Life history of the riverine cyprinid Henicorhynchus siamensis (Sauvage, 1881) in a small reservoir |
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| Authors: | A. Suvarnaraksha S. Lek S. Lek‐Ang T. Jutagate |
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| Affiliation: | 1. Faculty of Agriculture, Ubon Ratchathnai University, Warin Chamrab, Ubon Ratchathani, Thailand;2. University of Toulouse III, Laboratoire Dynamique de la Biodiversité, CNRS – UPS, Toulouse Cedex, France;3. Faculty of Fisheries Technology and Aquatic Resources, Maejo University, Sansai, Chiangmai, Thailand |
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| Abstract: | The riverine species, Henicorhynchus siamensis (Sauvage 1881), is an important source of protein and an economical fish for the rural population of inland Indochina. Investigated in the present study were the reproductive feeding aspects and growth of H. siamensis living in a lake system. The gonadosomatic index peaked in August, which was delayed compared to river fish, and individuals took 1.5 years to attain the length of 50% maturity (about 200 mm). Stomach contents were dominated by phytoplankton and showed considerable seasonal variation. Asymptotic length of H. siamensis was 264.2 mm, with a 0.75 year?1 growth coefficient and slower growth during the winter. The role of the flood pulse as a major influence on the life history of the fish is also discussed. |
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