Evaluation of natural food for planktivorous fish in Lakes Phewa, Begnas, and Rupa in Pokhara Valley, Nepal |
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Authors: | Ash Kumar Rai |
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Institution: | (1) Fisheries Research Division, Godawari, Lalitpur, P.O. Box 13342, Nepal, NP |
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Abstract: | Six floating 4-m3 cages stocked with 40 silver carp per cage (three cages) and 40 bighead carp per cage (three cages) were placed in each of
the three subtropical Lakes Phewa, Begnas, and Rupa. The fish were cultured, without supplying artificial feed, from August
1994 to December 1995. Fish growth was positively correlated with water temperature, and a slight loss in weight occurred
in January when water temperature fell below 16°C in all the lakes. Fish growth was better in Lake Phewa than in Lakes Begnas
and Rupa, where food might not have been sufficient or of a quality to sustain fish growth. The fish fed on mostly indigestible
phytoplankton, Microcystis aeruginosa in Lake Begnas and on Tabellaria fenestrata and Microcystis aeruginosa in Lake Rupa, which can lead to poor fish growth. The maximum growth rate of silver carp (5.8 g day−1) and bighead carp (4.7 g day−1) occurred in Lake Phewa when Ceratium hirundinella and Peridinium spp. were abundant from August through October. The food particles found in the gut were mostly similar in silver and bighead
carp, though Cladocerans (Bosmina longirostris) were observed sparsely in the gut contents of bighead carp only.
Received: May 21, 1999 / Accepted: September 28, 1999 |
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Keywords: | Silver carp and bighead carp Fish growth Plankton community Subtropical lakes |
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