If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Age-dependent distribution of juvenile southern bluefin tuna (Thunnus maccoyii) on the continental shelf off southwest Australia determined by acoustic monitoring

$48.00 plus tax (Refund Policy)

Download / Buy Article:

Abstract:

Abstract

Juvenile southern bluefin tuna (Thunnus maccoyii, SBT) were monitored in nearshore waters off southwest Australia using acoustic tagging and monitoring over five austral summers (2002/2003–2006/2007) to determine patterns in age-based distribution of SBT. A total of 20–70 receivers were deployed in early December along one to three cross-shelf transects and at three inshore topographic features (lumps) where SBT are known to occur; and a total of 59–84 juvenile SBT (41–90 cm fork length) were tagged and released each year. After several months, receivers were recovered, and data extracted. In 2002/2003 and 2003/2004, 2-yr-old SBT were detected more frequently in nearshore areas than did 1-yr old fish. Similarly in 2004/2005 and 2006/2007, it was the larger 1-yr-old SBT that were detected more frequently at inshore lumps (>85% of detections) while small 1-yr-old SBT were detected more widely over the study area. In 2005/2006, although large 1-yr-old SBT were still detected more frequently at inshore lumps than small 1-yr old SBT, the percentage of all detections at lumps was lower at 31.5%, indicating wider distribution of both small and large age-1 fish. The observed age-dependent distribution pattern may be enhanced by the distribution of prey, which disperse or concentrate depending on the local oceanography.

Keywords: acoustic tag; inshore lumps; size/age-dependent distribution; southern bluefin tuna; southwest Australia

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1365-2419.2010.00534.x

Affiliations: 1: Wealth from Oceans National Research Flagship, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart, Tas. 7001, Australia 2: Institute for East China Sea Research, Nagasaki University, 1551-7 Taira-machi, Nagasaki, Nagasaki 851-2213, Japan 3: Akkeshi Marine Station, Aquatic Research Station, Field Science Center for Northern Biosphere, Hokkaido University, Aikappu, Akkeshi-cho, Akkeshi, Hokkaido 088-1113, Japan 4: Graduate School of Science and Technology, Nagasaki University, 1551-7 Taira-machi, Nagasaki, Nagasaki 851-2213, Japan 5: National Research Institute of Fisheries Engineering, Fisheries Research Agency, Ebidai, Hasaki, Kamishima-gun, Ibaraki 314-0421, Japan 6: Field Science Center for Northern Biosphere, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido 041-8611, Japan

Publication date: March 1, 2010

Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more