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Feeding of Arapaima sp.: integrating stomach contents and local ecological knowledge
Authors:Cristina M Jacobi  Francisco Villamarín  João V Campos-Silva  Timothy Jardine  William E Magnusson
Institution:1. Department of Ecology, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil;2. Department of Biogeografia y Ecología Espacial, Grupo de Biogeografía y Ecología Espacial (BioGeoE2), Universidad Regional Amazónica - Ikiam, Tena, Ecuador;3. Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Alagoas, Maceió, Brazil;4. School of Environment and Sustainability, University of Saskatchewan, Saskatoon, Canada
Abstract:The giant arapaima (Arapaima sp.) has been described as a fish of change in Amazonia because of its important role in the conservation of floodplains, food security and income generation for rural communities. Nonetheless, despite the cultural, ecological and economic importance of arapaima, data on diet are scarce. Aiming to expand knowledge about arapaima diet in western Amazonia, scientific knowledge was integrated with the knowledge of local dwellers. During the low-water period (September 2018) and the falling-water period (June 2019), arapaima stomachs were collected from 11 floodplain lakes in the middle Juruá River. All fishes were measured TL (total length)] and sexed. Food items from each stomach were categorized as fishes, invertebrates, plants and bone remains and weighed. Also, in the latter period, experienced local fishers were interviewed about arapaima feeding. This integrated approach revealed that young arapaima eat fish and invertebrates but adult arapaima eat fish of a wide range of species, which were mainly of low and intermediate trophic positions. This study reports the first case of cannibalism for arapaima and also shows that during the low-water period, many individuals had empty stomachs or only some small fish-bone remains and/or plant material. Arapaima sex and TL had no influence on the absence of prey in stomach contents. Overall, it can be concluded that local people had consistent ethnobiological knowledge of arapaima feeding ecology that could be useful within management projects in the region.
Keywords:Amazon  diet  ethnobiology  ichthyology  predator
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