Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 286:261-267 (2005) - doi:10.3354/meps286261 Swimming depths of offshore migrating longfin eels Anguilla dieffenbachii Donald Jellyman1,*, Katsumi Tsukamoto2 1National Institute of Water and Atmospheric Research, PO Box 8602, Christchurch, New Zealand2Ocean Research Institute, University of Tokyo, Minamidai, Nakano-ku, Tokyo 164-8639, Japan *Email: d.jellyman@niwa.co.nz ABSTRACT: Pop-up tags were attached to 10 migratory female longfin eels Anguilla dieffenbachii, ranging in size from 6000 to 10550 g. Tags were scheduled to ascend at monthly intervals, commencing 3 mo after release. A combination of eel mortality, tag failure, and premature detachment meant that limited data were retrieved. The 3 eels where tags remained attached for 25 d or more generally swam too deep for light reception and hence geolocation estimates, meaning that no tracks of their swimming routes could be determined; all 3 eels showed diel vertical movements with 1 fish always returning to near surface depths (1 to 10 m), while the other 2 tended to ascend to 150-200 m but frequently dived to >600 m; maximum recorded depth was 980 m. It was assumed that such extensive diel movement was in response to predator avoidance and also to thermoregulation as eels often spent time in 5 to 6°C water. The tag from one of these eels commenced transmissions at a location 700 km east of New Caledonia.This is the first evidence that this species moves to the tropics during spawning migrations. KEY WORDS: Freshwater eel · Anguilla dieffenbachii · Swimming depth · Satellite Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 286. Online publication date: February 02, 2005 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2005 Inter-Research.
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