Movements of some indigenous riverine fish in Sri Lanka

Silva, E. I. L.; Davies, Ronald W.

doi:10.1007/bf00004240

Cited by 19 publications

(16 citation statements)

References 8 publications

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“…1) fed by two different tributaries (Silva & Davies, 1986a, 1986b. The calculated lake areas (Table 1) are substantially different from those previously published (De Silva, 1985;Maitipe & De Silva, 1985) which has resulted in De Silva (1985) mis-estimating the areal basis fish production.…”

Section: Resultscontrasting

confidence: 50%

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The seasonality of monsoonal primary productivity in Sri Lanka

Silva

Davies

1987

Hydrobiologia

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The relationship between phytoplankton primary production and seasonality of physico-chemical parameters were examined for five man-made lakes in the dry-zone of Sri Lanka. Sri Lanka experiences two monsoons dividing the year into four meteorological seasons: -the North East (October-December) and South West (April-June) monsoons and the two inter-monsoons. A significant log linear relationship was found between Secchi disc depth and the depth of the euphotic zone which was lowest during the NE monsoon. Maximum mean photosynthetic rate ranged from 0.935 t-0.067 SE to 0.479 mg 021-I h-I k 0.115. Gross primary productivity which ranged from 0.378 g 0, m-2 h-I in the NE monsoon to 0.980 g O2 rn-, h-' in the SW monsoon showed significant season variation. This is shown to be determined either directly or indirectly by the light regime.

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Section: Resultscontrasting

confidence: 50%

“…The five reservoirs (Parakrama Samudra, Minneriya, Giritale, Kaudulla, and Pimburettewa ( Fig. 1)) are described by Silva & Davies (1986a, 1986b.…”

Section: Methodsmentioning

confidence: 99%

The seasonality of monsoonal primary productivity in Sri Lanka

Silva

Davies

1987

Hydrobiologia

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“…The term ''transitory'' is used to describe this assemblage implying that the fish could also occupy the lowland reaches (Rainboth, 1996;Kottelat, 1998), where the lentic cyprinids and other limnophilic fishes dominate, i.e., lowland species (Allouche, 2002;Beamish et al, 2006). However, upstream movement of these lowland species is sometimes observed especially for reproduction (Silva & Davies, 1986;Ferreira & Petrere, 2009;Tongnunui & Beamish, 2009). This phenomenon supports the pattern of species addition for the shifting in species composition (Huet, 1959;Petry & Schulz, 2006).…”

Section: Discussionmentioning

confidence: 98%

Fish diversity and assemblage patterns along the longitudinal gradient of a tropical river in the Indo-Burma hotspot region (Ping-Wang River Basin, Thailand)

et al. 2012

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The relationships between environmental variables as descriptors to the fish community, in terms of species diversity indices, and the fish assemblage patterns along the longitudinal gradient in a rhitral environment of a large river system located in the Indo-Burma hot spot (Ping-Wang River Basin) were studied. Fish data and water quality parameters were collected between January 1996 and April 2009. The three most diverse families were Cyprinidae, Balitoridae, and Cobitidae, respectively. Three physicochemical parameters (i.e., DO, water temperature, and pH) and three geo-morphological parameters (i.e., altitude, distance from the sea, and discharge) showed statistically significant to diversity parameters (P value \0.05). The classification and regression trees showed that the geo-morphological parameters were more significant in predicting both species richness and Shannon diversity index than the physicochemical parameters, in which altitude was the most significant. Fish assemblages in the Ping-Wang River Basin were classified into four patterns viz., mountainous, piedmont, transitory, and lowland species.

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“…With the exception of two widely distributed species of Anguilla, significant obligatory intra-basin migration in the Sri Lankan freshwater fishes is unknown, although Silva & Davies (1986) observed upstream spawning migrations from lowland standing waters in nine fish species, none of them considered endangered or vulnerable. With the exception of the Mahaweli River Project, most diversion and impoundment schemes up to now have affected only the upper regions of major basins and relatively minor dry zone basins.…”

Section: Hydrological Alterationsmentioning

confidence: 99%

Threats to the indigenous freshwater fishes of Sri Lanka and remarks on their conservation

Pethiyagoda¹

1994

Hydrobiologia

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Sixty-two freshwater dispersant (26 endemic), 26 saltwater dispersant and 20 exotic fishes have been recorded from Sri Lanka's inland waters. The discovery of nine new species of freshwater fish during the past decade suggests that Sri Lanka's fish fauna is not yet well known and that further discoveries can be expected. All the new species, and almost all the endemic ones, have been recorded from forested areas in the foothills of the southwestern wet zone and the Knuckles hills. The known ranges of many species are exceedingly small; almost all of them are habitat specialists. 25 species have at least two strong habitat preferences (in almost all case, shade being one), though a majority (32 species) have none. Habitat alteration is therefore the greatest threat to their survival.Eight freshwater fish species are considered endangered and a further five, vulnerable. Three species are rare, 18 common and 13 abundant. All but two of the endangered species and all the vulnerable species are endemic in Sri Lanka. Nine species are each restricted to only one drainage basin, and seven have a known range < 50 km 2 . Three species of diadromous gobies known only from small populations are considered vulnerable.Examination of the existing threats suggest that deforestation, the widespread dispersion of exotics, pollution caused by agricultural chemicals and increasing pressure from the food fishery present the greatest threats to fish populations. While the endemic fishes are restricted to or most abundant in the wet zone, the overwhelming extent (> 95 %) of Sri Lanka's nature reserve areas are in the dry zone. A programme to maintain self-sustaining captive populations of the endangered species is urgently necessary.

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Movements of some indigenous riverine fish in Sri Lanka

Cited by 19 publications

References 8 publications

The seasonality of monsoonal primary productivity in Sri Lanka

The seasonality of monsoonal primary productivity in Sri Lanka

Fish diversity and assemblage patterns along the longitudinal gradient of a tropical river in the Indo-Burma hotspot region (Ping-Wang River Basin, Thailand)

Threats to the indigenous freshwater fishes of Sri Lanka and remarks on their conservation

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