Scientia Marina, Vol 63, No 3-4 (1999)

Differences between the sagitta, lapillus and vertebra in estimating age and growth in juvenile Mediterranean dolphinfish (Coryphaena hippurus)


https://doi.org/10.3989/scimar.1999.63n3-4327

Beatriz Morales-Nin
CSIC./UIB.- Institut Mediterrani d’Estudis Avançats, Spain

Mirella Di Stefano
CNR - Istituto di Tecnologia della Pesca e del Pescato, Italy

Antonio Potoschi
Dipartimento di Biologia Animale ed Ecologia Marina, Università di Messina, Italy

Enric Massutí
IEO- Centre Oceanogràfic de les Balears, Spain

Pietro Rizzo
CNR - Istituto di Tecnologia della Pesca e del Pescato, Italy

Salvatore Gancitano
CNR - Istituto di Tecnologia della Pesca e del Pescato, Italy

Abstract


The otoliths (sagittae and lapilli) and the vertebral centra were evaluated as ageing structures in dolphinfish age 0 juveniles (17.2–72 cm FL) caught in the seasonal small-scale fisheries of Majorca and Sicily (western and central Mediterranean). Different structure preparation techniques were also tested. Mounting and polishing lapilli for preparing frontal sections required significantly less processing time than for the sagittae. The increments in lapillus were clearly visible from the primordium to the otolith margin, whereas the intermediate zone in the sagittae was more opaque and prevented the detection of all the increments. The back-calculated hatchdates for otolith ages showed a good correlation with the species reproduction in the area and provided indirect validation for the age determination. The vertebrae centra showed increments with higher periodicity than seasonal. A test of symmetry on the ages derived from the sagitta and vertebra of the same fish indicated that the vertebra significantly underestimated the age. Considering the structure processing time and increment definition, as well as the age-length relationships obtained, it was concluded that the lapilli were the best ageing structure for juvenile dolphinfish. However, validation experiments should be carried out before the accuracy of this method can be determined.

Keywords


age determination; otoliths; daily increments; vertebral centra; growth; Coryphaena hippurus; Mediterranean

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