Repeated Vertical Movements Of Mature Anguillid Eels In A Lake

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dc.contributor.authorYuuki Y., Watanabe
dc.contributor.authorTakaomi, Arai
dc.contributor.authorDaniel, Limbong
dc.contributor.authorYunober, Mberato
dc.contributor.authorNobuyuki, Miyazaki
dc.date.accessioned2017-05-21T08:37:51Z
dc.date.available2017-05-21T08:37:51Z
dc.date.issued2016
dc.description.abstractReproductive migration is a critical phase in the life history of anguillid eels. Nevertheless, fine-scale behaviours of migrating eels remain unknown, primarily due to the difficulty in attaching high-resolution recording devices to, and recovering them from, these small-sized teleosts. We attached a small accelerometer with time-scheduled release system to mature Anguilla celebesensis and A. marmorata in Lake Poso, Indonesia, during the pre-migration period. The eels repeated up-and-down movements in the water column (maximum depth, 77m), with slower, less active descents at shallower pitch angles, followed by faster, more active ascents at steeper pitch angles. The asymmetric diving pattern indicates negative buoyancy of the eels, which was confirmed by the measurements of body densities. The repeated diving is unlikely to represent foraging or thermoregulation because mature eels are thought to fast and water temperature changed little with depth. We suggest that the repeated diving is a result of the eels' internal motivation for continuous swimming in preparation for oceanic migration, and is possibly energetically more efficient than if they keep swimming at a certain depth. The swimming energetics of eels in nature might be more complicated than previously thought because of the effect of vertical movements and non-neutral buoyancyen_US
dc.identifier.citationVol.67;Issue 10;1569-1574 p.en_US
dc.identifier.issn13231650
dc.identifier.urihttp://hdl.handle.net/123456789/5959
dc.language.isoenen_US
dc.publisherMarine and Freshwater Researchen_US
dc.subjectAnguilla celebesensisen_US
dc.subjectAnguilla marmorataen_US
dc.subjectAnguillidaeen_US
dc.subjectTeleosteien_US
dc.titleRepeated Vertical Movements Of Mature Anguillid Eels In A Lakeen_US
dc.typeArticleen_US
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