Man-made lakes: ancient heritage and modern biological resource

Fernando, C. H.; Silva, S. S. de

doi:10.1007/978-94-009-6545-4_21

Cited by 19 publications

(13 citation statements)

References 21 publications

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“…Dam construction has and will always continue to be a socio-political issue (McCully 1995;Roy 1999). But dams are rarely or never constructed for fishery purposes per se, although in most developing countries significant artisanal fisheries have developed in the resulting reservoirs and contribute to the nutrition and well being of rural communities in particular (Fernando and De Silva 1984;De Silva 1988;Petrere et al 2002 amongst others).…”

Section: Habitat Changesmentioning

confidence: 97%

“…Amongst the most widespread introductions into Asia have been the tilapias (Family Cichlidae), of which the Nile tilapia (Oreochromis niloticus) was hailed as the aquatic chicken that would make a significant contribution to aquaculture production and would help to alleviate animal protein malnutrition in the region (Smith and Pullin 1984). These introductions have been hailed by some, mainly from fisheries production and aquaculture view points (Fernando 1977;Fernando and De Silva 1984;De Silva 1988;Amarasinghe and De Silva 1999;Dey 2001) but condemned by others for their effects on fish biodiversity (Pethiyagoda 1994;Kottelat and Whitten 1996). Amongst the alleged effects of tilapias on fish diversity, probably the most serious is the disappearance of the endemic species sinarapan (Mistichthys luzonensis) from Lake Buhi, Philippines (Gindelberger 1981).…”

Section: Species Introductionsmentioning

confidence: 97%

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Freshwater finfish biodiversity and conservation: an asian perspective

Nguyen

Silva

2006

Biodivers Conserv

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Aspects on biodiversity and conservation of the ichthyofauna in the Asian region, in comparison to that of Africa, Europe and North America have been relatively less documented. This paper attempts to evaluate the above aspects in the East, and South and Southeast Asia based on available information in the literature. The familial diversity in inland waters in Asia (121 families) is considerably higher than in African and Latin American. Also, the finfish faunal diversity of 21 major river basins in East, and South and Southeast Asian indicate that species diversity is not necessarily related to familial diversity. The fish fauna in the region considered presently is highly diverse with an estimated cumulative total of 7447 species. Amongst the freshwater fishes the dominant groups are cyprinids (Cyprinidae, about 1000 species), loaches (about 400 species) of the families Balitoridae and Cobitiidae, gobids (Gobiidae, 300 species), catfishes (Bagridae, about 100 species), and the Osphronemidae (85 species). In the region, 462 freshwater finfish species are reckoned to be threatened, accounting for 17.5% of the all finfish species in this status in the world. In the region there are 66 species that are critically endangered and/or endangered, of which 32 are cyprinids, 14 of which are endemic to Lake Lanao, Mindano Island, Philippines. The diversity of freshwater fish species in the region was significantly related to the land area of the different countries in the following manner: ln (species ratio) ¼ ln 0:384 (land area in km 2 Þ þ 0:651ðR 2 ¼ 0:628; p < 0:001Þ:In addition, the fish species diversity in the major river basins of the region was also found to be positively related to the basin area: ln (Species richness index) ¼ À0:789 ln (Area) þ 9:368ðR 2 ¼ 0:748; p < 0:001Þ: Based on above relationship, the predicted fish species richness did not necessarily correlate to river basin size, and rivers with small basins were shown to have high indices. The paper also attempts to evaluate the reasons affecting fish species diversity in the region and suggests mitigating measures.

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Section: Habitat Changesmentioning

confidence: 97%

Section: Species Introductionsmentioning

confidence: 97%

Freshwater finfish biodiversity and conservation: an asian perspective

Nguyen

Silva

2006

Biodivers Conserv

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“…The water collected in these reservoirs is used for agricultural purposes, particularly for paddy cultivation during the non-rainy months. These reservoirs are located in a cascading system so that the water is used for agricultural activities to the maximum possible extent (Fernando and De Silva 1984). Sri Lanka is one of the countries with very high usage of fertilizer (IndexMundi 2015).…”

Section: Introductionmentioning

confidence: 99%

Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

Sangakkara¹,

Wijeyaratne

2015

Sri Lanka J. Aquat.

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Diversity and abundance of zooplankton in relation to nitrate-N and total phosphorus levels of 20 minor and medium scale reservoirs in the low country intermediate zone of Sri Lanka were studied in June-October 2013. Total phosphorus content ranged from 0.029 mg L -1 recorded in Wendaruwewa reservoir to 0.529 mg L -1 recorded in Karangamuwa reservoir and Nitrate-N content varied from 1.186 mg L -1 recorded in Adukkane reservoir to 5.625 mg L -1 recorded in Anukkane reservoir indicating that all reservoirs studied are eutrophic. During the present study, a total of 43 species of zooplankton, comprising 31 species of rotifers, 9 species of cladocerans and 3 species of copepods were recorded. Number of zooplankton species in any one reservoir, which ranged from 4 to 13, was significantly correlated with the nitrate-N content (p<0.05). The most widely distributed zooplankton species was Diacyclops nanus, which was present in 15 reservoirs. Abundance of zooplankton ranged from 4 individuals L -1 recorded for Alona monocantha and Chydorus parvus in Wendaruwewa and Metiyagane reservoirs respectively to 1017 individuals L -1 recorded for Filinia terminalis in Galewela reservoir. Margalef index which ranged from 0.532 in Adukkane reservoir to 2.096 in Dewahuwa reservoir, was significantly correlated with nitrate-N content of water (p<0.05). Pielou index ranging from 0.65 in Galewela reservoir to 0.92 in Polpitiya reservoir and Shannon-Weiner index ranging from 0.91 in Munamaldeniya reservoir to 2.13 in Dewahuwa reservoir were not significantly correlated with nitrate-N and total phosphorus levels of water (p>0.05). Keratella quadrata was present only in Anukkane reservoir where the nitrate-N content was the highest and therefore it may be considered as a bio-indicator of high levels of nitrate-N. Eutrophic conditions of theses reservoirs may possibly be due to runoff of nutrients from agricultural fields as these are located in an intense agricultural area. Therefore, it is necessary to take immediate action to control the overuse of inorganic fertilizer in this area so that contamination of water bodies with nutrients can be minimized.

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“…It is therefore conceivable that, although within a population the condition may change with the reproductive status of the population etc., the overall condition of a population is determined by the nutritional value of the material ingested, and that the measure of condition of a population is indicative of the nutritional status of the latter. The reservoirs of Sri Lanka, excepting a very few, are relatively shallow (Arumugam, 1969;Fernando & De Silva, 1984) and it is possible that differential stratification/deposition of material, particularly detritus, on the bottom does not occur, as in the case of Lake Sibaya. It is also seen that, although the protein content expressed in terms of that present in the TOM to the TOM was very significantly related, the condition of the population is related to the overall P:E ratio of the diet.…”

Section: Discussionmentioning

confidence: 99%

Body condition and nutritional ecology of Oreochromis mossambicus (Pisces, Cichlidae) populations of man‐made lakes in Sri Lanka

Silva

1985

Journal of Fish Biology

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The nutritive quality of ingested material of adult Oreachrumis mossumhicus wild populations from 12 perennial. man-made lakes were evaluated for four climatic seasons. The seasonal variation in condition of each population, and the overall condition of each population, considered as the theoretical weight of a 20 cm individual, was computed from the length-weight regressions, which were curvilinear. The mean overall condition of the 0. mossumhicus reservoir population was 152.6 g (~0 . k 9 . 5 ) and ranged between 139.8 and 167.8 g. Distinct patterns in the seasonal changes in condition of an individual population were not apparent. The mean percentage of protein and total organic matter (TOM) and calorific content (kJ g -' ) of the ingested material were 20.7% (s.D. 3.7; range 9.6-35.2%), 46.0% (s.D. k9.8; range 20,9-73.7%) and I 1.6 (s.D. f 3.4; range 4.6-20.9) respectively. The amount of each of the above components for any one population varied seasonally in relation to the changes in feeding habit. The protein content of the ingested material of those populations devouring predominantly detritus also showed seasonal variability. The amount of protein (mg) in the digestible total organic matter (DTOM) and the calorific content (Cal) in the ingested material were rclated to the TOM content as follows: DTOM=3.21 (TOM)-47.8 (d.f.40; r=0,89; P

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Man-made lakes: ancient heritage and modern biological resource

Cited by 19 publications

References 21 publications

Freshwater finfish biodiversity and conservation: an asian perspective

Freshwater finfish biodiversity and conservation: an asian perspective

Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

Body condition and nutritional ecology of Oreochromis mossambicus (Pisces, Cichlidae) populations of man‐made lakes in Sri Lanka

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