Resumen del producto

A first successful application of archival tags on striped marlin has shown great potential in obtaining long-term tracks for an improved understanding of their movement ecology, and to inform fisheries management. Due to the failure of external sensor stalk, which houses the light sensor, full records of daily fish position, unfortunately, could not be attained for ten devices physically recovered off tagged fish from the Eastern Pacific between 2008 and 2016. Depth-based geolocation that exploits the diel swimming patterns of striped marlin was developed to provide position estimates for archival-tagged fish for up to 7.7 years. Reconstructed tracks revealed tagged striped marlin remained in the Eastern Pacific throughout the tracked duration. Trans-equatorial movements were also documented for the first time for striped marlin in this region, as were extended occupancy of >1 year in pelagic waters. Striped marlin connected both coastal and offshore habitats with seasonal runs, likely in fulfillment of their life history requirements from foraging to reproduction. Circadian rhythms in billfish and other pelagic fishes are well-established, and could provide a viable, alternative means to position an individual in a low or no light environment, and situations with sub-optimal or limited bio-logging capabilities.

Palabras clave: Striped marlin; archival tagging; dispersal; Eastern Pacific

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