Atlantic Bluefin Tuna (Thunnus thynnus) Biometrics and Condition
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AuthorsRodriguez-Marin, E. (Enrique); Ortiz, M.; Ortiz-de-Urbina-Gutiérrez, J.M. (José María); Quelle, P. (Pablo); Walter, J.; Abid, N.; Addis, P.; Alot-Montes, E. (Enrique); Andrushchenko, I.; Deguara, S.; Di Natale, A.; Gatt, M.; Golet, W.; Karakulak, S.; Kimoto, A.; Macías-López, A.D. (Ángel David); Saber-Rodríguez, S. (Sámar); Santos, M.N.; Zarrad, R.
KeywordsAtlantic bluefin tuna, Thunnus thynnus, biometry, length-weight relationships, fish condition, conversion factors
The compiled data for this study represents the first Atlantic and Mediterranean-wide effort to pool all available biometric data for Atlantic bluefin tuna (Thunnus thynnus) with the collaboration of many countries and scientific groups. Biometric relationships were based on an extensive sampling (over 140,000 fish sampled), covering most of the fishing areas for this species in the North Atlantic Ocean and Mediterranean Sea. Sensitivity analyses were carried out to evaluate the representativeness of sampling and explore the most adequate procedure to fit the weight-length relationship (WLR). The selected model for the WLRs by stock included standardized data series (common measurement types) weighted by the inverse variability. There was little difference between annual stock-specific round weight-straight fork length relationships, with an overall difference of 6% in weight. The predicted weight by month was estimated as an additional component in the exponent of the weigh ...
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