Pelagic longline fishing trials to shape a mitigation device of the depredation by toothed whales

► We design an innovative toothed whale depredation mitigation device. ► Our device aims at physically protecting longline-caught fish. ► We report an important toothed whale depredation rate. ► We face some operational constraints when trying to routinely deploy our devices. ► We need to improve our devices but our results are nevertheless promising.