Precision of Age Estimation in Goldlined Seabream Rhabdosargus sarba (Sparidae) from the Arabian Sea, Oman

Abstract

Accurate age determination of commercial fish is vital to successful fisheries management. Reliable age determination is essential for almost all aspects of fishery research, especially for study of growth, production, population structure and dynamics. The validation of aging methods is an important step in estimating growth and longevity. This study presents the validation of otolith-reading method for age estimation of goldlined seabream Rhabdosargus sarba. A total of 1185 goldlined seabream otoliths collected from the Arabian Sea of which 350 specimens were read by two different readers for whole and sectioned otoliths. Age comparisons between whole and thin-sectioned otoliths showed agreement in age readings for age groups 2-5 years and the whole otoliths tended to give lower ages than those estimated by thin sections. APE ranged from 3 to 7% for the three readings. Common differences between readers were related to interpretation of the otolith edge type and to interpretation of the first annulus.

Keywords: Sparidae, Rhabdosargus sarba, Otolith; age; average percent error; management.