Estudo dos vestígios de peixes dos sítios arqueológicos da área de influência da Usina Hidrelétrica Machadinho, Rio Grande do Sul, Brasil

Abstract

The analysis of the material obtained in the rescue of archaeological sites in the area surrounding the Hydroelectric Plant of Machadinho, Rio Grande do Sul, revealed that a considerable amount of bones and fish scales incorporated in the alimentary remains. Using an osteological collection as reference, we identified remains of Salminus brasiliensis (Cuvier, 1816) (Characidae), Brycon orbignyanus (Valenciennes, 1849) (Characidae), Pogonopoma obscurum Quevedo & Reis, 2002 (Loricariidae), Hemiancistrus fuliginosus Cardoso & Malabarba, 1999, Prochilodus lineatus (Valenciennes, 1836) (Prochilodontidae), Schizodon sp. (Anostomidae), Leporinus sp. (Anostomidae), Hoplias sp. (Erythrinidae), Hypostomus sp. (Loricariidae) and Crenicichla sp. (Cichlidae). Based on specimens from fish collections, regressions were obtained comparing the size of the pre-maxillary bone in Crenicichla spp. and the length of the pectoral fin spine of Hemiancistrus fuliginosus, Pogonopoma obscurum and Hypostomus spp, with the standard length and weight of corresponding specimens. The estimated size and weight of the specimens obtained from fish remains in the archaeological sites varied between 79.7-153.9 mm and 13.5-33.9 g for Hemiancistrus fuliginosus, 158.2-151.0 mm and 179.5-194.3 g for Pogonopoma obscurum, 117.1-166.2 mm and 86.6-93.1 g for Crenicichla spp., and 62.2-397.2 mm and 34-20.3 g for Hypostomus spp. Therefore using these estimates of standard lengths and weights it was possible to formulate a hypotheses on the fishing technology used by the inhabitants of these sites.