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Length-weight relationships applicable to bluefin tuna juveniles (Thunnus thynnus) caught for farming purposes during the purse seine fishing season in the Adriatic

Following recently recommended equation by Standing Committee on Research and Statistics (SCRS) to calculate bluefin tuna weights from lengths measured by stereoscopic cameras, a model for Adriatic (RWT = 3.77278*10- 5xSFL2.86308) is determined on the basis of samples collected during purse seine fishing season in 2017. This length–weight relationship is compared with recently adopted ones by the International Commission for the Conservation of Atlantic Bluefin Tuna (ICCAT). The results of analysis indicates that the ICCAT equation recommended to be used in 2017 for the Mediterranean areas including bluefin tuna caught by traps in the Atlantic Ocean is not suitable for bluefin tuna juveniles caught during purse seine fishing season in the Adriatic. It is clear that the established model for the Adriatic region differs from the available models recommended by the relevant authorities suggesting the need to apply the regional approach with the adjustment of length–weight relationship to the size/age classes.

Bluefin tuna, Thunnus thynnus, stereo camera, Adriatic, length-weight relationships

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