TY - JOUR AU - Gomes, Louise Cristina AU - Piana, Pitágoras Augusto AU - Sereia, Diesse Aparecida de Oliveira PY - 2018/04/25 Y2 - 2024/03/29 TI - Contrasting fish size distributions between Neotropical run-of-river and storage reservoirs JF - International Journal of Aquatic Biology JA - Intl. J. Aquat. Biol. VL - 6 IS - 2 SE - Articles DO - 10.22034/ijab.v6i2.464 UR - https://ij-aquaticbiology.com/index.php/ijab/article/view/464 SP - 95-103 AB - <p>The spectrum size has been used to assess environmental disturbances and to understanding the energy flow in ecosystems. The objective of this work was to investigate if the operation regimes of reservoirs, including run-of-river and storage systems, interfere with the biomass spectra of fish fauna. We tested the hypothesis that the run of river reservoirs present higher proportions of large individuals than storage system. Samplings of fish fauna were carried out between January 2005 and December 2007 at six Neotropical reservoirs belonging to the sub-basin Iguaí§u River and Coastal basin in Sí£o Jorge River, Brazil. The spectrum calculation was performed using the Pareto type I continuous distribution model. Reservoirs operated under run-of-river regime had significantly higher values than those operated under storage regimes. This study has elucidated some impacts of reservoir operating regime on biomass spectra and indicated differences in size spectra of fish assemblages among the sampled reservoirs. Therefore, it is important to incorporate management plans that take dam operating mode into account so that conservation of aquatic fauna, especially fish, is more effective.</p> ER -