Movements of dead fish in rivers

Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Havn, T. B. [verfasserIn] Økland, F. Teichert, M. A. K. Heermann, L. Borcherding, J. Sæther, S. A. Tambets, M. Diserud, O. H. Thorstad, E. B.

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2017

Schlagwörter:	Mortality estimate Telemetry Radio tag Atlantic salmon European eel Smolt Silver eel Downstream drift

Anmerkung:	© The Author(s) 2017

Übergeordnetes Werk:	Enthalten in: Animal Biotelemetry - London : BioMed Central, 2013, 5(2017), 1 vom: 23. März
Übergeordnetes Werk:	volume:5 ; year:2017 ; number:1 ; day:23 ; month:03

Links:	Volltext

DOI / URN:	10.1186/s40317-017-0122-2

Katalog-ID:	SPR036925640

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520			\|a Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies.
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allfields	10.1186/s40317-017-0122-2 doi (DE-627)SPR036925640 (SPR)s40317-017-0122-2-e DE-627 ger DE-627 rakwb eng Havn, T. B. verfasserin aut Movements of dead fish in rivers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2017 Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies. Mortality estimate (dpeaa)DE-He213 Telemetry (dpeaa)DE-He213 Radio tag (dpeaa)DE-He213 Atlantic salmon (dpeaa)DE-He213 European eel (dpeaa)DE-He213 Smolt (dpeaa)DE-He213 Silver eel (dpeaa)DE-He213 Downstream drift (dpeaa)DE-He213 Økland, F. aut Teichert, M. A. K. aut Heermann, L. (orcid)0000-0003-4620-4087 aut Borcherding, J. (orcid)0000-0003-3411-5861 aut Sæther, S. A. aut Tambets, M. aut Diserud, O. H. aut Thorstad, E. B. aut Enthalten in Animal Biotelemetry London : BioMed Central, 2013 5(2017), 1 vom: 23. März (DE-627)742220176 (DE-600)2711027-8 2050-3385 nnns volume:5 year:2017 number:1 day:23 month:03 https://dx.doi.org/10.1186/s40317-017-0122-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2017 1 23 03
spelling	10.1186/s40317-017-0122-2 doi (DE-627)SPR036925640 (SPR)s40317-017-0122-2-e DE-627 ger DE-627 rakwb eng Havn, T. B. verfasserin aut Movements of dead fish in rivers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2017 Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies. Mortality estimate (dpeaa)DE-He213 Telemetry (dpeaa)DE-He213 Radio tag (dpeaa)DE-He213 Atlantic salmon (dpeaa)DE-He213 European eel (dpeaa)DE-He213 Smolt (dpeaa)DE-He213 Silver eel (dpeaa)DE-He213 Downstream drift (dpeaa)DE-He213 Økland, F. aut Teichert, M. A. K. aut Heermann, L. (orcid)0000-0003-4620-4087 aut Borcherding, J. (orcid)0000-0003-3411-5861 aut Sæther, S. A. aut Tambets, M. aut Diserud, O. H. aut Thorstad, E. B. aut Enthalten in Animal Biotelemetry London : BioMed Central, 2013 5(2017), 1 vom: 23. März (DE-627)742220176 (DE-600)2711027-8 2050-3385 nnns volume:5 year:2017 number:1 day:23 month:03 https://dx.doi.org/10.1186/s40317-017-0122-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2017 1 23 03
allfields_unstemmed	10.1186/s40317-017-0122-2 doi (DE-627)SPR036925640 (SPR)s40317-017-0122-2-e DE-627 ger DE-627 rakwb eng Havn, T. B. verfasserin aut Movements of dead fish in rivers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2017 Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies. Mortality estimate (dpeaa)DE-He213 Telemetry (dpeaa)DE-He213 Radio tag (dpeaa)DE-He213 Atlantic salmon (dpeaa)DE-He213 European eel (dpeaa)DE-He213 Smolt (dpeaa)DE-He213 Silver eel (dpeaa)DE-He213 Downstream drift (dpeaa)DE-He213 Økland, F. aut Teichert, M. A. K. aut Heermann, L. (orcid)0000-0003-4620-4087 aut Borcherding, J. (orcid)0000-0003-3411-5861 aut Sæther, S. A. aut Tambets, M. aut Diserud, O. H. aut Thorstad, E. B. aut Enthalten in Animal Biotelemetry London : BioMed Central, 2013 5(2017), 1 vom: 23. März (DE-627)742220176 (DE-600)2711027-8 2050-3385 nnns volume:5 year:2017 number:1 day:23 month:03 https://dx.doi.org/10.1186/s40317-017-0122-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2017 1 23 03
allfieldsGer	10.1186/s40317-017-0122-2 doi (DE-627)SPR036925640 (SPR)s40317-017-0122-2-e DE-627 ger DE-627 rakwb eng Havn, T. B. verfasserin aut Movements of dead fish in rivers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2017 Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies. Mortality estimate (dpeaa)DE-He213 Telemetry (dpeaa)DE-He213 Radio tag (dpeaa)DE-He213 Atlantic salmon (dpeaa)DE-He213 European eel (dpeaa)DE-He213 Smolt (dpeaa)DE-He213 Silver eel (dpeaa)DE-He213 Downstream drift (dpeaa)DE-He213 Økland, F. aut Teichert, M. A. K. aut Heermann, L. (orcid)0000-0003-4620-4087 aut Borcherding, J. (orcid)0000-0003-3411-5861 aut Sæther, S. A. aut Tambets, M. aut Diserud, O. H. aut Thorstad, E. B. aut Enthalten in Animal Biotelemetry London : BioMed Central, 2013 5(2017), 1 vom: 23. März (DE-627)742220176 (DE-600)2711027-8 2050-3385 nnns volume:5 year:2017 number:1 day:23 month:03 https://dx.doi.org/10.1186/s40317-017-0122-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2017 1 23 03
allfieldsSound	10.1186/s40317-017-0122-2 doi (DE-627)SPR036925640 (SPR)s40317-017-0122-2-e DE-627 ger DE-627 rakwb eng Havn, T. B. verfasserin aut Movements of dead fish in rivers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2017 Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies. Mortality estimate (dpeaa)DE-He213 Telemetry (dpeaa)DE-He213 Radio tag (dpeaa)DE-He213 Atlantic salmon (dpeaa)DE-He213 European eel (dpeaa)DE-He213 Smolt (dpeaa)DE-He213 Silver eel (dpeaa)DE-He213 Downstream drift (dpeaa)DE-He213 Økland, F. aut Teichert, M. A. K. aut Heermann, L. (orcid)0000-0003-4620-4087 aut Borcherding, J. (orcid)0000-0003-3411-5861 aut Sæther, S. A. aut Tambets, M. aut Diserud, O. H. aut Thorstad, E. B. aut Enthalten in Animal Biotelemetry London : BioMed Central, 2013 5(2017), 1 vom: 23. März (DE-627)742220176 (DE-600)2711027-8 2050-3385 nnns volume:5 year:2017 number:1 day:23 month:03 https://dx.doi.org/10.1186/s40317-017-0122-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2017 1 23 03
language	English
source	Enthalten in Animal Biotelemetry 5(2017), 1 vom: 23. März volume:5 year:2017 number:1 day:23 month:03
sourceStr	Enthalten in Animal Biotelemetry 5(2017), 1 vom: 23. März volume:5 year:2017 number:1 day:23 month:03
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Mortality estimate Telemetry Radio tag Atlantic salmon European eel Smolt Silver eel Downstream drift
isfreeaccess_bool	true
container_title	Animal Biotelemetry
authorswithroles_txt_mv	Havn, T. B. @@aut@@ Økland, F. @@aut@@ Teichert, M. A. K. @@aut@@ Heermann, L. @@aut@@ Borcherding, J. @@aut@@ Sæther, S. A. @@aut@@ Tambets, M. @@aut@@ Diserud, O. H. @@aut@@ Thorstad, E. B. @@aut@@
publishDateDaySort_date	2017-03-23T00:00:00Z
hierarchy_top_id	742220176
id	SPR036925640
language_de	englisch
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author	Havn, T. B.
spellingShingle	Havn, T. B. misc Mortality estimate misc Telemetry misc Radio tag misc Atlantic salmon misc European eel misc Smolt misc Silver eel misc Downstream drift Movements of dead fish in rivers
authorStr	Havn, T. B.
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topic_title	Movements of dead fish in rivers Mortality estimate (dpeaa)DE-He213 Telemetry (dpeaa)DE-He213 Radio tag (dpeaa)DE-He213 Atlantic salmon (dpeaa)DE-He213 European eel (dpeaa)DE-He213 Smolt (dpeaa)DE-He213 Silver eel (dpeaa)DE-He213 Downstream drift (dpeaa)DE-He213
topic	misc Mortality estimate misc Telemetry misc Radio tag misc Atlantic salmon misc European eel misc Smolt misc Silver eel misc Downstream drift
topic_unstemmed	misc Mortality estimate misc Telemetry misc Radio tag misc Atlantic salmon misc European eel misc Smolt misc Silver eel misc Downstream drift
topic_browse	misc Mortality estimate misc Telemetry misc Radio tag misc Atlantic salmon misc European eel misc Smolt misc Silver eel misc Downstream drift
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title	Movements of dead fish in rivers
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title_full	Movements of dead fish in rivers
author_sort	Havn, T. B.
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author_browse	Havn, T. B. Økland, F. Teichert, M. A. K. Heermann, L. Borcherding, J. Sæther, S. A. Tambets, M. Diserud, O. H. Thorstad, E. B.
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title_sort	movements of dead fish in rivers
title_auth	Movements of dead fish in rivers
abstract	Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies. © The Author(s) 2017
abstractGer	Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies. © The Author(s) 2017
abstract_unstemmed	Background The aim of telemetry studies is often to determine the fate and mortality rates of fish. A moving fish is usually regarded as alive and a long-term stationary fish as dead—and the site where it became stationary as the site where it died. Downstream transport of dead fish in rivers can lead investigators to mistake dead fish for live fish. We examined downstream movements of 60 dead Atlantic salmon smolts and 55 dead European silver eels, equipped with radio transmitters and released at hydropower stations in three German rivers. Results Overall, dead smolts drifted up to 2.4 km downstream and dead eels up to at least 30.1 km downstream. Smolts released in an Archimedes screw turbine drifted up to 1.1 km and eels up to at least 5.1 km downstream. Most smolts stopped moving further downstream within 1 week after release, whereas the eels (or their transmitters) moved downstream over several weeks, or even months, after release. However, the distance moved varied considerably also within species and among release sites. Eighteen (30%) dead smolts and nine (16%) dead eels moved upstream or disappeared from the rivers, indicating that they had been taken by scavengers. Some of these (four smolts and one eel) had recordings, indicating that they had been taken out of the river by birds. Conclusions Fish can drift considerable distances downstream after they have died in a river. This can make it difficult to identify dead fish, and the exact site and time of death from telemetry studies. Furthermore, dead fish can be moved within the river, or taken out of the river, by scavengers. These results are relevant for studies of mortality at power stations, but also for studies of tagged fish in rivers in general. When designing telemetry studies and interpreting telemetry data, investigators should keep in mind that dead fish (or their transmitters) may drift downstream. Investigators may also consider if it is useful to release dead fish as a control groups when planning and performing fish mortality studies. © The Author(s) 2017
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container_issue	1
title_short	Movements of dead fish in rivers
url	https://dx.doi.org/10.1186/s40317-017-0122-2
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author2	Økland, F. Teichert, M. A. K. Heermann, L. Borcherding, J. Sæther, S. A. Tambets, M. Diserud, O. H. Thorstad, E. B.
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up_date	2024-07-03T20:23:48.844Z
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