TY  - CONF
AU  - Spasić, Slađana
AU  - Smederevac-Lalić, Marija
AU  - Lenhardt, Mirjana
AU  - Hont, Stefan
AU  - Paraschiv, Marian
AU  - Iani, I. Marian
AU  - Nichersu, Iulian
AU  - Trifanov, Cristian
AU  - Nikčević, Miroslav
AU  - Klimley, Abbott Peter
AU  - Suciu, Radu
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2829
AB  - In this study, the movements and behaviour of Wels catfish (Silurus glanis, Linnaeus, 1758) were
monitored during the different seasons when the water level in the river changed significantly. Wels
catfish was caught on the Danube River, rkm 863, and tagged with an ultrasonic transmitter.
Deployed Vemco receivers recorded detections of spatial movement between years 2015 and 2017.
Our telemetry data found relatively short movements within a maximum range (~12km), but as a
territorial species most of the time it was recorded by the two receivers, close to the Iron Gate dam
and location where it was caught. Circadian rhythm showed that in the summer period, nocturnal
activity is evident while during winter Wels catfish stayed most of the time at the same depth under
the water surface. Wels catfish changed depths during the autumn and spring when more activity
was recorded. The last signal received was during the winter 2017, which was period with the low
temperatures and ice cover on the Danube River. This research shows the value and importance of
installing coded acoustic transmitters in fish and monitoring their movement using a series of
autonomous receivers deployed in the Danube River. Research by telemetry can be used to better
understand fish behaviour and movements and to help improve large river management measures.
PB  - University in Banjaluka, Faculty of Technology
C3  - XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska
T1  - Circadian activity of the Wels catfish (Silurus glanis) in the Danube River
SP  - 158
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2829
ER  - 

@conference{
author = "Spasić, Slađana and Smederevac-Lalić, Marija and Lenhardt, Mirjana and Hont, Stefan and Paraschiv, Marian and Iani, I. Marian and Nichersu, Iulian and Trifanov, Cristian and Nikčević, Miroslav and Klimley, Abbott Peter and Suciu, Radu",
year = "2022",
abstract = "In this study, the movements and behaviour of Wels catfish (Silurus glanis, Linnaeus, 1758) were
monitored during the different seasons when the water level in the river changed significantly. Wels
catfish was caught on the Danube River, rkm 863, and tagged with an ultrasonic transmitter.
Deployed Vemco receivers recorded detections of spatial movement between years 2015 and 2017.
Our telemetry data found relatively short movements within a maximum range (~12km), but as a
territorial species most of the time it was recorded by the two receivers, close to the Iron Gate dam
and location where it was caught. Circadian rhythm showed that in the summer period, nocturnal
activity is evident while during winter Wels catfish stayed most of the time at the same depth under
the water surface. Wels catfish changed depths during the autumn and spring when more activity
was recorded. The last signal received was during the winter 2017, which was period with the low
temperatures and ice cover on the Danube River. This research shows the value and importance of
installing coded acoustic transmitters in fish and monitoring their movement using a series of
autonomous receivers deployed in the Danube River. Research by telemetry can be used to better
understand fish behaviour and movements and to help improve large river management measures.",
publisher = "University in Banjaluka, Faculty of Technology",
journal = "XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska",
title = "Circadian activity of the Wels catfish (Silurus glanis) in the Danube River",
pages = "158",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2829"
}

Spasić, S., Smederevac-Lalić, M., Lenhardt, M., Hont, S., Paraschiv, M., Iani, I. M., Nichersu, I., Trifanov, C., Nikčević, M., Klimley, A. P.,& Suciu, R.. (2022). Circadian activity of the Wels catfish (Silurus glanis) in the Danube River. in XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska
University in Banjaluka, Faculty of Technology., 158.
https://hdl.handle.net/21.15107/rcub_rimsi_2829

Spasić S, Smederevac-Lalić M, Lenhardt M, Hont S, Paraschiv M, Iani IM, Nichersu I, Trifanov C, Nikčević M, Klimley AP, Suciu R. Circadian activity of the Wels catfish (Silurus glanis) in the Danube River. in XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska. 2022;:158.
https://hdl.handle.net/21.15107/rcub_rimsi_2829 .

Spasić, Slađana, Smederevac-Lalić, Marija, Lenhardt, Mirjana, Hont, Stefan, Paraschiv, Marian, Iani, I. Marian, Nichersu, Iulian, Trifanov, Cristian, Nikčević, Miroslav, Klimley, Abbott Peter, Suciu, Radu, "Circadian activity of the Wels catfish (Silurus glanis) in the Danube River" in XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska (2022):158,
https://hdl.handle.net/21.15107/rcub_rimsi_2829 .

TY  - JOUR
AU  - Lenhardt, Mirjana
AU  - Smederevac-Lalić, Marija
AU  - Spasić, Slađana
AU  - Hont, Stefan
AU  - Paraschiv, Marian
AU  - Iani, Marian I.
AU  - Nikčević, Miroslav
AU  - Klimley, Peter A.
AU  - Suciu, Radu
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1455
AB  - The giant European catfish, Silurus glanis (total length = 200 cm; total weight approximate to 80 kg) was caught downstream of Iron Gate II hydropower dam (Danube River, 863 rkm) and tagged with an ultrasonic transmitter (V16TP; Vemco Ltd.) equipped with depth and temperature sensors. Changes in catfish diving behavior and temperature exposure were monitored over a period of roughly 2 years. Transmitter detections were recorded by nine autonomous receivers (VR2W, installed in 2015 between Serbia and Romania, as well as near Romanian shiplock and upstream Romanian turbines). The first signals were recorded on April 28, 2015 and the last on February 13, 2017. Altogether 59,355 and 59,175 detections of the catfish depth and water temperature were recorded, respectively. The greatest number of signals were recorded by the two receivers closest to the location where the catfish was caught, 72.3% and 27.1%, while only 0.6% of signals were recorded by other receivers. The mean catfish depth was 8.4 m, while minimum and maximum depths were 1.2 and 16.2 m. Results obtained showed that this catfish exhibited high site fidelity, while changes in depth at certain periods are possibly related to its search for prey and upstream migration during the spawning period. Hydropower dam and shiplock were obstacles on its migration upstream and telemetry studies could ensure habitat requirements and meet the development of restoration and conservation strategies for the fish resources in the future.
PB  - Wiley, Hoboken
T2  - International Review of Hydrobiology
T1  - Seasonal changes in depth position and temperature of European catfish (Silurus glanis) tracked by acoustic telemetry in the Danube River
EP  - 201
IS  - 3-4
SP  - 191
VL  - 106
DO  - 10.1002/iroh.202002049
ER  - 

@article{
author = "Lenhardt, Mirjana and Smederevac-Lalić, Marija and Spasić, Slađana and Hont, Stefan and Paraschiv, Marian and Iani, Marian I. and Nikčević, Miroslav and Klimley, Peter A. and Suciu, Radu",
year = "2021",
abstract = "The giant European catfish, Silurus glanis (total length = 200 cm; total weight approximate to 80 kg) was caught downstream of Iron Gate II hydropower dam (Danube River, 863 rkm) and tagged with an ultrasonic transmitter (V16TP; Vemco Ltd.) equipped with depth and temperature sensors. Changes in catfish diving behavior and temperature exposure were monitored over a period of roughly 2 years. Transmitter detections were recorded by nine autonomous receivers (VR2W, installed in 2015 between Serbia and Romania, as well as near Romanian shiplock and upstream Romanian turbines). The first signals were recorded on April 28, 2015 and the last on February 13, 2017. Altogether 59,355 and 59,175 detections of the catfish depth and water temperature were recorded, respectively. The greatest number of signals were recorded by the two receivers closest to the location where the catfish was caught, 72.3% and 27.1%, while only 0.6% of signals were recorded by other receivers. The mean catfish depth was 8.4 m, while minimum and maximum depths were 1.2 and 16.2 m. Results obtained showed that this catfish exhibited high site fidelity, while changes in depth at certain periods are possibly related to its search for prey and upstream migration during the spawning period. Hydropower dam and shiplock were obstacles on its migration upstream and telemetry studies could ensure habitat requirements and meet the development of restoration and conservation strategies for the fish resources in the future.",
publisher = "Wiley, Hoboken",
journal = "International Review of Hydrobiology",
title = "Seasonal changes in depth position and temperature of European catfish (Silurus glanis) tracked by acoustic telemetry in the Danube River",
pages = "201-191",
number = "3-4",
volume = "106",
doi = "10.1002/iroh.202002049"
}

Lenhardt, M., Smederevac-Lalić, M., Spasić, S., Hont, S., Paraschiv, M., Iani, M. I., Nikčević, M., Klimley, P. A.,& Suciu, R.. (2021). Seasonal changes in depth position and temperature of European catfish (Silurus glanis) tracked by acoustic telemetry in the Danube River. in International Review of Hydrobiology
Wiley, Hoboken., 106(3-4), 191-201.
https://doi.org/10.1002/iroh.202002049

Lenhardt M, Smederevac-Lalić M, Spasić S, Hont S, Paraschiv M, Iani MI, Nikčević M, Klimley PA, Suciu R. Seasonal changes in depth position and temperature of European catfish (Silurus glanis) tracked by acoustic telemetry in the Danube River. in International Review of Hydrobiology. 2021;106(3-4):191-201.
doi:10.1002/iroh.202002049 .

Lenhardt, Mirjana, Smederevac-Lalić, Marija, Spasić, Slađana, Hont, Stefan, Paraschiv, Marian, Iani, Marian I., Nikčević, Miroslav, Klimley, Peter A., Suciu, Radu, "Seasonal changes in depth position and temperature of European catfish (Silurus glanis) tracked by acoustic telemetry in the Danube River" in International Review of Hydrobiology, 106, no. 3-4 (2021):191-201,
https://doi.org/10.1002/iroh.202002049 . .

TY  - JOUR
AU  - Jarić, Ivan
AU  - Lenhardt, Mirjana
AU  - Pallon, Jan
AU  - Elfman, Mikael
AU  - Kalauzi, Aleksandar
AU  - Suciu, Radu
AU  - Cvijanović, Gorčin
AU  - Ebenhard, Torbjorn
PY  - 2011
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/451
AB  - Sturgeon populations in the Danube River have experienced severe decline during the last several decades, mostly due to the poorly regulated fishery, river fragmentation and water pollution. This study focuses on gaining better understanding of sturgeon life history primarily by addressing the assessment of microelement accumulation in sturgeon pectoral fin rays, especially of strontium and calcium, as a method that can reveal migration patterns of anadromous sturgeons. Analysis was performed on pectoral fin samples of three anadromous Danube sturgeon species (beluga, Russian sturgeon and stellate sturgeon) by the use of a Nuclear Microprobe technique. The most frequent pattern in analyzed samples was represented by a low Sr:Ca ratio in the innermost annuli, followed by an increased ratio in the middle annuli segment, and often with a decreased ratio in the outermost annuli. Probability density estimate has revealed three distinguished maxima of the Sr: Ca ratio, 7.08x10(-3), 8.98x10(-3) and 9.90x10(-3), which might correspond, respectively, to fresh, brackish and saltwater. Although the analysis of the Sr: Ca ratio in sturgeon pectoral fin rays has revealed changes that might indicate probable migration between habitats with different water salinity, further studies are needed for improvement of this method. This study represents the first analysis of this kind that was conducted on sturgeon species from the Black Sea basin.
PB  - Springer, New York
T2  - Environmental Biology of Fishes
T1  - Insight into Danube sturgeon life history: trace element assessment in pectoral fin rays
EP  - 181
IS  - 2
SP  - 171
VL  - 90
DO  - 10.1007/s10641-010-9728-4
ER  - 

@article{
author = "Jarić, Ivan and Lenhardt, Mirjana and Pallon, Jan and Elfman, Mikael and Kalauzi, Aleksandar and Suciu, Radu and Cvijanović, Gorčin and Ebenhard, Torbjorn",
year = "2011",
abstract = "Sturgeon populations in the Danube River have experienced severe decline during the last several decades, mostly due to the poorly regulated fishery, river fragmentation and water pollution. This study focuses on gaining better understanding of sturgeon life history primarily by addressing the assessment of microelement accumulation in sturgeon pectoral fin rays, especially of strontium and calcium, as a method that can reveal migration patterns of anadromous sturgeons. Analysis was performed on pectoral fin samples of three anadromous Danube sturgeon species (beluga, Russian sturgeon and stellate sturgeon) by the use of a Nuclear Microprobe technique. The most frequent pattern in analyzed samples was represented by a low Sr:Ca ratio in the innermost annuli, followed by an increased ratio in the middle annuli segment, and often with a decreased ratio in the outermost annuli. Probability density estimate has revealed three distinguished maxima of the Sr: Ca ratio, 7.08x10(-3), 8.98x10(-3) and 9.90x10(-3), which might correspond, respectively, to fresh, brackish and saltwater. Although the analysis of the Sr: Ca ratio in sturgeon pectoral fin rays has revealed changes that might indicate probable migration between habitats with different water salinity, further studies are needed for improvement of this method. This study represents the first analysis of this kind that was conducted on sturgeon species from the Black Sea basin.",
publisher = "Springer, New York",
journal = "Environmental Biology of Fishes",
title = "Insight into Danube sturgeon life history: trace element assessment in pectoral fin rays",
pages = "181-171",
number = "2",
volume = "90",
doi = "10.1007/s10641-010-9728-4"
}

Jarić, I., Lenhardt, M., Pallon, J., Elfman, M., Kalauzi, A., Suciu, R., Cvijanović, G.,& Ebenhard, T.. (2011). Insight into Danube sturgeon life history: trace element assessment in pectoral fin rays. in Environmental Biology of Fishes
Springer, New York., 90(2), 171-181.
https://doi.org/10.1007/s10641-010-9728-4

Jarić I, Lenhardt M, Pallon J, Elfman M, Kalauzi A, Suciu R, Cvijanović G, Ebenhard T. Insight into Danube sturgeon life history: trace element assessment in pectoral fin rays. in Environmental Biology of Fishes. 2011;90(2):171-181.
doi:10.1007/s10641-010-9728-4 .

Jarić, Ivan, Lenhardt, Mirjana, Pallon, Jan, Elfman, Mikael, Kalauzi, Aleksandar, Suciu, Radu, Cvijanović, Gorčin, Ebenhard, Torbjorn, "Insight into Danube sturgeon life history: trace element assessment in pectoral fin rays" in Environmental Biology of Fishes, 90, no. 2 (2011):171-181,
https://doi.org/10.1007/s10641-010-9728-4 . .