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Ontogenetic diet shifts of Oreochromis niloticus and Tilapia rendalli of the Barra Bonita reservoir (Tietê river, São Paulo State, Brazil) - doi: 10.4025/actascibiolsci.v34i3.9971
- Source :
- Acta Scientiarum: Biological Sciences, Vol 34, Iss 3 (2012)
- Publication Year :
- 2012
- Publisher :
- Universidade Estadual de Maringá, 2012.
-
Abstract
- The Nile Tilapia, Oreochromis niloticus, and the Congo Tilapia, Tilapia rendalli, are important members of the African cichlids, and have been introduced to many Brazilian lakes and reservoirs. These species exhibit a large feeding flexibility and may modify their habits during their growth. In the Barra Bonita reservoir, these species are well adapted, representing more than 80% of fish. This study aimed to analyze ontogenetic variation with regard to the diet of these species in this important reservoir. Samples were taken monthly, from March 2007 to February 2008, in Anhembi, São Paulo State. Both species were analyzed by grouping individuals according to size classes. The coexistence of these species was observed in this environment, to which fish were introduced, as well as discreet differences in diet, being that Oreochromis niloticus was considered as an detritivorous, since the detritus was constant in the diet of almost all size classes, and presents some changes in its diet according to the different size classes. While T. rendalli may was defined as herbivorous, and the contribution of food resources to the diet of T. rendalli seems to be different from that of O. niloticus along the size classes.
Details
- Language :
- English
- ISSN :
- 16799283 and 1807863X
- Volume :
- 34
- Issue :
- 3
- Database :
- Directory of Open Access Journals
- Journal :
- Acta Scientiarum: Biological Sciences
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.412df0c09d444985b6e672a6c8f92680
- Document Type :
- article
- Full Text :
- https://doi.org/10.4025/actascibiolsci.v34i3.9971