Otolith shape analysis as a tool for stock discrimination of the black scabbardfish, <i>Aphanopus carbo</i> Lowe, 1839 (Pisces: Trichiuridae), in Portuguese waters

Inês Farias; Ana Rita Vieira; Leonel Serrano Gordo; Ivone Figueiredo

doi:10.3989/scimar.2009.73s2047

Autores/as

Inês Farias Unidade de Recursos Marinhos e Sustentabilidade, INRB
Ana Rita Vieira Departamento de Biologia Animal and Centro de Oceanografia, Faculdade de Ciências da Universidade de Lisboa
Leonel Serrano Gordo Departamento de Biologia Animal and Centro de Oceanografia, Faculdade de Ciências da Universidade de Lisboa
Ivone Figueiredo Unidade de Recursos Marinhos e Sustentabilidade, INRB

DOI:

https://doi.org/10.3989/scimar.2009.73s2047

Palabras clave:

sable negro, otolito, contorno, forma, descriptores de Fourier

Resumen

Se analizó la variabilidad de forma del contorno de otolitos del sable negro (Aphanopus carbo) procedentes de aguas Portuguesas como posible herramienta por la gestión de stocks. La imagen del contorno de otolitos de ejemplares capturados frente a la costa portuguesa, Archipiélago de Madeira y Archipiélago de Azores fue digitalizada y extraída conforme la técnica de análisis de Fourier para contornos cerrados. Como primer paso se compararon ejemplares de la costa portuguesa y de Madeira a través de un MANOVA sobre los descriptores elípticos de Fourier normalizados (NEFDs) estimados para los otolitos de 200 hembras y 200 machos de cada localidad. Se observaron diferencias significativas entre áreas y entre sexos, pero no hubo interacción entre los dos factores. El efecto del área también resultó ser significativo cuando se consideraron las muestras de las tres regiones. Estos resultados fueron corroborados por el análisis discriminante de los NEFDs para los cuales el porcentaje de clasificaciones correctas estuvo comprendido entre 87.5 y 89% cuando se compararon los NEFDs de la costa portuguesa y de Madeira por sexo, y considerando la talla del pez; y entre 90.9 y 97.7% cuando se consideraron las tres áreas por sexo y la talla total. Se demostró que la forma del contorno del otolito es una posible herramienta para diferenciar grupos de sable negro.

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