Salinity ranges of some southern African fish species occurring in estuaries

Whitfield, A.K.; Blaber, S. J. M.; Cyrus, D. P.

doi:10.1080/02541858.1981.11447750

Cited by 84 publications

(63 citation statements)

References 16 publications

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“…Salinity is considered to be one of the most important variables controlling fish distribution patterns in estuaries, as the ability to cope with fluctuations in the variable is the most essential adaptation by fish penetrating these environments (Pannikkar 1960, Whitfield et al 1981. Indeed, fishes frequenting estuaries around the world are generally classified on the basis of their origin and salinity tolerances (e.g.…”

Section: Other Variablesmentioning

confidence: 99%

Factors affecting spatial variability in seine net catches of fish in the surf zone of False Bay, South Africa

Bm¹,

Ba²,

Sj³

1996

Mar. Ecol. Prog. Ser.

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Ichthyofaunal assemblages at 11 surf zone localities along the perimeter of False Bay South Afnca were sampled by seine netting at monthly intervals between July 1991 and J u n e 1993 Sampllng localit~es were selected to encompass as wide a range of physical vanables as possible incorporatlng sheltered, exposed, sandy and mixed-shore habitats, thus providing a colnprehensive assessment of the factors lnfluenclng surf zone fish assemblages Data collected at each site were averaged over the 2 yr p e i~o d in order to highlight the influence of various physical environnlental vanables on the abundance and co~nmunity structure ot these assemblages Athenr~a brevlceps, Liza rlchardsonii and Rhahdosarg~ls gloh~ceps were numeiically domlnant at all sites together providing between 69 and 99%) of the catches Overall catches of juvenile flsh exceeded that ot adult fish, making up almost 53 of the catch Fish abundance (no ind per 100 m') and number of species recorded at each site ranged from 6 to 199 and from 12 to 31 respectivel) Multivdriate analyses Indicated that the deglee of wave exposure the presencc of emergent rock on the shore dnd turbid~ty were responsible for most of the s p a t~a l vanab~lity in abundance and community structure observed Although of lesser importance abundance of detached macrophytes salinity dnd water temperature also played a role in structuring fish assemblages Species specific preferences for varying combinations of these var~ables are responsible for fluctuations in the structure and overall abundance of assemblages in different a r e a

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Section: Other Variablesmentioning

confidence: 99%

Factors affecting spatial variability in seine net catches of fish in the surf zone of False Bay, South Africa

Bm¹,

Ba²,

Sj³

1996

Mar. Ecol. Prog. Ser.

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“…Since most fish species in estuaries seldom occur in salinities outside their tolerance range (Whitfield et al 1981), it can be assumed that they possess some mechanism for the detection of dissolved mineral salt concentrations. Marais (1988), for example, working in eastern Cape Province and Transkei estuaries found a highly significant (p < 0.001) negative correlation between gill net catches and increasing salinity, i.e.…”

Section: Salinitymentioning

confidence: 99%

Abundance of larval and 0+ juvenile marine fishes in the lower reaches of three southern African estuaries with differing freshwater inputs

Whitfield¹

1994

Mar. Ecol. Prog. Ser.

119

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Although numerous studies have been conducted on the biology and ecology of larval and juvenile marine fishes in estuaries, information on the factors influencing abundance, which in turn reflects the magnitude of immigration into these systems, is generally lacking. In an effort to provide some insight into the posslble role of freshwater discharge on the abundance of marine larval and juvenile fishes, 3 permanently open eastern Cape Province estuaries with similar tidal prisms and mouth dimensions, but differing riverine inputs and turbidity characteristics, were selected as study sites. The Great Fish system can be characterized as a turbid estuary (>50 NTU) with a moderate axial salinity gradient (> 20 g kg-'), the Sundays as a semi-turbid estuary (> 10 NTU) with a strong axial salinity gradient (>30 g kg-'), and the Kariega as a relatively clear estuary (< 10 NTU) with a weak axial salinity gradient (< 10 g kg-'). Although the number of marine fish taxa entering the 3 estuaries was similar (18 to 20 species), Littoral densities of larvae and 0+ juveniles in the lower reaches of the Great Fish (280 ind. 100 m-2) and Sundays (290 ind. 100 m-2) estuaries were significantly (p < 0.01) greater than those in the Kariega system (50 ind. 100 m-'). lchthyoplankton densities in the lower reaches of the 3 estuaries were highest in the Great Fish estuary (13 ind. 100 m-3), followed by the Sundays Estuary (7 ind. 100 m-3) and Kariega Estuary (4 ind. 100 m-3). Regression analyses indicated that several factors were associated wlth the abundance of the early life stages at the ichthyonekton study sites, the most important of which were estuarine axial salinity gradient, water temperature and axial turbidity gradient. The possible significance of these and other associated variables in influencing migration processes into eastern Cape estuaries is discussed.

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“…The distribution of fish depends on the natural food availability, environmental variables and other factors (Whitefield et al, 1981). Despite many studies, little information is available on fish specially SIS abundance inside and outside sanctuary in open water bodies of Bangladesh.…”

Section: Introductionmentioning

confidence: 99%

Natural Food Abundance and SIS Biodiversity of Matshaya Rani Fish Sanctuary

Hasan

Lucky

Hossain

2012

J. Environ. Sci. & Natural Resources

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An investigation was carried out in the Matshaya Rani (fish queen) Fish sanctuary to evaluate the hydrographic status, natural food and SIS (small indigenous species) abundance in the old Brahmaputra River near the BAU campus. There were three treatment sites-inside sanctuary, upstream and downstream of the sanctuary named as treatments T 1 , T 2 and T 3 , respectively. A number of water quality parameters such as temperature ( ) were recorded and were found within the suitable range for natural food and SIS in different treatments. Among all the water quality parameters, only water transparency and depth showed significant difference (P < 0.05) among the treatments. Forty three genera of phytoplankton belonging to Bacillariophyceae (10), Chlorophyceae (22), Cyanophyceae (8), and Euglenophyceae (3) and nine genera of zooplankton were identified belonging to Rotifera (4) and Crustacea (5) in all the treatments. None of plankton group except Cyanophyceae and Rotifera showed significant difference (p < 0.05) among the treatments. Thirty two species of SIS under ten groups were found in different treatments. The highest number of species was found in treatment T 1 (30) followed by T 2 (25) and T 3 (24). The catfishes, loaches and minnows dominated among thirty two species caught from the sampling sites. The highest numbers of species were found in April and May and the least species were found the month of January. Significant inter month and inter site variation (P < 0.05) in numerical abundance of fish observed in the study area. Notable endangered fishes, Kanchan puti-(Puntius conchonius), Balichata (Acanthocobitis botia), Indian torrent catfish-Amblyceps mangois and Chaka-(Chaca chaca) species were only found in Matshaya Rani Fish sanctuary. The natural food abundance and SIS diversity were significantly more in the inside of Matshaya Rani Fish sanctuary than both the upstream and downstream of the sanctuary.

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Salinity ranges of some southern African fish species occurring in estuaries

Cited by 84 publications

References 16 publications

Factors affecting spatial variability in seine net catches of fish in the surf zone of False Bay, South Africa

Factors affecting spatial variability in seine net catches of fish in the surf zone of False Bay, South Africa

Abundance of larval and 0+ juvenile marine fishes in the lower reaches of three southern African estuaries with differing freshwater inputs

Natural Food Abundance and SIS Biodiversity of Matshaya Rani Fish Sanctuary

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