The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr
Abstract Stocking with eggs has been widely used as a management measure to support degraded salmonid stocks. In Finland, Atlantic salmon and both sea-migrating and lake-migrating brown trout are stocked as eggs, alevins, fry, parr, and smolt, whereas trout are also stocked as mature fish. The aim o...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsv017 http://academic.oup.com/icesjms/article-pdf/72/5/1389/31227220/fsv017.pdf |
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croxfordunivpr:10.1093/icesjms/fsv017 2024-06-23T07:51:26+00:00 The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr Syrjänen, Jukka Tapani Ruokonen, Timo Juhani Ketola, Tarmo Valkeajärvi, Pentti 2015 http://dx.doi.org/10.1093/icesjms/fsv017 http://academic.oup.com/icesjms/article-pdf/72/5/1389/31227220/fsv017.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 72, issue 5, page 1389-1398 ISSN 1095-9289 1054-3139 journal-article 2015 croxfordunivpr https://doi.org/10.1093/icesjms/fsv017 2024-06-11T04:21:13Z Abstract Stocking with eggs has been widely used as a management measure to support degraded salmonid stocks. In Finland, Atlantic salmon and both sea-migrating and lake-migrating brown trout are stocked as eggs, alevins, fry, parr, and smolt, whereas trout are also stocked as mature fish. The aim of this stocking is to improve catches and to support collapsed spawning stocks. We assessed the success of stocking with brown trout eggs in a study of 17 Finnish boreal forest rivers, of which 9 were subject to egg stocking. All rivers contained some naturally spawning trout. In 16 rivers, including non-stocking years and unstocked rivers, egg stocking did not increase the total (wild and stocked) density of 0-year-old parr. However, those rivers with higher existing trout densities in non-stocking years seemed to benefit most from stocking, suggesting some role of river-specific extrinsic factors affecting egg-to-parr survival. In one river monitored for 14 years, only a weak correlation was found between the total density of 0-year-old parr and the number of eggs stocked. However, in nine parr samples from five rivers, the mean proportion of parr derived from stocked eggs was 40%. The mean survival to first autumn parr of egg-stocked and wild individuals was 1.0 and 3.3%, respectively. Probable reasons for the detected low to moderate impact of egg-stocking are (i) large variation in total parr density between years and rivers, (ii) small number of stocked eggs, (iii) placing egg boxes and egg pockets in unsuitable microhabitats, and (iv) unsuitable emergence time of egg-stocked individuals, or other extrinsic factors creating extra mortality. We recommend field and laboratory experiments to improve and standardize stocking methods, and monitoring the connection of wild spawning stocks and parr recruitment. Finally, we encourage fishery authorities to create clear management goals for threatened wild salmonid stocks. Article in Journal/Newspaper Atlantic salmon Oxford University Press ICES Journal of Marine Science 72 5 1389 1398 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract Stocking with eggs has been widely used as a management measure to support degraded salmonid stocks. In Finland, Atlantic salmon and both sea-migrating and lake-migrating brown trout are stocked as eggs, alevins, fry, parr, and smolt, whereas trout are also stocked as mature fish. The aim of this stocking is to improve catches and to support collapsed spawning stocks. We assessed the success of stocking with brown trout eggs in a study of 17 Finnish boreal forest rivers, of which 9 were subject to egg stocking. All rivers contained some naturally spawning trout. In 16 rivers, including non-stocking years and unstocked rivers, egg stocking did not increase the total (wild and stocked) density of 0-year-old parr. However, those rivers with higher existing trout densities in non-stocking years seemed to benefit most from stocking, suggesting some role of river-specific extrinsic factors affecting egg-to-parr survival. In one river monitored for 14 years, only a weak correlation was found between the total density of 0-year-old parr and the number of eggs stocked. However, in nine parr samples from five rivers, the mean proportion of parr derived from stocked eggs was 40%. The mean survival to first autumn parr of egg-stocked and wild individuals was 1.0 and 3.3%, respectively. Probable reasons for the detected low to moderate impact of egg-stocking are (i) large variation in total parr density between years and rivers, (ii) small number of stocked eggs, (iii) placing egg boxes and egg pockets in unsuitable microhabitats, and (iv) unsuitable emergence time of egg-stocked individuals, or other extrinsic factors creating extra mortality. We recommend field and laboratory experiments to improve and standardize stocking methods, and monitoring the connection of wild spawning stocks and parr recruitment. Finally, we encourage fishery authorities to create clear management goals for threatened wild salmonid stocks. |
format |
Article in Journal/Newspaper |
author |
Syrjänen, Jukka Tapani Ruokonen, Timo Juhani Ketola, Tarmo Valkeajärvi, Pentti |
spellingShingle |
Syrjänen, Jukka Tapani Ruokonen, Timo Juhani Ketola, Tarmo Valkeajärvi, Pentti The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr |
author_facet |
Syrjänen, Jukka Tapani Ruokonen, Timo Juhani Ketola, Tarmo Valkeajärvi, Pentti |
author_sort |
Syrjänen, Jukka Tapani |
title |
The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr |
title_short |
The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr |
title_full |
The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr |
title_fullStr |
The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr |
title_full_unstemmed |
The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr |
title_sort |
relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr |
publisher |
Oxford University Press (OUP) |
publishDate |
2015 |
url |
http://dx.doi.org/10.1093/icesjms/fsv017 http://academic.oup.com/icesjms/article-pdf/72/5/1389/31227220/fsv017.pdf |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
ICES Journal of Marine Science volume 72, issue 5, page 1389-1398 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1093/icesjms/fsv017 |
container_title |
ICES Journal of Marine Science |
container_volume |
72 |
container_issue |
5 |
container_start_page |
1389 |
op_container_end_page |
1398 |
_version_ |
1802642531246145536 |