SciELO - Scientific Electronic Library Online

vol.43 issue4Location decisions and regulatory changes: the case of the Chilean aquacultureParasite burden in decapod crustaceans from the central coast of Chile: is there any association with the relationship with definitive host abundances? author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google


Latin american journal of aquatic research

On-line version ISSN 0718-560X


AVIGLIANO, Esteban et al. Identification of fish stocks of river crocker (Plagioscion ternetzi) in Paraná and Paraguay rivers by using otolith morphometric analysis. Lat. Am. J. Aquat. Res. [online]. 2015, vol.43, n.4, pp.718-725. ISSN 0718-560X.

The identification of fish stocks in basic requirement for fishing management. The objective of this research was to describe for the first time otoliths river crocker (Plagioscion ternetzi) and to evaluate the existence of different fish stocks in the Paraguay River lower basin and the middle Paraná River (northeast Argentinean region and southeast Paraguayan region). For this purpose, five morphometric indexes applied on sagitta otolith (rectangularity, circularity AO/SO, SS/SO and PS/PO) were compared between the study sites. The sagittae otoliths are semicircular and with smooth edges. Sulcus acusticusis is heterosulcoid and curved, with an ostium open widely in the anterior margin of the otolith. Significant differences were observed for circularity, rectangularity, SS/SO and PS/PO (t-test, P < 0.05). The T2 Hotteling multiparametric analysis showed significant differences between the study sites (P < 0.006), while the canonical discriminant showed a high classification percentage of the individuals (>69%). The results indicates that the stocks populations would be partially separated, with a considerable flow of individuals between these rivers.

Keywords : Plagioscion ternetzi; morphgometry; otolith; fish stocks; Paraná River; Paraguay River.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License