These large populations (~ 900 individuals) return each year to the same sites nursery for the birth and care of juveniles . So, we can sample the same people year after year . Most of these individuals were followed for 2010 through a systematic marking the location of a transponder, led by Frédéric Touzalin and Olivier Farcy and made possible by the many volunteers of the Association Bretagne Vivante project . With this monitoring, we can assign each individual to three different groups: i) <1 years, juvenile 2013; ii) 1-4 years, young adults between transpondés 2010 and 2013; iii) 4 and over, adults in transpondés 2010.
Hizi idadi kubwa ya watu (~ 900 watu binafsi) kurudi kila mwaka kwa kitalu hicho maeneo kwa ajili ya kuzaliwa na huduma ya ungfisk . Hivyo, tunaweza sampuli watu sawa mwaka baada ya mwaka . Wengi wa watu hawa walikuwa na kufuatiwa kwa 2010 kupitia utaratibu kuashiria eneo la transponder, wakiongozwa na Frédéric Touzalin na Olivier Farcy na inawezekana kwa kujitolea wengi wa mradi wa Chama Bretagne Vivante .