2024-03-28T12:55:54Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/52792019-02-21T10:40:35Zcom_10261_132com_10261_8col_10261_385
2008-06-25T07:06:41Z
urn:hdl:10261/5279
Differences between the sagitta, lapillus and vertebra in estimating age and growth in juvenile Mediterranean dolphinfish (Coryphaena hippurus)
Morales-Nin, Beatriz
Di Stefano, Mirella
Potoschi, Antonio
Massutí, Enric
Rizzo, Pietro
Gancitano, Salvatore
Age determination
Otoliths
Daily increments
Vertebral centra
Growth
Coryphaena hippurus
Mediterranean
Publicación online disponible en: http://www.icm.csic.es/scimar/index.php
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.
2008-06-25T07:06:41Z
2008-06-25T07:06:41Z
1999
artículo
Sci. Mar. 63(3-4): 327-336
0214 - 8358
http://hdl.handle.net/10261/5279
1886 - 8134
eng
openAccess
CSIC - Instituto de Ciencias del Mar (ICM)