Thyroid status is related to migratory behavior in Anguilla anguilla glass eels
To 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: f...
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ftunivmassamh:oai:scholarworks.umass.edu:fishpassage_journal_articles-2788 2023-05-15T13:26:53+02:00 Thyroid status is related to migratory behavior in Anguilla anguilla glass eels Edeline, E Dufour, S Briand, C Fatin, D Elie, P 2004-01-01T08:00:00Z https://scholarworks.umass.edu/fishpassage_journal_articles/1788 unknown ScholarWorks@UMass Amherst https://scholarworks.umass.edu/fishpassage_journal_articles/1788 Journal Articles active activity Anguilla Anguilla anguilla behavior behaviour COLONIZATION DAM eel eel ladder eels estuaries estuarine estuary FRANCE Glass eel habitat habitats hormone marine migratory migratory behavior PHYSIOLOGICAL STRESS RATIO rhythm river SECRETORY ACTIVITY status stream streams stress swimming thyroid thyroxine tide Tides trap text 2004 ftunivmassamh 2022-01-09T19:38:47Z To 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. Text Anguilla anguilla University of Massachusetts: ScholarWorks@UMass Amherst |
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Open Polar |
collection |
University of Massachusetts: ScholarWorks@UMass Amherst |
op_collection_id |
ftunivmassamh |
language |
unknown |
topic |
active activity Anguilla Anguilla anguilla behavior behaviour COLONIZATION DAM eel eel ladder eels estuaries estuarine estuary FRANCE Glass eel habitat habitats hormone marine migratory migratory behavior PHYSIOLOGICAL STRESS RATIO rhythm river SECRETORY ACTIVITY status stream streams stress swimming thyroid thyroxine tide Tides trap |
spellingShingle |
active activity Anguilla Anguilla anguilla behavior behaviour COLONIZATION DAM eel eel ladder eels estuaries estuarine estuary FRANCE Glass eel habitat habitats hormone marine migratory migratory behavior PHYSIOLOGICAL STRESS RATIO rhythm river SECRETORY ACTIVITY status stream streams stress swimming thyroid thyroxine tide Tides trap Edeline, E Dufour, S Briand, C Fatin, D Elie, P Thyroid status is related to migratory behavior in Anguilla anguilla glass eels |
topic_facet |
active activity Anguilla Anguilla anguilla behavior behaviour COLONIZATION DAM eel eel ladder eels estuaries estuarine estuary FRANCE Glass eel habitat habitats hormone marine migratory migratory behavior PHYSIOLOGICAL STRESS RATIO rhythm river SECRETORY ACTIVITY status stream streams stress swimming thyroid thyroxine tide Tides trap |
description |
To 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. |
format |
Text |
author |
Edeline, E Dufour, S Briand, C Fatin, D Elie, P |
author_facet |
Edeline, E Dufour, S Briand, C Fatin, D Elie, P |
author_sort |
Edeline, E |
title |
Thyroid status is related to migratory behavior in Anguilla anguilla glass eels |
title_short |
Thyroid status is related to migratory behavior in Anguilla anguilla glass eels |
title_full |
Thyroid status is related to migratory behavior in Anguilla anguilla glass eels |
title_fullStr |
Thyroid status is related to migratory behavior in Anguilla anguilla glass eels |
title_full_unstemmed |
Thyroid status is related to migratory behavior in Anguilla anguilla glass eels |
title_sort |
thyroid status is related to migratory behavior in anguilla anguilla glass eels |
publisher |
ScholarWorks@UMass Amherst |
publishDate |
2004 |
url |
https://scholarworks.umass.edu/fishpassage_journal_articles/1788 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Journal Articles |
op_relation |
https://scholarworks.umass.edu/fishpassage_journal_articles/1788 |
_version_ |
1766395026144755712 |