Conservation of endemic landlocked salmonids in regulated rivers: a case‐study from Lake Vänern, Sweden
Abstract Conservation of migratory salmonids requires understanding their ecology at multiple scales, combined with assessing anthropogenic impacts. We present a case‐study from over 100 years of data for the endemic landlocked Atlantic salmon ( Salmo salar , Salmonidae) and brown trout ( Salmo trut...
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crwiley:10.1111/j.1467-2979.2011.00437.x 2024-09-09T19:30:48+00:00 Conservation of endemic landlocked salmonids in regulated rivers: a case‐study from Lake Vänern, Sweden Piccolo, John J Norrgård, Johnny R Greenberg, Larry A Schmitz, Monika Bergman, Eva 2011 http://dx.doi.org/10.1111/j.1467-2979.2011.00437.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1467-2979.2011.00437.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1467-2979.2011.00437.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Fish and Fisheries volume 13, issue 4, page 418-433 ISSN 1467-2960 1467-2979 journal-article 2011 crwiley https://doi.org/10.1111/j.1467-2979.2011.00437.x 2024-06-20T04:22:36Z Abstract Conservation of migratory salmonids requires understanding their ecology at multiple scales, combined with assessing anthropogenic impacts. We present a case‐study from over 100 years of data for the endemic landlocked Atlantic salmon ( Salmo salar , Salmonidae) and brown trout ( Salmo trutta , Salmonidae) in Lake Vänern, Sweden. We use this case‐study to develop life history‐based research and monitoring priorities for migratory salmonids. In Vänern, small wild populations of salmon and trout remain only in the heavily regulated Rivers Klar (Klarälven) and Gullspång (Gullspångsälven), and commercial and sport fisheries are maintained by hatchery stocking. These populations represent some of the last remaining large‐bodied (up to 20 kg) landlocked salmon stocks worldwide. We found that one of four stocks of wild fish has increased since 1996; the other three remain critically low. Hatchery return rates for three of four stocks appear stable at roughly 1% and annual fisheries catch is roughly 75 metric tons, with an estimated 7.5% of hatchery smolts being recruited to the fishery; this also appears relatively stable since 1990. Our analysis reveals much uncertainty in key data requirements, including both river return and fisheries catch rates, estimates of wild smolt production and survival, and hatchery breeding and genetics protocols. These uncertainties, coupled with a lack of information on their riverine and lacustrine ecology, preclude effective management of these unique populations. We conclude with a framework for a life history‐based approach to research and monitoring for Vänern salmon and trout, which should be applicable for all endemic, migratory salmonid populations. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Fish and Fisheries 13 4 418 433 |
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Wiley Online Library |
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English |
description |
Abstract Conservation of migratory salmonids requires understanding their ecology at multiple scales, combined with assessing anthropogenic impacts. We present a case‐study from over 100 years of data for the endemic landlocked Atlantic salmon ( Salmo salar , Salmonidae) and brown trout ( Salmo trutta , Salmonidae) in Lake Vänern, Sweden. We use this case‐study to develop life history‐based research and monitoring priorities for migratory salmonids. In Vänern, small wild populations of salmon and trout remain only in the heavily regulated Rivers Klar (Klarälven) and Gullspång (Gullspångsälven), and commercial and sport fisheries are maintained by hatchery stocking. These populations represent some of the last remaining large‐bodied (up to 20 kg) landlocked salmon stocks worldwide. We found that one of four stocks of wild fish has increased since 1996; the other three remain critically low. Hatchery return rates for three of four stocks appear stable at roughly 1% and annual fisheries catch is roughly 75 metric tons, with an estimated 7.5% of hatchery smolts being recruited to the fishery; this also appears relatively stable since 1990. Our analysis reveals much uncertainty in key data requirements, including both river return and fisheries catch rates, estimates of wild smolt production and survival, and hatchery breeding and genetics protocols. These uncertainties, coupled with a lack of information on their riverine and lacustrine ecology, preclude effective management of these unique populations. We conclude with a framework for a life history‐based approach to research and monitoring for Vänern salmon and trout, which should be applicable for all endemic, migratory salmonid populations. |
format |
Article in Journal/Newspaper |
author |
Piccolo, John J Norrgård, Johnny R Greenberg, Larry A Schmitz, Monika Bergman, Eva |
spellingShingle |
Piccolo, John J Norrgård, Johnny R Greenberg, Larry A Schmitz, Monika Bergman, Eva Conservation of endemic landlocked salmonids in regulated rivers: a case‐study from Lake Vänern, Sweden |
author_facet |
Piccolo, John J Norrgård, Johnny R Greenberg, Larry A Schmitz, Monika Bergman, Eva |
author_sort |
Piccolo, John J |
title |
Conservation of endemic landlocked salmonids in regulated rivers: a case‐study from Lake Vänern, Sweden |
title_short |
Conservation of endemic landlocked salmonids in regulated rivers: a case‐study from Lake Vänern, Sweden |
title_full |
Conservation of endemic landlocked salmonids in regulated rivers: a case‐study from Lake Vänern, Sweden |
title_fullStr |
Conservation of endemic landlocked salmonids in regulated rivers: a case‐study from Lake Vänern, Sweden |
title_full_unstemmed |
Conservation of endemic landlocked salmonids in regulated rivers: a case‐study from Lake Vänern, Sweden |
title_sort |
conservation of endemic landlocked salmonids in regulated rivers: a case‐study from lake vänern, sweden |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1111/j.1467-2979.2011.00437.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1467-2979.2011.00437.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1467-2979.2011.00437.x |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Fish and Fisheries volume 13, issue 4, page 418-433 ISSN 1467-2960 1467-2979 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1467-2979.2011.00437.x |
container_title |
Fish and Fisheries |
container_volume |
13 |
container_issue |
4 |
container_start_page |
418 |
op_container_end_page |
433 |
_version_ |
1809899781632294912 |