| Summary: | Cichla piquiti is endemic to the Tocantins-Araguaia river basin, but information about its biology is restricted to populations introduced in other basins. In order to fill this gap, we investigated the feeding ecology and reproductive dynamics of C. piquiti in Lajeado reservoir, rio Tocantins. A total of 270 fish were collected between November 2010 and October 2011. The diet is rich and composed of at least 23 resources, predominantly fish (at least 19 species). We observed no clear influence of sex, periods and ontogeny on diet, which was basically composed of Characidae and Cichlidae. Considering its reproductive dynamics, immature, reproductive and non-reproductive fish were recorded during the whole study, and reproductive effort did not differ among periods. Cichla piquiti also showed no pattern of energy allocation between reproductive and somatic activities. These results indicate that reproduction is occurring throughout the year and that this activity is not synchronized among individuals. In conclusion, this study presented valuable information on the ecology of C. piquiti within its natural range, which may subsidize management programs to conserve local stocks. This information may also provide theoretical insights to explain why C. piquiti , a voracious predator, is so harmful when introduced in non-Amazonian reservoirs.
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