engleski

Spillover of the Atlantic bluefin tuna offspring from cages in the Adriatic Sea: A multidisciplinary approach and assessment

During routine monitoring of commercial purse seine catches in 2011, 87 fingerling speci- mens of scombrids were collected in the southern Adriatic Sea. Sequencing of the mito- chondrial DNA control region locus inferred that specimens belonged to the Atlantic bluefin tuna, Thunnus thynnus (Linnaeus, 1758) (N = 29), bullet tuna, Auxis rochei (Risso, 1810) (N = 30) and little tunny, Euthynnus alletteratus, Rafinesque, 1810 (N = 28). According to previously published growth parameters, the age of the collected specimens was estimated at approximately 30–40 days, suggesting they might have been spawned in the Adriatic Sea, contrary to the current knowledge. A coupled modelling system with hydrodynamic (ROMS) and individual based model (IBM— Ichthyop) was set up to determine the location of the spawning event. Numerical simulations with the IBM model, both backward and for- ward in time, indicate commercial tuna cages in the middle Adriatic coastal area as possible spawning location. The two other non-commercial species likely opportunistically use the positive environmental (abiotic and biotic) conditions to spawn in the same area.

Atlantic bluefin tuna ; Adriatic Sea ; individual based model ; Langrangian model ; Ichthyop ; ROMS ; Numerical modelling ; oceanographic numerical model ; molecular species identification ; tuna spawning in captivity

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