Evidence for non‐random spatial positioning of migrating smolts (Salmonidae) in a small lowland stream
Summary 1. The ontogenetic development of anadromous salmonids includes downstream emigration of immature individuals from freshwater towards the marine environment. Although this migration of juvenile salmonids (smolts) may be associated with severe mortalities, only limited attention has been paid...
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crwiley:10.1111/j.1365-2427.2007.01743.x 2024-06-02T08:03:31+00:00 Evidence for non‐random spatial positioning of migrating smolts (Salmonidae) in a small lowland stream SVENDSEN, JON C. ESKESEN, ALLAN O. AARESTRUP, KIM KOED, ANDERS JORDAN, ANDERS D. 2007 http://dx.doi.org/10.1111/j.1365-2427.2007.01743.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2427.2007.01743.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2427.2007.01743.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Freshwater Biology volume 52, issue 6, page 1147-1158 ISSN 0046-5070 1365-2427 journal-article 2007 crwiley https://doi.org/10.1111/j.1365-2427.2007.01743.x 2024-05-03T11:03:08Z Summary 1. The ontogenetic development of anadromous salmonids includes downstream emigration of immature individuals from freshwater towards the marine environment. Although this migration of juvenile salmonids (smolts) may be associated with severe mortalities, only limited attention has been paid to the spatial positioning of smolts in small streams. 2. Using a novel approach, this study examined the vertical and horizontal positioning of brown trout and Atlantic salmon smolts while performing downstream migration in a small lowland stream. 3. Pre‐smolts of indigenous and hatchery‐reared (F1) brown trout ( Salmo trutta ), and two different populations of Atlantic salmon ( S. salar ), were tagged with passive integrated transponder (PIT) tags and subsequently released upstream of an antenna array consisting of five circular swim‐through PIT antennas. Antennas were positioned in order to determine whether the migrating smolts were bottom or surface oriented, and if they were oriented towards the mid‐channel or the stream bank. 4. During the smolt emigration period, data describing both the detection of the migrating fish and the amount of water passing through the antennas were collected. This was accomplished in order to determine if the fish were performing active positioning behaviour independently of the vertical and horizontal discharge distributions in the stream. 5. The results showed that the smolts migrated in a non‐random spatial pattern independently of the stream discharge distributions. Vertically, the indigenous brown trout and the Atlantic salmon demonstrated a preference for the bottom orientated positions. In contrast, the distribution of the F1 brown trout was not different from the discharge distribution. The latter observation suggests random vertical positioning, which may be indicative of inferior migratory performance. Horizontally, all tested smolt populations strongly preferred the mid‐channel positions. 6. The discharge‐corrected preferences for certain spatial positions suggest that ... Article in Journal/Newspaper Atlantic salmon Wiley Online Library Freshwater Biology 52 6 1147 1158 |
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Wiley Online Library |
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crwiley |
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English |
description |
Summary 1. The ontogenetic development of anadromous salmonids includes downstream emigration of immature individuals from freshwater towards the marine environment. Although this migration of juvenile salmonids (smolts) may be associated with severe mortalities, only limited attention has been paid to the spatial positioning of smolts in small streams. 2. Using a novel approach, this study examined the vertical and horizontal positioning of brown trout and Atlantic salmon smolts while performing downstream migration in a small lowland stream. 3. Pre‐smolts of indigenous and hatchery‐reared (F1) brown trout ( Salmo trutta ), and two different populations of Atlantic salmon ( S. salar ), were tagged with passive integrated transponder (PIT) tags and subsequently released upstream of an antenna array consisting of five circular swim‐through PIT antennas. Antennas were positioned in order to determine whether the migrating smolts were bottom or surface oriented, and if they were oriented towards the mid‐channel or the stream bank. 4. During the smolt emigration period, data describing both the detection of the migrating fish and the amount of water passing through the antennas were collected. This was accomplished in order to determine if the fish were performing active positioning behaviour independently of the vertical and horizontal discharge distributions in the stream. 5. The results showed that the smolts migrated in a non‐random spatial pattern independently of the stream discharge distributions. Vertically, the indigenous brown trout and the Atlantic salmon demonstrated a preference for the bottom orientated positions. In contrast, the distribution of the F1 brown trout was not different from the discharge distribution. The latter observation suggests random vertical positioning, which may be indicative of inferior migratory performance. Horizontally, all tested smolt populations strongly preferred the mid‐channel positions. 6. The discharge‐corrected preferences for certain spatial positions suggest that ... |
format |
Article in Journal/Newspaper |
author |
SVENDSEN, JON C. ESKESEN, ALLAN O. AARESTRUP, KIM KOED, ANDERS JORDAN, ANDERS D. |
spellingShingle |
SVENDSEN, JON C. ESKESEN, ALLAN O. AARESTRUP, KIM KOED, ANDERS JORDAN, ANDERS D. Evidence for non‐random spatial positioning of migrating smolts (Salmonidae) in a small lowland stream |
author_facet |
SVENDSEN, JON C. ESKESEN, ALLAN O. AARESTRUP, KIM KOED, ANDERS JORDAN, ANDERS D. |
author_sort |
SVENDSEN, JON C. |
title |
Evidence for non‐random spatial positioning of migrating smolts (Salmonidae) in a small lowland stream |
title_short |
Evidence for non‐random spatial positioning of migrating smolts (Salmonidae) in a small lowland stream |
title_full |
Evidence for non‐random spatial positioning of migrating smolts (Salmonidae) in a small lowland stream |
title_fullStr |
Evidence for non‐random spatial positioning of migrating smolts (Salmonidae) in a small lowland stream |
title_full_unstemmed |
Evidence for non‐random spatial positioning of migrating smolts (Salmonidae) in a small lowland stream |
title_sort |
evidence for non‐random spatial positioning of migrating smolts (salmonidae) in a small lowland stream |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.1365-2427.2007.01743.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2427.2007.01743.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2427.2007.01743.x |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Freshwater Biology volume 52, issue 6, page 1147-1158 ISSN 0046-5070 1365-2427 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2427.2007.01743.x |
container_title |
Freshwater Biology |
container_volume |
52 |
container_issue |
6 |
container_start_page |
1147 |
op_container_end_page |
1158 |
_version_ |
1800748061867114496 |