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Diel feeding periodicity, daily ration and relative food consumption in some fish populations in three reservoirsof Sri Lanka

Published online by Cambridge University Press:  25 November 2006

Wasantha S. Weliange ,
Upali S. Amarasinghe ,
Jacques Moreau  and
Maria Concepcion Villanueva
Wasantha S. Weliange
Affiliation:
Department of Zoology, University of Kelaniya, Kelaniya 11600, Sri Lanka
Upali S. Amarasinghe
Affiliation:
Department of Zoology, University of Kelaniya, Kelaniya 11600, Sri Lanka
Jacques Moreau
Affiliation:
Laboratoire d'Agronomie Environnement et Ecotoxicologie, INP/ENSAT, BP 32607, Auzeville-Tolosane 31326 Castanet-Tolosan Cedex, France
Maria Concepcion Villanueva
Affiliation:
Laboratoire d'Agronomie Environnement et Ecotoxicologie, INP/ENSAT, BP 32607, Auzeville-Tolosane 31326 Castanet-Tolosan Cedex, France Laboratoire Ressources halieutiques, IFREMER, BP 32, 14520 Port-en-Bessin Huppain Cedex, France
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Abstract

Twelve diel surveys were carried out in three reservoirs of Sri Lanka viz. Minneriya, Udawalawe and Victoria, to investigate diel feeding patterns, daily ration and relative food consumption in fish populations. Stomach content weights of different size classes of various fish species in the three reservoirs in 12 diel surveys were analysed using an iterative method, MAXIMS. Predominantly herbivorous or detritivorous fish species such as Amblypharyngodon melettinus and Oreochromis niloticus exhibited one peak in the diel feeding pattern. Two peak feeding periods were evident in predominantly insectivores and/or zooplanktivores (e.g., Puntius chola and Rasbora daniconius) and interestingly in macrophyte feeders (i.e., Etroplus suratensis, Puntius filamentosus and Tilapia rendalli). It might be possible that all species with two feeding peaks in diel feeding patterns rely on vision for feeding.Food consumption per biomass (Q/B ratio) defined as amount of food consumed per unit weight of an age-structured population of fish was estimated on the basis of the average quantities of food consumed over a long period of time by various size classes in order to minimize the bias of estimates.

Keywords

Diel feeding patternFeeding chronologyFreshwater fishTrophic modellingCyprinidaeCichlidae
Type
Research Article
Information
Aquatic Living Resources , Volume 19 , Issue 3 , July 2006 , pp. 229 - 237
Copyright
© EDP Sciences, IFREMER, IRD, 2006

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