Occurrence of the golden mussel Limnoperna fortunei (Dunker, 1857) (Mollusca; Bivalvia; Mytilidae), in the digestive tract of "armal†Pterodoras granulosus (Valenciennes, 1821) (Siluriformes; Doradidae), of the Paraná River, Saint Paul State

Abstract

During the preparing of fishes of the Paraná River for ichthyologic collection, it was observed exemplars of the golden mussel Limnoperna fortunei (Dunker, 1857) (Mollusca; Bivalvia; Mytilidae) in the intestine of the "armal", Pterodoras granulosus (Valenciennes, 1821). The stomach of the fish was opened and observed the presence of 17 individuals of L. fortunei with longitudinal length between 5 and 27 mm. From the intestine sample, the exemplars of golden mussel were counted and measured, showing lengths from 4 to 27 mm. This number was extrapolated for the entire intestine, being registered 640 individuals, which added to the 17 individuals observed in the stomach, totalized 657 exemplars.