Discrimination of red porgy Pagrus pagrus (Sparidae) potential stocks in the south-western Atlantic by otolith shape analysis.

Autor: Kikuchi E; Laboratório de Recursos Pesqueiros Demersais, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Brazil.; Programa de Pós-Graduação em Oceanografia Biológica, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Brazil., García S; Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina., da Costa PAS; Departamento de Ecologia e Recursos Marinhos, IBIO, Universidade Federal do Estado do Rio de Janeiro, UNIRIO, Rio de Janeiro, Brazil., Cardoso LG; Laboratório de Recursos Pesqueiros Demersais, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Brazil., Haimovici M; Laboratório de Recursos Pesqueiros Demersais, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Brazil.
Jazyk: angličtina
Zdroj: Journal of fish biology [J Fish Biol] 2021 Feb; Vol. 98 (2), pp. 548-556. Date of Electronic Publication: 2020 Nov 09.
DOI: 10.1111/jfb.14598
Abstrakt: Otolith shape analysis is a powerful method for fish stock identification. We compared the otolith shape of Pagrus pagrus (Linnaeus 1758) along with its distribution in four south-western Atlantic regions where it is commercially fished: Rio de Janeiro, Rio Grande do Sul in southern Brazil, the Argentine-Uruguayan Common Fishing Zone (UA) and the Argentinian Exclusive Fishing Zone (AR). Otolith shapes were compared by Elliptical Fourier and Wavelet coefficients among specimens in a size range with similar otoliths, morphometric parameters and ages. Four potential stocks were identified: one in the AR, a second along the UA which included specimens from southern Brazil with well-marked opaque bands in its otoliths (MRS), the third in southern Brazil with faint or absent opaque bands in its otoliths (FRS) and the fourth along Rio de Janeiro. The difference in the otolith shape among regions followed differences reported using other stock identification techniques. The similarity between otoliths from UA and MRS (ANOVA-like, P > 0.01) can be explained by seasonal short-range migrations. Otoliths shape differences between MRS and FRS (ANOVA-like, P < 0.01) suggest that P. pagrus does not form a homogeneous group in southern Brazil.
(© 2020 Fisheries Society of the British Isles.)
Databáze: MEDLINE
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