Natural foods utilized by Nile tilapia, <Emphasis Type="Italic">Oreochromis niloticus</Emphasis>, in fertilizer-based fish ponds in Lao PDR identified through stable isotope analysis |
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| Authors: | Yukari Asano Ken-ichi Hayashizaki Hiroki Eda Thongkhoune Khonglaliang Hisashi Kurokura |
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| Institution: | (1) Department of Global Agriculture Sciences, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan;(2) Department of Marine Biosciences, School of Fisheries Sciences, Kitasato University, Sanriku, Ofunato Iwate, 022-0101, Japan;(3) ICNET Limited, FSK Building 3F, 4-1 Shintoshin, Chuou, Saitama 330-0081, Japan;(4) Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, P.O. Box 6644, Vientiane, 01000, Lao PDR |
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| Abstract: | Nile tilapia, Oreochromis niloticus, is one of the most popular freshwater aquaculture species in developing countries. Although formulated feed provides higher
fish yield, it is expensive. Therefore, fertilizer-based fish culture using natural food sources is generally implemented
in developing countries. The aim of this study was to identify the major natural foods contributing to tilapia growth in fertilizer-based
fish ponds. The stomach contents of tilapia in a fertilizer-based fish pond in Lao PDR were analyzed to estimate their feeding
behaviors; stable isotope ratios of carbon and nitrogen in the potential food organisms and suspended solids were measured
and compared with the ratios in the fish muscle tissues. Further, the feed efficiency of chironomid larvae was compared with
that of chlorella and formulated feed in a laboratory feeding experiment. Consequently, chironomid larvae were identified
as the main contributors to tilapia growth in the fertilizer-based fish pond. In conclusion, benthic larvae of insects belonging
to the family Chironomidae are confirmed to be a natural food source for tilapia in the fertilizer-based fish pond. |
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