Otolith microchemistry analysis revealed that bycatch of European shads, allis shad Alosa alosa and twaite shad Alosa fallax , in western Iberian commercial fisheries removes individuals from a wide array of natal origins, with the most abundant source rivers suffering the heaviest losses. Spatial variation in bycatch risk was evident: Specific marine areas exhibited high natal origin diversity, reflecting complex dispersal. A...

Regular monitoring of diadromous fishes is critical to inform their management and conservation. Yet, the in situ data collection for these species is challenging due to their complex life cycle and low abundance. Focusing on the sea lamprey ( Petromyzon marinus , Petromyzontidae) and the European shads (allis shad Alosa alosa and twaite shad Alosa fallax , Clupeidae), emblematic diadromous fishes in the Northeast Atlantic reg...

Introduction Many diadromous fish species are currently facing the threat of generalized population extirpations across their range, and conservation efforts implemented primarily within the continental domain may not be sufficient to ensure their viability. In consequence, better understanding the use of the marine environment by these species turned out to be critical. Material and method We developed marine species distribu...