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Limnology and culture-based fisheries in non-perennial reservoirs in Sri Lanka

Jayasinghe, U. Asanka D., Amarasinghe, Upali S. and De Silva, Sena 2005, Limnology and culture-based fisheries in non-perennial reservoirs in Sri Lanka, Lakes and reservoirs: research and management, vol. 10, no. 3, pp. 157-166, doi: 10.1111/j.1440-1770.2005.00271.x.

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Title Limnology and culture-based fisheries in non-perennial reservoirs in Sri Lanka
Author(s) Jayasinghe, U. Asanka D.
Amarasinghe, Upali S.
De Silva, Sena
Journal name Lakes and reservoirs: research and management
Volume number 10
Issue number 3
Start page 157
End page 166
Publisher Wiley Interscience
Place of publication New York, N.Y.
Publication date 2005
ISSN 1320-5331
1440-1770
Keyword(s) carp
culture-based fisheries
fish yield
limnology
reservoirs
Sri Lanka
tilapia
Summary This study was carried out to investigate the possibility of using the limnological characteristics of non-perennial reservoirs in Sri Lanka for the future management of culture-based fisheries. Forty-five reservoirs were randomly selected to study their limnology, out of which 32 were stocked with fish fingerlings of Chinese and Indian carps, tilapia and freshwater prawn at stocking densities ranging from 218–4372 fingerlings ha−1. Of these, 23 reservoirs were harvested at the end of the culture period (6–10 months). Thirteen limnological parameters were measured during the water retention period of each of the 45 reservoirs between November 2001 and January 2004. The mean values of the limnological parameters were used to ordinate the reservoirs through principal component analysis. Ordination showed a productivity gradient among reservoirs where Secchi disc depth, total phosphorus, chlorophyll-a, inorganic turbidity and organic turbidity were identified as key factors. The total fish yield of culture-based fisheries was positively correlated to the scores of the first principal component axis. This study reveals that it is possible to classify non-perennial reservoirs in Sri Lanka based on the above limnological parameters in order to develop culture-based fisheries and that they could be applicable in comparable water bodies elsewhere in the tropics.


Notes Published Online: 15 Sep 2005
Language eng
DOI 10.1111/j.1440-1770.2005.00271.x
Field of Research 070401 Aquaculture
Socio Economic Objective 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2008, Blackwell Publishing Asia Pty Ltd
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008857

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