*Work Package Leader: Simon Berrow, Irish Whale and Dolphin Group *Project Partners: Galway Mayo Institute of Technology *Author(s): Berrow, S.D. and O’Connor, I. *Project Duration: 01 February 2008 to 31August 2011 Biotelemetry is the transmission of information from biological organisms through the atmosphere by radio waves. It encompasses a wide range of devices that can record environmental variables while attached to an animal, such as depth, salinity and temperature, while permitting the recording and transmitting of the position of an animal, commonly referred to as tracking. A review of biotelemetry, with reference to relevant species in Ireland, is presented. Although a number of marine species have been tagged and tracked in Ireland, these studies were generally of short duration or involved small numbers of individuals. However, these studies have shown that tracking marine megafauna in Ireland can be successful and that there is great potential for biotelemetry. This project (Grant-Aid Agreement No. PBA/ME/07/005(02)) was carried out under the Sea Change Strategy with the support of the Marine Institute and the Marine Research Sub-Programme of the National Development Plan 2007–2013, and through funding from the Department of Arts, Heritage and the Gaeltacht. Funder: Marine Institute