSES IN SOUTIIERN AFRICA—NAMIBIAN EXPERIENCE WITH THE OKAVANGO RIVER AND RIVERS OF THE EASTERN CAPRIVI","authors":"E. Taylor, S. Bethune","doi":"10.1080/10183469.1998.9631410","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631410","url":null,"abstract":"Summary Although the emphasis of the recent National Rivers Research Initiative (now the Research Programme for the Management of Rivers) in South Africa was on river research in that country, the reality is that in southern Africa many watercourses are shared by more than one country. Therefore a central issue in integrated river basin management and development should be the recognition of the principle of international joint planning, conservation, monitoring and research. Co-operation and a better understanding of shared waters would prevent deleterious impacts, not only in the country where they occur, but also in those downstream. With this in mind, since the early 1980s Namibia has worked on joint cross-border projects in efforts to manage and conserve her shared water bodies. These include joint river gauging exercises, biological control of Saivinia molesta in the eastern Caprivi region and, more recently, the application of a biological monitoring technique, the South African Scoring System vers...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126159959","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
COMPOSITION, ABUNDANCE AND SEASONALITY OF LARVAL FISH IN RICHARDS BAY HARBOUR, KWAZULU-NATAL, SOUTH AFRICA 南非夸祖鲁-纳塔尔省理查兹湾港幼鱼的组成、丰度和季节性
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631388
S. A. Harris, D. Cyrus
{"title":"COMPOSITION, ABUNDANCE AND SEASONALITY OF LARVAL FISH IN RICHARDS BAY HARBOUR, KWAZULU-NATAL, SOUTH AFRICA","authors":"S. A. Harris, D. Cyrus","doi":"10.1080/10183469.1997.9631388","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631388","url":null,"abstract":"Summary The present study examined the composition, abundance and seasonality of fish larvae occurring in Richards Bay Harbour, over an 18-month period from June 1991 to November 1992. Ichthyoplankton samples were collected every six weeks at top, mid and bottom depths in the dredged channel 100 to 200 m from the harbour entrance. A total of 7 163 fish larvae, representing 105 taxa and 53 families, was collected throughout the study period. The dominant families were the Engraulidae and Gobiidae representing 50% and 37% of the total catch, respectively. The most abundant larvae were those of the thorny anchovy, Stolephorus holodon, and an unidentified goby, Gobiid 12 (32% and 30% of the total catch, respectively). Estuarine-associated taxa dominated the total catch in terms of density (61%), with 11 out of the 28 taxa being totally dependent on estuaries at some stage in their life cycle. Turbidity and temperature were significant variables accounting for 27% of the variation in larval densities of estuar...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116271813","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: 18
MASS MORTALITY OF MARINE AND ESTUARINE FISH IN THE SWARTVLEI AND WILDERNESS LAKE SYSTEMS, SOUTHERN CAPE. 南开普斯瓦特雷和荒野湖泊系统中海洋和河口鱼类的大量死亡。
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1994.9631353
I. Russell
{"title":"MASS MORTALITY OF MARINE AND ESTUARINE FISH IN THE SWARTVLEI AND WILDERNESS LAKE SYSTEMS, SOUTHERN CAPE.","authors":"I. Russell","doi":"10.1080/10183469.1994.9631353","DOIUrl":"https://doi.org/10.1080/10183469.1994.9631353","url":null,"abstract":"Summary Two incidences of mass mortality of fish were recorded in two saline waterbodies (Swartvlei estuary and Rondevlei) in the Wilderness National Park. Species affected were the Knysna seahorse (Hippocampus capensis) and longsnout pipefish (Syngnathus acus) in the Swartvlei estuary, and Cape stumpnose (Rhabdosargus holubi) and white steenbras (Lithognathus lithognathus) in Rondevlei. Comparison of water quality parameters during fish mortalities to past ranges and reported species tolerances indicated that the probable causes for the mortalities were high water temperature in the Swartvlei estuary, and low dissolved oxygen concentration in Rondevlei.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125559027","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: 41
SOME OBSERVATIONS ON FISH MIGRATIONS IN CAPRIVI, NAMIBIA 纳米比亚卡普里维鱼类洄游的一些观察
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1996.9631373
B. V. D. Waal
{"title":"SOME OBSERVATIONS ON FISH MIGRATIONS IN CAPRIVI, NAMIBIA","authors":"B. V. D. Waal","doi":"10.1080/10183469.1996.9631373","DOIUrl":"https://doi.org/10.1080/10183469.1996.9631373","url":null,"abstract":"Summary Longitudinal and lateral migrations of freshwater fish were observed in 63 (83%) of the fish of the Upper Zambezi in the Caprivi region, Namibia. The results of 20 surveys showed that longitudinal upstream migrations were undertaken by most small cyprinids, mormyrids, distichodontids, characids, schilbeids, clariids and mochokids but by only a few of the larger cichlids. Similarly, lateral migrations out of permanent waters were common for young mormyrids, some smaller barbs, small characids, Schilbe, a few mochokids, cyprinodonts, most cichlid species and both anabantids. Breeding migrations were observed only in Clariasspp and some barbs. All other fish movements seem to be connected with invasions into newly inundated habitat, escape from desiccation, movement back to permanent water or else an upstream or downstream movement away from areas with temporary high densities in an effort to escape predation or seek new feeding ground. An unexpected large number offish species (34) were collected in...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116079149","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
A NOTE ON THE REINTRODUCTION OF BARBUS TREURENSIS GROENEWALD 1958 (PISCES: CYPRINIDAE) INTO TIIE TREUR RIVER, MPUMALANGA, SOUTH AFRICA. 关于1958年在南非普马兰加省特鲁尔河重新引入barbus treurensis greenewald(双鱼座:鲤科)的说明。
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631421
J. Engelbrecht, F. Roux
{"title":"A NOTE ON THE REINTRODUCTION OF BARBUS TREURENSIS GROENEWALD 1958 (PISCES: CYPRINIDAE) INTO TIIE TREUR RIVER, MPUMALANGA, SOUTH AFRICA.","authors":"J. Engelbrecht, F. Roux","doi":"10.1080/10183469.1998.9631421","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631421","url":null,"abstract":"Summary The Treur River Barb (Barbus treurensis) was reintroduced into the Treur River after being extinct in this river for about twenty years. During March 1995, 504 individuals were released at a carefully selected site. Recent surveys have shown that, within only five years, Barbus treurensis has successfully repopulated about seven kilometres of the Treur River.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114813842","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: 3
RELATIVELY NEGATIVE δ13C RATIOS OF MESOZOOPLANKTON IN THE SUNDAYS RIVER ESTUARY, COMMENTS ON POTENTIAL CARBON SOURCES 周日河河口中浮游动物δ13c比值相对负，对潜在碳源的评述
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1995.9631363
H. Jerling, T. Wooldridge
{"title":"RELATIVELY NEGATIVE δ13C RATIOS OF MESOZOOPLANKTON IN THE SUNDAYS RIVER ESTUARY, COMMENTS ON POTENTIAL CARBON SOURCES","authors":"H. Jerling, T. Wooldridge","doi":"10.1080/10183469.1995.9631363","DOIUrl":"https://doi.org/10.1080/10183469.1995.9631363","url":null,"abstract":"Summary Mesozooplankton, submergent and fringing macrophytes and particles suspended in the water column in the Sundays River estuary South Africa were analyzed for δ13C isotope ratios. Highly negative values (−28.3‰ to −32.0‰) for the mesozooplankton species suggest the possibility of phytoplankton rather than detritus derived from macrophytes as carbon source.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123985626","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: 22
Fish trapping during the operation of the Durban harbour graving dock, South Africa 南非德班港码头作业期间的捕鱼作业
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1995.9631364
L. Beckley, R. Elst, S. Chater, S. Birnie
{"title":"Fish trapping during the operation of the Durban harbour graving dock, South Africa","authors":"L. Beckley, R. Elst, S. Chater, S. Birnie","doi":"10.1080/10183469.1995.9631364","DOIUrl":"https://doi.org/10.1080/10183469.1995.9631364","url":null,"abstract":"Summary The species composition and abundance of fishes trapped on the grids covering the drainage outlets in the Durban harbour graving dock were investigated over a 12 month period. Fifty-three species of fish and several invertebrates, including the crabs Scyllaserrata and Portunus pelagicus, prawns Penaeus spp. and crayfish Palinurus spp., were caught on the grids. Shoaling fishes of the families Clupeidae and Mugilidae were numerically dominant with Haemulidae, Sparidae and Monodactylidae other major components. The economic value of the captured fishes to dockyard workers and possible mechanisms to reduce catches are discussed.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"266 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114160650","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
A REVIEW OF THE ICHTHYOFAUNA OF THE MHLATHUZE ESTUARY 文章标题mhlathuze河口鱼类区系综述
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631416
S. Weerts, D. Cyrus
{"title":"A REVIEW OF THE ICHTHYOFAUNA OF THE MHLATHUZE ESTUARY","authors":"S. Weerts, D. Cyrus","doi":"10.1080/10183469.1998.9631416","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631416","url":null,"abstract":"Summary The fish fauna of the Mhlathuze estuary was reviewed making reference to surveys dating from 1948 to 1997. The concept of Estuarine Dependence Category was employed to describe species affinities with the marine, estuarine and freshwater environments. At least 121 species of fish from 49 families have been recorded from the estuary in the referenced data. Marine-spawning estuarine dependants dominated species numbers. Estuarine spawning species historically contributed about twelve percent of the species present but more recently their contribution to species numbers has nearly doubled. Thirteen species recorded are southern African endemics and six are listed as having special conservation status. The estuary's importance to juveniles of marine-spawning fish species that utilise estuaries is considered of regional and national significance. Estuarine and marine-spawning species have historically dominated species numbers in the lower Mhlathuze River and associated coastal lakes. The role of the e...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116757446","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: 6
SALINITY, FLOODS AND THE INFAUNAL MACROBENTHIC COMMUNITY OF THE ST LUCIA ESTUARY, KWAZULU-NATAL, SOUTH AFRICA 南非夸祖鲁-纳塔尔省圣卢西亚河口的盐度、洪水和大型底栖动物群落
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631385
R. Owen, A. Forbes
{"title":"SALINITY, FLOODS AND THE INFAUNAL MACROBENTHIC COMMUNITY OF THE ST LUCIA ESTUARY, KWAZULU-NATAL, SOUTH AFRICA","authors":"R. Owen, A. Forbes","doi":"10.1080/10183469.1997.9631385","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631385","url":null,"abstract":"Summary The St Lucia estuary and lake comprise some 80 % of the estuarine area of KwaZulu-Natal. The system is subject to floods and hypersaline conditions, the latter twice exceeding 100 since 1970. The lake is connected to the sea by a meandering tidal channel called the Narrows, which historically has been largely overlooked in terms of benthic research in favour of the lake. Changes in the macrobenthic infauna of the Narrows were investigated over an eleven year period during which the Narrows was exposed to unprecedented cyclonic flooding in February 1984, floods in October 1987, a net freshwater outflow following heavy seasonal rainfall in November 1989, and a period of hypersalinity following mouth closure between December 1992 and September 1993. Although the benthos was generally numerically and gravimetrically dominated by the crab Paratylodiplax blephariskios, significant changes in species composition and densities were recorded after the cyclonic flooding in 1984, during the net fresh water o...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126640595","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: 37
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