CECOAL   02625
CENTRO DE ECOLOGIA APLICADA DEL LITORAL
Unidad Ejecutora - UE
artículos
Título:
Identification of fish stocks of river crocker (Plagioscion ternetzi) in Paraná and Paraguay rivers by otolith morphometry
Autor/es:
ESTEBAN AVIGLIANO; GUY COMTE; PAOLA DELLA ROSA; SEBASTIÁN SÁNCHEZ; EZEQUIEL MABRAGAÑA; JUAN JOSE ROSSO; FRANCO DEL ROSSO; ALEJANDRA VANINA VOLPEDO; NAHUEL SCHENONE
Revista:
LATIN AMERICAN JOURNAL OF AQUATIC RESEARCH
Editorial:
UNIV CATOLICA DE VALPARAISO
Referencias:
Lugar: Valparaíso; Año: 2015 vol. 43 p. 718 - 725
ISSN:
0718-560X
Resumen:
The identification of fish stocks in basic requirement for fishing management in large rivers. 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  (26°31´20.78"S, 58°13´45.94"W) and the middle Paraná river (27°13´44.72"S, 57°47´47.36"W; 27°25´20.66"S, 56°40´45.71"W) (northeast Argentinean region and southeast Paraguayan region). For this purpose, five morphometric index applied on sagitta otolith (rectangularity, circularity AO/SO, SS/SO and PS/PO) were compared between the study sites. The sagitta 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.