Ichthyofaunal characteristics of a typical temporarily open/closed estuary on the southeast coast of South Africa
- Cowley, Paul D, Heemstra, Phillip C
- Authors: Cowley, Paul D , Heemstra, Phillip C
- Date: 2001
- Subjects: Estuarine fishes -- Ecology -- Indian Ocean , Estuarine ecology -- South Africa , Fish communities -- South Africa , Fish communities -- Indian Ocean
- Language: English
- Type: Text
- Identifier: vital:15021 , http://hdl.handle.net/10962/d1019862 , ISSN 0073-4381 , Ichthyological Bulletin J.L.B. Smith Institute of Ichthyology; No. 71
- Description: The present study was undertaken to describe the species composition, size composition and distribution of the fish fauna associated with the temporarily open/closed East Kleinemonde Estuary on the southeast coast of South Africa. Data collected on the estuary mouth condition from March 1993 to August 1997 indicated that this system was predominantly closed, while open mouth conditions were unseasonal and prevailed for only a short duration following periods of high rainfall. Fishes were sampled throughout the estuary between April 1993 and January 1997 using seine and gill nets. A total of 30 species belonging to 17 families were recorded, including the critically endangered estuarine pipefish Syngnathus watermeyeri. Besides the estuarine pipefish, an additional five species capable of completing their life cycle within the estuary were recorded. The ichthyofaunal community was dominated by 18 marine-spawning species with varying degrees of dependence on estuaries as nursery areas. The marine species that are not dependent on estuaries as nursery areas were represented by three species, while the euryhaline freshwater species, obligate catadromous species and facultative catadromous species were each represented by one species. The dominant members of the estuarine-spawning group were well represented by all post-larval life-history stages, whereas the mean size of each marine-spawning species indicated that juvenile size classes dominated this group. Classification and ordination of both the small- and large-mesh seine net fish assemblages revealed a high degree of similarity throughout the estuary, with the exception of a distinct grouping associated with sandy substrata in the lower reaches of the system. Catch per unit effort (CPUE) data provided evidence of spatial segregation by several species as well as within some families (e.g. Gobiidae). , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 2001
- Authors: Cowley, Paul D , Heemstra, Phillip C
- Date: 2001
- Subjects: Estuarine fishes -- Ecology -- Indian Ocean , Estuarine ecology -- South Africa , Fish communities -- South Africa , Fish communities -- Indian Ocean
- Language: English
- Type: Text
- Identifier: vital:15021 , http://hdl.handle.net/10962/d1019862 , ISSN 0073-4381 , Ichthyological Bulletin J.L.B. Smith Institute of Ichthyology; No. 71
- Description: The present study was undertaken to describe the species composition, size composition and distribution of the fish fauna associated with the temporarily open/closed East Kleinemonde Estuary on the southeast coast of South Africa. Data collected on the estuary mouth condition from March 1993 to August 1997 indicated that this system was predominantly closed, while open mouth conditions were unseasonal and prevailed for only a short duration following periods of high rainfall. Fishes were sampled throughout the estuary between April 1993 and January 1997 using seine and gill nets. A total of 30 species belonging to 17 families were recorded, including the critically endangered estuarine pipefish Syngnathus watermeyeri. Besides the estuarine pipefish, an additional five species capable of completing their life cycle within the estuary were recorded. The ichthyofaunal community was dominated by 18 marine-spawning species with varying degrees of dependence on estuaries as nursery areas. The marine species that are not dependent on estuaries as nursery areas were represented by three species, while the euryhaline freshwater species, obligate catadromous species and facultative catadromous species were each represented by one species. The dominant members of the estuarine-spawning group were well represented by all post-larval life-history stages, whereas the mean size of each marine-spawning species indicated that juvenile size classes dominated this group. Classification and ordination of both the small- and large-mesh seine net fish assemblages revealed a high degree of similarity throughout the estuary, with the exception of a distinct grouping associated with sandy substrata in the lower reaches of the system. Catch per unit effort (CPUE) data provided evidence of spatial segregation by several species as well as within some families (e.g. Gobiidae). , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 2001
A review of the species of the genus Neobythites (Pisces: Ophidiidae) from the Western Indian Ocean, with a description of seven new species
- Authors: Nielsen, Jørgen G
- Date: 1995
- Language: English
- Type: Text
- Identifier: vital:15024 , http://hdl.handle.net/10962/d1019887 , ISBN 0-86810-281-4 , Ichthyological Bulletin J.L.B. Smith Institute of Ichthyology; No. 62
- Description: Species of the ophidiid genus Neobythites from the western Indian Ocean are revised based on 225 specimens. The majority of specimens came from the 17th cruise (1988-89) of the Soviet R/V VITYAZ. Twelve species are recognized: N. analis Barnard, 1927 (southern Africa; lectotype designed), N. crosnieri sp.n. (Madagascar), N. kenyaensis sp.n, (east coast of Africa), N. malhaensis sp.n. (Saya de Malha Bank), N. meteori sp.n. (Socotra Id.), N. multistriatus Nielsen and Quero, 1991 (Reunion and Rodrigues Islands), N. natalensis sp.n. (South Africa and Madagascar), N. somaliaensis sp.n. (Somalia), N. steatiticus Alcock, 1893 (northern Indian Ocean), N. stefanovi Nielsen and Uiblein, 1993 (Red Sea to Gulf of Oman), N. trifilis Kotthaus, 1979 (Socotra Id.), N. vityazi sp.n. (Madagascar). All 12 species are illustrated, and a key is included. This paper is the first part of a revision of the genus Neobythites. A second and third part will treat the species from the East Indian/Pacific Oceans and the Atlantic Ocean. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1995
- Authors: Nielsen, Jørgen G
- Date: 1995
- Language: English
- Type: Text
- Identifier: vital:15024 , http://hdl.handle.net/10962/d1019887 , ISBN 0-86810-281-4 , Ichthyological Bulletin J.L.B. Smith Institute of Ichthyology; No. 62
- Description: Species of the ophidiid genus Neobythites from the western Indian Ocean are revised based on 225 specimens. The majority of specimens came from the 17th cruise (1988-89) of the Soviet R/V VITYAZ. Twelve species are recognized: N. analis Barnard, 1927 (southern Africa; lectotype designed), N. crosnieri sp.n. (Madagascar), N. kenyaensis sp.n, (east coast of Africa), N. malhaensis sp.n. (Saya de Malha Bank), N. meteori sp.n. (Socotra Id.), N. multistriatus Nielsen and Quero, 1991 (Reunion and Rodrigues Islands), N. natalensis sp.n. (South Africa and Madagascar), N. somaliaensis sp.n. (Somalia), N. steatiticus Alcock, 1893 (northern Indian Ocean), N. stefanovi Nielsen and Uiblein, 1993 (Red Sea to Gulf of Oman), N. trifilis Kotthaus, 1979 (Socotra Id.), N. vityazi sp.n. (Madagascar). All 12 species are illustrated, and a key is included. This paper is the first part of a revision of the genus Neobythites. A second and third part will treat the species from the East Indian/Pacific Oceans and the Atlantic Ocean. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1995
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