@article{agostinho_2003,  title={Reproductive aspects of piranhas Serrasalmus spilopleura and Serrasalmus marginatus into the Upper Paraná River, Brazil},  volume={63},  ISSN={1519-6984},  url={https://doi.org/10.1590/S1519-69842003000100002},  DOI={10.1590/S1519-69842003000100002},  number={1},  journal={Brazilian Journal of Biology},  publisher={Instituto Internacional de Ecologia},  author={Agostinho, C. S.},  year={2003},  month={Feb},  pages={1–6} }