Identification of nurseries areas of Juvenile Prochilodus lienatus (Valenciennes, 1836) by scale and otolith morphometry and microchemistry

AVIGLIANO, E.;; CALLICÓ FORTUNATO,R; BIOLÉ, F; DOMANICO, A; DE SIMONE,S; NEIFF,J.J; VOLPEDO, A. V.

NEOTROPICAL ICHTHYOLOGY

SOC BRASILEIRA ICTIOLOGIA

Lugar: Porto Alegre; Año: 2016 vol. 14 p. 1 - 12

1679-6225

The streakedprochilod (Prochilodus lineatus Valenciennes, 1836) is acommercially freshwater species from South America, distributed in the PlataBasin. In the present work the morphometry (circularity, rectangularity, formfactor, OL/OW and ellipticity indices) and chemistry (Sr:Ca, Ba:Ca, Mg:Ca)of lapilli otolith, and geometric morphometry of scales of streaked prochilod juveniles, in two sites in the Plata basin(Uruguay River and Estrella Wetland), were compared to determine if they arearea-specific and to identify possible breeding areas. Otolith Ba:Ca ratios was0.017±0.003 mmol/mol for Uruguay River while was not above the detection limitsfor Estrella Wetland individuals. Zn:Ca ratios tended to be higherfor latter (0.03±0.002 mmol/mol). Significantly high circularity and lowrectangularity values were obtained for the Estrella Wetland otoliths(p < 0.05), while no significant differences for form factor, OL/OW andellipticity were observed between sampling sites. Considering all scalegeometric morphometry variables, discriminant analysis showed a goodpercentage of classification of individuals (90.5% forEstrella Wetland and 85.7 % for Uruguay River). These resultsindicate that the otolith microchemisty and morfometry (circularity andrectangularity indices) and scale morphometry are good markersof habitat and represent a potential tool for identification of streaked prochilod nursery areas.