Ontogenetic changes in sagitta otoliths of whitemouth croaker Micropogonias furnieri (Acanthuriformes: Sciaenidae) and its implication in acoustic communication

Abstract The otoliths of teleosts are part the inner ear. They related to balance system and also mechanical components sound transmission, responsible for hearing in fish. Their morphology is determined by function they perform influenced environmental factors. In this context, our goal was to: analyse possible morphological changes sagitta Micropogonias furnieri (Desmarest, 1823) during its ontogeny, based on six biometric indexes. We analysed 162 sagittae collected Rio de la Plata estuary. variation indexes associated with different size groups. Rectangularity aspect ratio [otolith length/total fish length (OL/TL) sulcus area/otolith area (SA/OA)] were that contributed most discriminant function. Biometric index differences diverse juvenile environments. observed shift SA/OA relationship could be attributable a need respond change perception (pulse frequency) experienced individuals larger than 20 cm begin frequent same areas as spawning adults. sense, ontogenetic plays an important role acoustic communication species.