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GOBIID FISHES OF THE GENUS GLOSSOGOBIUS IN THE LIMPOPO SYSTEM: A FIRST RECORD AND A RANGE EXTENSION OF G. CALLIDUS (SMITH, 1937) 林波波河系舌鱼属的戈biid鱼:第一次记录和g. callidus的范围扩展(smith, 1937)
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1994.9631352
P. Greenwood
{"title":"GOBIID FISHES OF THE GENUS GLOSSOGOBIUS IN THE LIMPOPO SYSTEM: A FIRST RECORD AND A RANGE EXTENSION OF G. CALLIDUS (SMITH, 1937)","authors":"P. Greenwood","doi":"10.1080/10183469.1994.9631352","DOIUrl":"https://doi.org/10.1080/10183469.1994.9631352","url":null,"abstract":"Summary Recently, a specimen of Glossogobius callidus was collected in the Marico Oog, a major source of the Limpopo River in the western Transvaal. This locality is some 1500 km from the river mouth. Earlier taxonomic confusion of Glossogobius giuris and G. callidus has resulted in the omission of G. callidus from identification keys published before 1979. As a result, that species has not been recorded from the Limpopo system. A previously published record of G. giuris from that system, at a locality about 950 km from the sea, is now shown to be based on a misidentification of G. callidus specimens.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"13 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":"126046954","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: 8
SOME ASPECTS OF THE REPRODUCTION BIOLOGY OF LABEO CAPENSIS (SMITH, 1941) (PISCES, CYPRINIDAE) IN RELATION TO EXPLOITATION AND EXTREME ENVIRONMENTAL CONDITIONS IN HARDAP DAM, NAMIBIA 在纳米比亚hardap坝的开发和极端环境条件下，labeo capensis (smith, 1941)(双鱼座，鲤科)繁殖生物学的一些方面
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1995.9631365
B. V. Zyl, C. Hay, G. Steyn
{"title":"SOME ASPECTS OF THE REPRODUCTION BIOLOGY OF LABEO CAPENSIS (SMITH, 1941) (PISCES, CYPRINIDAE) IN RELATION TO EXPLOITATION AND EXTREME ENVIRONMENTAL CONDITIONS IN HARDAP DAM, NAMIBIA","authors":"B. V. Zyl, C. Hay, G. Steyn","doi":"10.1080/10183469.1995.9631365","DOIUrl":"https://doi.org/10.1080/10183469.1995.9631365","url":null,"abstract":"Summary The sex ratio of Labeo capensisdid not differ significantly at a 95% confidence level from a 1♂:1♀, ratio during the study period. The smallest sexually mature male and female L. capensis were 20 cm and 21 cm FL, respectively. Fifty percent of the males matured at 23 cm FL whereas females matured at 26 cm FL. In large ripe females (> 38 cm FL) the ovaries were as much as 15% of body mass. The males and females are two to three years old when they reach the minimum length at maturity. A linear relationship between fish mass and fecundity was obtained. The gonads of the males and females started enlarging during August, reached a peak during December to January and gradually decreased in size by February. Water temperature correlates with the development of the gonads in both male and female L. capensis, and the decrease in gonado-somatic index shows that spawning is not dependent on flooding.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"3 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":"129767685","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: 8
INFLUENCE OF FRESHWATER FLOW REGIME ON FISH ASSEMBLAGES IN THE GREAT FISH RIVER AND ESTUARY 大鱼河及河口淡水流态对鱼类群落的影响
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1996.9631372
L. D. T. Morshuizen, A. Whitfield, A. Paterson
{"title":"INFLUENCE OF FRESHWATER FLOW REGIME ON FISH ASSEMBLAGES IN THE GREAT FISH RIVER AND ESTUARY","authors":"L. D. T. Morshuizen, A. Whitfield, A. Paterson","doi":"10.1080/10183469.1996.9631372","DOIUrl":"https://doi.org/10.1080/10183469.1996.9631372","url":null,"abstract":"Summary Two and a half years of data were collected from the lower Great Fish River, head region and estuary to determine the fish species composition within these areas. Gilchristella aestuaria, Liza dumerilii, Rhabdosargus holubi and Pomadasys commersonnii were the four most abundant species captured, with riverine flow rate having an important effect on both species composition and numbers of fishes in the different regions. Most marine species displayed a strong inverse relationship between catch per unit effort and elevated freshwater inputs. Euryhaline marine species dominated the catches at all sampling sites during low flows but were less common during high flow periods when catadromous species were most abundant. Based on the available evidence it is suggested that for most marine species in the river this decline in abundance is related to low conductivity levels following floods rather than avoidance of elevated flows. The impact of elevated suspensoid concentrations and lowered dissolved oxyge...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"48 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":"121730575","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: 46
GENETIC VARIATION BETWEEN FOUR WHITEFISH BARBUS ANDREWI (PISCES: CYPRINI-DAE) POPULATIONS AND POSSIBLE IMPLICATIONS FOR CONSERVATION MANAGEMENT 四种白鱼(双鱼座:鲤科)种群的遗传变异及其可能的保护管理意义
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631407
N. Impson, P. Bloomer
{"title":"GENETIC VARIATION BETWEEN FOUR WHITEFISH BARBUS ANDREWI (PISCES: CYPRINI-DAE) POPULATIONS AND POSSIBLE IMPLICATIONS FOR CONSERVATION MANAGEMENT","authors":"N. Impson, P. Bloomer","doi":"10.1080/10183469.1998.9631407","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631407","url":null,"abstract":"Summary The endemic whitefish, Barbus andrewi, from the Western Cape Province of South Africa is threatened due to the impacts of predatory alien fishes and unsustainable use of its riverine habitat. A study was undertaken to determine the extent of genetic variation among Berg and Breede River populations. Genetic considerations could determine management actions to ensure the long-term survival of this vulnerable species. Sequences of the mitochondrial DNA (mtDNA) cytochrome b gene of two Berg River and 11 Breede River fish from three relatively isolated populations of B. andrewi showed low levels of variation. The two maternal lineages present in the Berg River specimens were also found in the Breede River specimens indicating that B. andrewi from the two river systems share a recent common ancestry. Data from the investigation suggest that fish from the Breede River, in particular from the abundant Brandvlei Dam population, can be used for restocking the depleted Berg River population. Other considera...","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":"115026715","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
CHANGES IN THE BENTHIC FAUNA OF LAKE CHIVERO, ZIMBABWE, OVER THIRTY YEARS 三十年来津巴布韦奇维罗湖底栖动物的变化
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1995.9631359
B. Marshall
{"title":"CHANGES IN THE BENTHIC FAUNA OF LAKE CHIVERO, ZIMBABWE, OVER THIRTY YEARS","authors":"B. Marshall","doi":"10.1080/10183469.1995.9631359","DOIUrl":"https://doi.org/10.1080/10183469.1995.9631359","url":null,"abstract":"Summary Lake Chivero is a eutrophic Zimbabwean reservoir and data on its benthic fauna are available over a period of about thirty years. The levels of organic carbon are higher than in many other southern African reservoirs but have not increased since 1974. The numbers of chironomid larvae appeared to have decreased but this was a consequence of the very low level of the lake at the time of sampling. Other changes included a decrease in the number of mussels but a large increase in the population of prosobranch snails. This may be a consequence of both the lake's eutrophic state and a three-fold increase in calcium in the lake's water over the last twenty years.","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":"115161640","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
THE BARRED MINNOWS (TELEOSTEI: CYPRINIDAE) OF ZIMBABWE: IS THERE CAUSE FOR CONCERN? 津巴布韦的横斑鲦鱼(铁骨鱼科):有什么值得关注的吗?
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631422
B. Marshall, B. Gratwicke
{"title":"THE BARRED MINNOWS (TELEOSTEI: CYPRINIDAE) OF ZIMBABWE: IS THERE CAUSE FOR CONCERN?","authors":"B. Marshall, B. Gratwicke","doi":"10.1080/10183469.1998.9631422","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631422","url":null,"abstract":"Summary Two species of barred minnow, Opsaridium zambezense and O. peringueyi, occur in Zimbabwe. The former is widely distributed in the Zambezi basin and some other rivers but is now absent from Lake Kariba and possibly some of its tributaries. The latter, which was only recently recognised as a distinct species and admitted to the Zimbabwean list, is much scarcer. It occurs in the Save and Limpopo catchments and there are only four specimens in the Natural History Museum of Zimbabwe collection. These specimens are all more than 40 years old and the lack of more recent ones suggest that O. peringueyi may be extinct, or close to extinction, in Zimbabwe. This situation may have come about through habitat alteration and drought, and emphasises the need for further monitoring of the current occurrence/distribution of fish species in the country.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"22 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":"127884321","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: 9
DUNE MINING AND THE NHLABANE SYSTEM: CAN BIODIVERSITY AND THE NURSERY FUNCTION BE MAINTAINED? 沙丘开采与nhlabane系统:生物多样性和苗圃功能能否保持?
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631391
D. Cyrus, V. Wepener
{"title":"DUNE MINING AND THE NHLABANE SYSTEM: CAN BIODIVERSITY AND THE NURSERY FUNCTION BE MAINTAINED?","authors":"D. Cyrus, V. Wepener","doi":"10.1080/10183469.1997.9631391","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631391","url":null,"abstract":"Summary A four year study of the Nhlabane Estuary and Lake System was undertaken over the period 1992 to 1995. Data gathered clearly showed that in terms of ichthyofauna, the estuary plays an important role as a nursery ground for juveniles of marine species known to be dependent or partially dependent on these systems. The benthos was found to be typically estuarine in nature. During the study period all positive and/or negative aspects associated with mining activities in the vicinity of the Nhlabane System were recorded. In addition the effects of the prolonged drought over 1993–95, and that of the presence of a permanent barrage separating the estuary from the lake were also noted. A number of mining associated activities have had negative impacts on the system. These were related to the presence of the barrier between the estuary and the lake (the barrage), continued abstraction of water by Richards Bay Minerals (RBM) from the estuary itself and the effects of an RBM dredger and plant machinery cross...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"18 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":"131055469","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
COMPARISON OF FISH GONADS AND FISH MEAL AS MAJOR COMPONENTS IN THE DIETS OF YOUNG AFRICAN SHARPTOOTH CATFISH, CLARIAS GARIEPINUS (BURCHELL) 幼年非洲尖牙鲶鱼(clarias gariepinus, burchell)鱼腺和鱼粉作为主要成分的比较
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1994.9631351
L. Hoffman, J. F. Prinsloo, J. Theron
{"title":"COMPARISON OF FISH GONADS AND FISH MEAL AS MAJOR COMPONENTS IN THE DIETS OF YOUNG AFRICAN SHARPTOOTH CATFISH, CLARIAS GARIEPINUS (BURCHELL)","authors":"L. Hoffman, J. F. Prinsloo, J. Theron","doi":"10.1080/10183469.1994.9631351","DOIUrl":"https://doi.org/10.1080/10183469.1994.9631351","url":null,"abstract":"Summary The replacement of fish-meal (two sources, arbitrarily designated FMA and FMB), with either freeze dried (GVD) or oven dried (GOD) gonads of Clarias gariepinus in a starter diet for larvae of this species, was tested. No significant difference in larval growth rates was noted between the various protein sources, although fish receiving FMA had a significantly lower final body weight (p ≤ 0.05). Fish which received gonads as a protein source had a significantly higher total body lipid (GOD = 28.47% Dry Mass—DM) than those receiving fish-meal (FMA = 13.97% DM). The whole body fatty acid composition was influenced by that of the fatty acid composition of the protein source. The hepatocytes of the fish receiving the gonads as protein source showed 100% lipid accumulation and degenerative changes, whilst those from fish-meal fed fish showed none.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"31 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":"132685803","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: 1
A comparison of allozyme heterozygosity and life history variables in four strains of african catfish (clarias gariepinus) 四种非洲鲶鱼同工酶杂合性及生活史变量的比较
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631386
J. P. Grobler, L. Hoffman, J. F. Prinsloo
{"title":"A comparison of allozyme heterozygosity and life history variables in four strains of african catfish (clarias gariepinus)","authors":"J. P. Grobler, L. Hoffman, J. F. Prinsloo","doi":"10.1080/10183469.1997.9631386","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631386","url":null,"abstract":"Summary We studied allozyme polymorphism and its relation to morphological characteristics in 122 individuals from four lines of African catfish. Starch gel electrophoresis was used to screen 26 loci, of which five were polymorphic. Average heterozygosity levels differed moderately among lines (range 4–6.3 %) and were closely related to the management histories of the populations studied. Significant differences between the allelic frequencies of strains were found at all polymorphic loci, and gene products of glucose-6-phosphate isomerase (E.C. 5.3.1.9) proved particularly suitable for differentiation among the four strains studied. There was little evidence for linkage between heterozygosity values and specific quantitative morphological characteristics. However, a significant positive correlation between heterozygosity and variation within the morphological parameters involved was found in several instances.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"30 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":"132764643","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: 7
A NOTE ON THE UNUSUAL CRUSTACEAN COMMUNITY OF A TEMPORARY POOL IN THE NORTHERN CAPE 关于北开普省一个临时池塘里不寻常的甲壳类动物群落的笔记
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1996.9631376
M. Hamer, N. Rayner
{"title":"A NOTE ON THE UNUSUAL CRUSTACEAN COMMUNITY OF A TEMPORARY POOL IN THE NORTHERN CAPE","authors":"M. Hamer, N. Rayner","doi":"10.1080/10183469.1996.9631376","DOIUrl":"https://doi.org/10.1080/10183469.1996.9631376","url":null,"abstract":"Summary A temporary pool in a dry stream bed traversing Grootvloer Pan in the Northern Cape was inhabited by fifteen branchiopod and calanoid copepod crustacean species. There was an unusually high number of congeneric species in the pool; in the class Branchiopoda, five Streptocephalus species and four Daphnia species were collected. In addition, two species of the calanoid genus Metadiaptomus were identified. The high species richness was not related to habitat diversity, pool size or difference in body size of each species. Three species (Streptocephalus purcelli, S. gracilis and Metadiaptomus capensis) had previously been collected only from the winter-rainfall areas of the Cape. Episodic flooding in the Northern Cape in 1988 may have resulted in the unusual community in the Grootvloer temporary pool.","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":"115809046","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
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