Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France
The resilience of sea trout populations is increasingly concerning, with evidence of major demographic changes in some populations. Based on trapping data and related scale collection, we analysed long-term changes in body length of a sea trout population in the Bresle River, France. From 1984-2022,...
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2024-04-01
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| Online Access: | https://peercommunityjournal.org/articles/10.24072/pcjournal.411/ |
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| author | Josset, Quentin Beaulaton, Laurent Romakkaniemi, Atso Nevoux, Marie |
| author_facet | Josset, Quentin Beaulaton, Laurent Romakkaniemi, Atso Nevoux, Marie |
| author_sort | Josset, Quentin |
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| description | The resilience of sea trout populations is increasingly concerning, with evidence of major demographic changes in some populations. Based on trapping data and related scale collection, we analysed long-term changes in body length of a sea trout population in the Bresle River, France. From 1984-2022, the length of first-time returning individuals decreased by 1.73 mm.year-1 (SD = 0.08), which resulted in the loss of c. 12.3% of mean body length. This decrease results from a decrease in the age at first return, with a gradual loss of the oldest individuals and an increase in the proportion of the youngest. Timing of the return migration advanced drastically, although shorter sea sojourn had little influence on body length. We found little evidence of a decrease in length-at-age, to the exception of the oldest age class, suggesting that growth conditions at sea might not have deteriorated greatly during the study period. |
| format | Article |
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| institution | Kabale University |
| issn | 2804-3871 |
| language | English |
| publishDate | 2024-04-01 |
| publisher | Peer Community In |
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| spelling | doaj-art-94d0f8c35ac74e0da4c485d5e1be2e5f2025-02-07T10:17:18ZengPeer Community InPeer Community Journal2804-38712024-04-01410.24072/pcjournal.41110.24072/pcjournal.411Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France Josset, Quentin0https://orcid.org/0009-0005-4533-8341Beaulaton, Laurent1https://orcid.org/0000-0002-9614-8602Romakkaniemi, Atso2https://orcid.org/0000-0001-9696-117XNevoux, Marie3https://orcid.org/0000-0003-1451-7732Service conservation et gestion durable des espèces exploitées, Direction de la recherche et de l’appui scientifique, OFB, U3E, Eu, France; Management of Diadromous Fish in their Environment, OFB, INRAE, Institut Agro, Univ Pau & Pays Adour/E2S UPPA, Rennes, FranceService conservation et gestion durable des espèces exploitées, Direction de la recherche et de l’appui scientifique, OFB, U3E, Rennes, France.; Management of Diadromous Fish in their Environment, OFB, INRAE, Institut Agro, Univ Pau & Pays Adour/E2S UPPA, Rennes, FranceNatural Resources Institute Finland, Oulu, FinlandDECOD (Ecosystem Dynamics and Sustainability), INRAE, Institut Agro, IFREMER, Rennes, France; Management of Diadromous Fish in their Environment, OFB, INRAE, Institut Agro, Univ Pau & Pays Adour/E2S UPPA, Rennes, FranceThe resilience of sea trout populations is increasingly concerning, with evidence of major demographic changes in some populations. Based on trapping data and related scale collection, we analysed long-term changes in body length of a sea trout population in the Bresle River, France. From 1984-2022, the length of first-time returning individuals decreased by 1.73 mm.year-1 (SD = 0.08), which resulted in the loss of c. 12.3% of mean body length. This decrease results from a decrease in the age at first return, with a gradual loss of the oldest individuals and an increase in the proportion of the youngest. Timing of the return migration advanced drastically, although shorter sea sojourn had little influence on body length. We found little evidence of a decrease in length-at-age, to the exception of the oldest age class, suggesting that growth conditions at sea might not have deteriorated greatly during the study period.https://peercommunityjournal.org/articles/10.24072/pcjournal.411/age structure, body length, life history, marine growth, migration, sea trout |
| spellingShingle | Josset, Quentin Beaulaton, Laurent Romakkaniemi, Atso Nevoux, Marie Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France Peer Community Journal age structure, body length, life history, marine growth, migration, sea trout |
| title | Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France
|
| title_full | Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France
|
| title_fullStr | Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France
|
| title_full_unstemmed | Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France
|
| title_short | Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France
|
| title_sort | changes in length at first return of a sea trout salmo trutta population in northern france |
| topic | age structure, body length, life history, marine growth, migration, sea trout |
| url | https://peercommunityjournal.org/articles/10.24072/pcjournal.411/ |
| work_keys_str_mv | AT jossetquentin changesinlengthatfirstreturnofaseatroutsalmotruttapopulationinnorthernfrance AT beaulatonlaurent changesinlengthatfirstreturnofaseatroutsalmotruttapopulationinnorthernfrance AT romakkaniemiatso changesinlengthatfirstreturnofaseatroutsalmotruttapopulationinnorthernfrance AT nevouxmarie changesinlengthatfirstreturnofaseatroutsalmotruttapopulationinnorthernfrance |