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Triploidization influences various biological characteristics of fish, which is associated with reductions in the number of multiple cell types in different tissues/organs. Our behavioral analyses revealed that triploid Pacific bluefin tuna (Thunnus orientalis) larvae exhibit lower sensitivity to light compared to diploids. Furthermore, histological analyses revealed a reduction in the number of ganglion cells and an increase in their size in the retinas of triploid T. orientalis larvae. Our findings provide the first evidence indicating that triploidization reduces sensory perception during the larval stage of fish. [ABSTRACT FROM AUTHOR]

A captive-raised Pacific bluefin tuna, Thunnus orientalis, 145·6 cmLT , 35·2 kg M, was found to be a hermaphrodite. This is the first record of hermaphroditism in this species. [Copyright &y& Elsevier]