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This study evaluated the diet of Pimelodus sp., before and after damming of Salto Caxias, (waterfall in the Iguaçu river), as well spatial and ontogenetic diet shift. Surveys were carried out from March 1997 to February 1998 (before damming) and from April 1999 to January 2000 (after damming) inside the reservoir and adjacent tributaries. Stomach contents analysis of 682 specimens revealed omnivory with high degree of trophic opportunism to this species. Analysis of variance (three way ANOVA) for scores produced from Detrended Correspondence Analysis (DCA) yielded a significant interaction between the damming phases and size of the individuals (juveniles and adults) (F = 4.68; P = 0.04). After damming, adults exploited mainly fish, whereas the juveniles fed mostly on plants, dipterans larvae and scales at different sites. From significant differences in the ordination among the factors considered, it could be inferred that the diet of Pimelodus sp. was influenced by the formation of the reservoir and this depended on the life stage considered. Position of the sites (feeding grounds) did not lead to significant alterations in diet. Esse estudo avaliou a dieta de Pimelodus sp., antes e após o represamento de Salto Caxias, no rio Iguaçu, bem como variações espaciais e ontogenéticas na dieta da espécie. As amostragens foram realizadas antes do represamento (março/97 a fevereiro/98) e no período posterior (abril/99 a janeiro/00), no corpo principal do reservatório e tributários adjacentes. A análise de conteúdos estomacais de 682 exemplares revelou que esta espécie é onívora com elevado oportunismo trófico. Após o represamento, indivíduos adultos exploraram principalmente peixes, enquanto que os juvenis consumiram especialmente plantas, larvas de Diptera e escamas em diferentes locais de coleta. A análise de variância (ANOVA trifatorial) aplicada sobre os escores da análise de correspondência com remoção do efeito do arco (DCA), mostrou uma interação significativa (F = 4.68; P = 0.04) entre as fases de represamento e o tamanho dos indivíduos (juvenis e adultos). Uma vez determinada as diferenças significantes na ordenação entre os fatores considerados, nós podemos inferir que a dieta de Pimelodus sp. foi influenciada pela formação do reservatório e isso dependeu do tamanho dos indivíduos. As análises por locais de coleta não mostraram diferenças significantes na dieta

Diet of a catfish before and after damming of the salto caxias reservoir, iguaçu river