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This study evaluated feeding patterns and ontogenetic variations in a non-native fish species ( Plagioscion squamosissimus ) in an isolated lake in the Upper Paraná River floodplain. Quarterly samplings were performed from April 2005 to February 2006 using plankton nets to capture larvae, seining nets for juveniles, and gill nets and trammel for adults. Stomach contents (n = 378) were examined according to the volumetric method in which the volume of each food item was estimated using graduated test tubes or a glass counting plate. During early development (larval stage),  P .  squamosissimus  consumed mainly Cladocera and Copepoda. Juveniles showed a more diverse diet, including shrimp ( Macrobrachium amazonicum ), fish, aquatic insects (Trichoptera, Ephemeroptera, Chironomidae and pupae of Diptera) and plants. It was notable the high proportion of cannibalism (23.3%) in this stage. Adults consumed predominantly shrimp and fish. The use of food resources varied significantly between development stages (ANOSIM; r = 0.458;  p <0.005), showing changes in food preferences during ontogeny. The Similarity Percentage Analysis (SIMPER) indicated that Cladocera and Copepoda were responsible for the differences observed between the larval stages of pre-flexion, flexion and post-flexion.  M .  amazonicum  and Chironomidae were responsible for the differences between juvenile and larval stages, while  M .  amazonicum  and other fishes caused the differences between adults and other ontogenetic stages. These results are confirmed by the relationship between standard length and developmental periods (ANCOVA; r 2  = 0.94;  p <0.0001). In general, there were low values of trophic niche breadth. The essentially carnivorous habit from the early stages of  P .  squamosissimus  and the predominant use of  M .  amazonicum  by adults have important roles in feeding patterns of the species, suggesting a major contribution to its success and establishment, especially in lentic environments.

Carnivory during Ontogeny of the Plagioscion squamosissimus: A Successful Non-Native Fish in a Lentic Environment of the Upper Paraná River Basin