Deakin University
Browse

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

journal contribution
posted on 2005-01-01, 00:00 authored by U Jayasinghe, U Amarasinghe, S De Silva
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.


History

Journal

Lakes and reservoirs: research and management

Volume

10

Issue

3

Pagination

157 - 166

Publisher

Wiley Interscience

Location

New York, N.Y.

ISSN

1320-5331

eISSN

1440-1770

Language

eng

Notes

Published Online: 15 Sep 2005

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2008, Blackwell Publishing Asia Pty Ltd

Usage metrics

    Research Publications

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC