Growth of bluefin tuna (Thunnus thynnus) in the North-eastern Atlantic and Mediterranean based on back-calculation of dorsal fin spine annuli
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AuthorsLanda, J. (Jorge); Rodríguez-Marín, E. (Enrique); Lastra-Luque, P. (Patricia); Ruiz, M. (Marta); Quelle-Eijo, P. (Pablo)
The growth of bluefin tuna (Thunnus thynnus) in the North-eastern Atlantic and Mediterranean wasanalysed using the back-calculation of the dorsal fin spine annuli. Spines from a total of 2678 bluefin tuna,collected from 1984 and 1990–2010, were analyzed. The specimens ranged from 45 to 287 cm straightfork length (SFL). Both linear and power regression functions showed a significant relationship betweenspine radius and SFL, but power function fitted better than linear (SFL = 42.978R0.884, r2= 0.98), as also wasfound in previous studies when a wide range of sizes was available. Two back-calculation equations wereused to obtain the back-calculated SFL, Fraser-Lee and Body Proportional Hypothesis (BPH), showingsimilar results. The Von Bertalanffy growth parameters obtained with the selected BPH model were:SFL = 349.5(1 − e−0.086(t+0.814)). Back-calculated lengths and growth parameters showed similarities withthose from previous literature.
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