A Stock Assessment of Atlantic salmon in Large Riverine Catchments
Large river systems can be challenging in relation to stock assessment and catchment management, especially those large rivers with numerous or important tributaries that may contain sub-populations or stocks. Initial testing of existing counter technology (resistivity, infra-red and split-beam hydr...
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ftnuigalway:oai:aran.library.nuigalway.ie/:10379/3517 2023-06-11T04:10:14+02:00 A Stock Assessment of Atlantic salmon in Large Riverine Catchments Brennan, Louise O. Henry, Tiernan Marine Institute-Marine RTDI Measures Productive Sector Operational Programme NDP 2000-2006 2013-04 http://hdl.handle.net/10379/3517 unknown http://hdl.handle.net/10379/3517 Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ Large rivers Atlantic salmon Stock assessment DIDSON Earth & Ocean Sciences Thesis 2013 ftnuigalway 2023-05-28T18:03:38Z Large river systems can be challenging in relation to stock assessment and catchment management, especially those large rivers with numerous or important tributaries that may contain sub-populations or stocks. Initial testing of existing counter technology (resistivity, infra-red and split-beam hydroacoustics) in such a system - the River Moy, Co. Mayo - highlighted the difficulties in their use and operation. In this study, an alternative hydroacoustic system, DIDSON (Dual-frequency Identification Sonar), was deployed and assessed for the first time in Ireland. The DIDSON's near video quality imagery allowed for observations of fish migrations and it was easy to install and operate. Methodologies for the operation and data processing using DIDSON in Irish rivers for counting Atlantic salmon have been established, including software development of DIDSON SMC Software (SoundMetrics) (e.g. CSOT Analysis), allowing for the acquisition of real time data and quality fish length measurements. As an alternative to adult counts, mark-recapture estimates were successfully carried out on Atlantic salmon smolts on the River Deel (a tributary of the River Moy) using a screw trap. Both classic and Bayesian models were successfully applied. These stock assessment data were also used to determine the main environmental influences on Atlantic salmon migration in the River Deel. While air and water temperature were shown to be significant to adult migration, no direct correlations were determined with smolt migration. The combined use of DIDSON and Genetic Stock Identification was developed for salmon stock assessment. The genetically determined proportion of River Deel fish were used, along with the DIDSON count, to provide the first estimate of a large river system, the River Moy, using this unique methodology. This advance in stock assessment methodology allowed for a stock assessment of all discrete populations within a large river system. Thesis Atlantic salmon National University of Ireland (NUI), Galway: ARAN |
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National University of Ireland (NUI), Galway: ARAN |
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ftnuigalway |
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unknown |
topic |
Large rivers Atlantic salmon Stock assessment DIDSON Earth & Ocean Sciences |
spellingShingle |
Large rivers Atlantic salmon Stock assessment DIDSON Earth & Ocean Sciences Brennan, Louise O. A Stock Assessment of Atlantic salmon in Large Riverine Catchments |
topic_facet |
Large rivers Atlantic salmon Stock assessment DIDSON Earth & Ocean Sciences |
description |
Large river systems can be challenging in relation to stock assessment and catchment management, especially those large rivers with numerous or important tributaries that may contain sub-populations or stocks. Initial testing of existing counter technology (resistivity, infra-red and split-beam hydroacoustics) in such a system - the River Moy, Co. Mayo - highlighted the difficulties in their use and operation. In this study, an alternative hydroacoustic system, DIDSON (Dual-frequency Identification Sonar), was deployed and assessed for the first time in Ireland. The DIDSON's near video quality imagery allowed for observations of fish migrations and it was easy to install and operate. Methodologies for the operation and data processing using DIDSON in Irish rivers for counting Atlantic salmon have been established, including software development of DIDSON SMC Software (SoundMetrics) (e.g. CSOT Analysis), allowing for the acquisition of real time data and quality fish length measurements. As an alternative to adult counts, mark-recapture estimates were successfully carried out on Atlantic salmon smolts on the River Deel (a tributary of the River Moy) using a screw trap. Both classic and Bayesian models were successfully applied. These stock assessment data were also used to determine the main environmental influences on Atlantic salmon migration in the River Deel. While air and water temperature were shown to be significant to adult migration, no direct correlations were determined with smolt migration. The combined use of DIDSON and Genetic Stock Identification was developed for salmon stock assessment. The genetically determined proportion of River Deel fish were used, along with the DIDSON count, to provide the first estimate of a large river system, the River Moy, using this unique methodology. This advance in stock assessment methodology allowed for a stock assessment of all discrete populations within a large river system. |
author2 |
Henry, Tiernan Marine Institute-Marine RTDI Measures Productive Sector Operational Programme NDP 2000-2006 |
format |
Thesis |
author |
Brennan, Louise O. |
author_facet |
Brennan, Louise O. |
author_sort |
Brennan, Louise O. |
title |
A Stock Assessment of Atlantic salmon in Large Riverine Catchments |
title_short |
A Stock Assessment of Atlantic salmon in Large Riverine Catchments |
title_full |
A Stock Assessment of Atlantic salmon in Large Riverine Catchments |
title_fullStr |
A Stock Assessment of Atlantic salmon in Large Riverine Catchments |
title_full_unstemmed |
A Stock Assessment of Atlantic salmon in Large Riverine Catchments |
title_sort |
stock assessment of atlantic salmon in large riverine catchments |
publishDate |
2013 |
url |
http://hdl.handle.net/10379/3517 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
http://hdl.handle.net/10379/3517 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ |
_version_ |
1768384528321085440 |