@article {Akamatsu:2005:0025-3324:3,
title = "New Stereo Acoustic Data Logger for Free-ranging Dolphins and Porpoises",
journal = "Marine Technology Society Journal",
parent_itemid = "infobike://mts/mtsj",
publishercode ="mts",
year = "2005",
volume = "39",
number = "2",
publication date ="2005-06-01T00:00:00",
pages = "3-9",
itemtype = "ARTICLE",
issn = "0025-3324",
url = "https://www.ingentaconnect.com/content/mts/mtsj/2005/00000039/00000002/art00001",
doi = "doi:10.4031/002533205787443980",
author = "Akamatsu, Tomonari and Matsuda, Akihiko and Suzuki, Shiro and Wang, Ding and Wang, Kexiong and Suzuki, Michihiko and Muramoto, Hiroyuki and Sugiyama, Naoki and Oota, Katsunori",
abstract = "To observe the bio-sonar behavior of dolphins and porpoises, a miniature stereo acoustic data logger was developed to record the echolocation clicks of small cetaceans. The 'A-tag' device is small enough to be attached to a dolphin or porpoise. A-tag can record the sonar pulse intensity, precise inter-click-intervals, and time difference between sounds arriving at two different hydrophones. The A-tag works for up to 60 hours continuously and allows observation of the sonar target range of free-ranging odontocetes. The time of arrival at the two hydrophones on the tag allows vocalizations from nearby individuals to be identified. A less invasive tagging technique using a suction cup was also developed. A mean attachment time of 15 hours was obtained on free-ranging finless porpoises in a freshwater system in China. The A-tag proved to be a useful tool for investigating the underwater echolocation behavior of odontocetes.",
}