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- Shark Research and Data Collection Program: progress on the age and growth of the shortfin mako in the Atlantic OceanPublication . Coelho, Rui; Carlson, John; Natanson, Lisa; Rosa, Daniela; Mas, Federico; Mathers, Alyssa; Domingo, Andrés; Santos, Miguel N.This paper presents an update of the age and growth study within the ICCAT Shark Research and Data Collection Program (SRDCP), including the current development status and plans for the 2nd phase of the project. There are currently 469 vertebrae samples (205 females, 257 males and 7 specimens with unidentified sex) collected and processed from both the North and Southern hemispheres. The sample distribution is much more complete in the north, while in the south at this stage there are only samples from the equatorial region. The size range of the samples varies from 52 cm to 366 cm FL. The next steps of this projects is proposing a workshop on age reading and growth in order to prepare a reference set of vertebrae that can be used as a guideline for the readings of the remaining sample, and also discuss aspects of age validation and band deposition periodicity. The final results will be presented to the SCRS sharks working group in 2017, in order to contribute to the 2017 shortfin mako stock assessment.
- Shark Research and Data Collection Program: progress on the satellite tagging of shortfin mako for post-release survival and habitat use studiesPublication . Coelho, Rui; Domingo, Andrés; Carlson, John; Cortés, Enric; Rosa, Daniela; ller, Philip; Santos, Miguel N.This paper provides an update of two projects developed within the ICCAT Shark Research and Data Collection Program (SRDCP) using satellite telemetry, specifically a study on habitat use and other on post-release survival. At the time of this paper, 10 tags (6 miniPATs and 4 sPAT) had been deployed from observers on Portuguese fishing vessels in the temperate NE Atlantic. The remaining tags are being deployed by USA in the temperate NW and Uruguay in the SW. The preliminary analysis shows that specimens tagged in the temperate NE moved to southern areas, while specimens tagged in the tropical NE close to the Cabo Verde archipelago moved easterly to the African continent. Three tags were deployed in equatorial waters and one moved to the NE while the other moved SE. In terms of post-release survivorship, 2 specimens tagged with sPATs survived and 2 died. For the 2nd year of the project we will acquire additional miniPATs to be deployed preferably in equatorial waters, in the mixing zone for the stocks.