Reproductive biology of round sardinella (<i>Sardinella aurita</i>) in north-eastern Mediterranean

Athanassios C. Tsikliras; Efthimia Antonopoulou

doi:10.3989/scimar.2006.70n2281

Autores/as

Athanassios C. Tsikliras Aristotle University of Thessaloniki, School of Biology, Department of Zoology, Laboratory of Animal Physiology
Efthimia Antonopoulou Aristotle University of Thessaloniki, School of Biology, Department of Zoology, Laboratory of Animal Physiology

DOI:

https://doi.org/10.3989/scimar.2006.70n2281

Palabras clave:

proporción de sexos, maduración sexual, fecundidad, puesta, alacha, Mar Egeo, Mediterráneo

Resumen

La biología reproductiva de la alacha, Sardinella aurita Valenciennes, 1847 fue estudiada por primera vez en el Mediterráneo NE. Esta especie ha sido recientemente motivo de atención debido a su incremento de biomasa, que podría ser debido a cambios climáticos en el Mediterráneo. Se obtuvieron muestras mensuales a bordo de barcos de pesca con artes de cerco durante dos ciclos anuales completos (Septiembre de 2000-Agosto de 2002). La alacha es una especie gonocorista. Globalmente, la proporción de sexos no fue estadísticamente (P=0.34) diferente de la unidad. Los cambios estacionales en el índice gonadosomático y en las características macroscópicas de las gónadas mostraron que la época de puesta de la alacha en el norte del mar Egeo tiene lugar entre Mayo y Julio. Los machos de la alacha alcanzaron la madurez sexual a una talla total inferior a la de las hembras (155.0 y 168.3 mm, respectivamente). La fecundidad media absoluta (F_A) se incrementó exponencialmente con la talla (F_A=0.0949×L^4.22) y peso (F_A=511.19×W^1.02), con una media de ~21,000 oocitos producidos por hembra madura. La fecundidad relativa (FR) osciló entre 242 y 681 oocitos/g de peso corporal (promedio: 445 oocitos/g). La distribución de frecuencias de los oocitos mostró que la alacha produce una única cohorte de oocitos. En general, las carácterísticas reproductivas de la alacha del Mediterráneo NE son distintas de las observadas en poblaciones de otras áreas de su distribución.

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