Publication:
Thyroid status is related to migratory behavior in Anguilla anguilla glass eels

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dc.contributor.authorEdeline, E
dc.contributor.authorDufour, S
dc.contributor.authorBriand, C
dc.contributor.authorFatin, D
dc.contributor.authorElie, P
dc.date2023-09-23T06:55:35.000
dc.date.accessioned2024-04-26T17:18:41Z
dc.date.available2024-04-26T17:18:41Z
dc.date.issued2004-01-01
dc.description.abstractTo determine whether thyroidal status is related to migratory and settling behaviour in Anguilla anguilla glass eels, we sampled glass eels showing different migratory behaviours in the Arzal dam, which constitutes the tidal limit of the Vilaine River (France). We collected 4 groups of glass eels: flood and ebb tide glass eels were netted in the estuary during the flood and ebb tides, respectively, trap glass eels were sampled from the eel ladder trap, and bottom glass eels sheltering on the bottom of the estuary during flood tide. We measured individual whole-body triiodothyronine (T-3) and thyroxine (T-4) levels for these groups, and calculated total thyroid hormone (TH) levels as T-3 + T-4 contents reflecting the thyroid gland secretory activity, and T-3:T-4 ratios reflecting T-4 outer-ring desiodase (T-4 ORD) activity. Trap glass eels had the highest TH levels, indicating an activation of the thyroid gland via the thyreotrop axis. This could be responsible for the behavioural transition (loss of circatidal rhythm and switch to counter-current swimming) at the tidal limit and active colonization of river habitats by glass eels. Ebb and flood tide glass eels had similar TH levels that were lower than those of trap glass eels, indicating a lower thyroid gland secretory activity in the former. Ebb tide glass eels had higher T3:T4 ratios than flood tide and trap glass eels, indicating physiological stress related to inefficient use of tidal streams. Bottom glass eels had the lowest TH levels, and high T3:T4 ratios similar to those of ebb tide glass eels; this suggests that physiological stress induced by frequent counter-current swimming leads to precocious settlement of glass eels in estuarine habitats. Our data supports the critical role of the thyroid status in the migratory and settling behaviour of glass eels in estuarine and marine habitats.
dc.description.pages261-270
dc.identifier.urihttps://hdl.handle.net/20.500.14394/26923
dc.relation.ispartofMarine Ecology Progress Series
dc.source.issue282
dc.source.statuspublished
dc.subjectactive
dc.subjectactivity
dc.subjectAnguilla
dc.subjectAnguilla anguilla
dc.subjectbehavior
dc.subjectbehaviour
dc.subjectCOLONIZATION
dc.subjectDAM
dc.subjecteel
dc.subjecteel ladder
dc.subjecteels
dc.subjectestuaries
dc.subjectestuarine
dc.subjectestuary
dc.subjectFRANCE
dc.subjectGlass eel
dc.subjecthabitat
dc.subjecthabitats
dc.subjecthormone
dc.subjectmarine
dc.subjectmigratory
dc.subjectmigratory behavior
dc.subjectPHYSIOLOGICAL STRESS
dc.subjectRATIO
dc.subjectrhythm
dc.subjectriver
dc.subjectSECRETORY ACTIVITY
dc.subjectstatus
dc.subjectstream
dc.subjectstreams
dc.subjectstress
dc.subjectswimming
dc.subjectthyroid
dc.subjectthyroxine
dc.subjecttide
dc.subjectTides
dc.subjecttrap
dc.titleThyroid status is related to migratory behavior in Anguilla anguilla glass eels
dc.typearticle
dc.typearticle
digcom.contributor.authorEdeline, E
digcom.contributor.authorDufour, S
digcom.contributor.authorBriand, C
digcom.contributor.authorFatin, D
digcom.contributor.authorElie, P
digcom.identifierfishpassage_journal_articles/1788
digcom.identifier.contextkey2757485
digcom.identifier.submissionpathfishpassage_journal_articles/1788
dspace.entity.typePublication
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