A review of direct ageing methodology using dorsal fin spine from Atlantic bluefin tuna (Thunnus thynnus).
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Autor/esLuque, P.L.; Rodriguez-Marin, E. (Enrique); Ruiz, M. (Marta); Quelle, P. (Pablo); Landa, J. (Jorge); Macías-López, A.D. (Ángel David)
This paper aims to fill the limited literature description of important areas of concern that may influence age estimates of ABFT using spine cross-sections methodology. A total of 3862 ABFT were sampled from the North East Atlantic and the Mediterranean Sea over 21 year period. The first spiniform ray of the first dorsal fin (spine) was removed and cross-sectioned near the condyle base in order to count annulus for age determination. The regression between spine diameter and SFL showed high determination coefficient indicating that the size of the spine and fish body were closely related. Results from edge type and marginal increment analysis confirmed an annual periodicity of annulus formation. In assessing spine nucleus vascularization, approximately half of the total number of inner annulus were missing. A new spine sectioning level showed a clear improvement respect to the “traditional” location reducing the influence of nucleus remodelling. Mean lengths at age obtained ...