TY  - JOUR
AU  - Smederevac-Lalić, Marija
AU  - Kalauzi, Aleksandar
AU  - Regner, Slobodan
AU  - Navodaru, Ion
AU  - Višnjić-Jeftić, Željka
AU  - Gačić, Zoran
AU  - Lenhardt, Mirjana
PY  - 2018
UR  - http://jifro.ir/browse.php?a_id=3486&sid=1&slc_lang=en
UR  - https://radar.ibiss.bg.ac.rs/handle/123456789/3096
AB  - The relationship between the Lower Danube River level and Romanian annual catches of Pontic shad (Alosa immaculata, Bennett 1835) were analyzed. For analysis of long term data on the Danube River water level and Pontic shad catch, combinations of different methods were applied using statistical programs, SPSS 13.0 and MATLAB 6. Periodograms, containing cyclic patterns, were obtained using Fourier analysis. Significant oscillations were determined with Fisher-Whittle’s tests and residuals were calculated after subtracting these significant oscillations from the original signals. Autoregressive moving average (ARMA) models of residuals were finally applied. Results indicated that river water levels, and especially those in May, greatly explained the fluctuations of Pontic shad catch. Annual landings varied greatly and appeared to be cyclic. Varying river flow was considered to be one of the most important factors that cause fluctuations in the size of populations. Forecast indicates gradual increase of the catch in the next decade, followed by a decrease in other decades. Estimated as a vulnerable species of fish by the IUCN, development of the forecasting model of the future catch oscillations could be very helpful to regulate fishing efforts towards the sustainable use of stocks and species conservation.
T2  - Iranian Journal of Fisheries Sciences
T1  - Analysis and forecast of Pontic shad (Alosa immaculata) catch in the Danube River
IS  - 3
VL  - 17
DO  - 10.22092/IJFS.2018.116611
SP  - 443
EP  - 457
ER  - 

@article{
author = "Smederevac-Lalić, Marija and Kalauzi, Aleksandar and Regner, Slobodan and Navodaru, Ion and Višnjić-Jeftić, Željka and Gačić, Zoran and Lenhardt, Mirjana",
year = "2018",
abstract = "The relationship between the Lower Danube River level and Romanian annual catches of Pontic shad (Alosa immaculata, Bennett 1835) were analyzed. For analysis of long term data on the Danube River water level and Pontic shad catch, combinations of different methods were applied using statistical programs, SPSS 13.0 and MATLAB 6. Periodograms, containing cyclic patterns, were obtained using Fourier analysis. Significant oscillations were determined with Fisher-Whittle’s tests and residuals were calculated after subtracting these significant oscillations from the original signals. Autoregressive moving average (ARMA) models of residuals were finally applied. Results indicated that river water levels, and especially those in May, greatly explained the fluctuations of Pontic shad catch. Annual landings varied greatly and appeared to be cyclic. Varying river flow was considered to be one of the most important factors that cause fluctuations in the size of populations. Forecast indicates gradual increase of the catch in the next decade, followed by a decrease in other decades. Estimated as a vulnerable species of fish by the IUCN, development of the forecasting model of the future catch oscillations could be very helpful to regulate fishing efforts towards the sustainable use of stocks and species conservation.",
journal = "Iranian Journal of Fisheries Sciences",
title = "Analysis and forecast of Pontic shad (Alosa immaculata) catch in the Danube River",
number = "3",
volume = "17",
doi = "10.22092/IJFS.2018.116611",
pages = "443-457"
}

Smederevac-Lalić, M., Kalauzi, A., Regner, S., Navodaru, I., Višnjić-Jeftić, Ž., Gačić, Z.,& Lenhardt, M.. (2018). Analysis and forecast of Pontic shad (Alosa immaculata) catch in the Danube River. in Iranian Journal of Fisheries Sciences, 17(3), 443-457.
https://doi.org/10.22092/IJFS.2018.116611

Smederevac-Lalić M, Kalauzi A, Regner S, Navodaru I, Višnjić-Jeftić Ž, Gačić Z, Lenhardt M. Analysis and forecast of Pontic shad (Alosa immaculata) catch in the Danube River. in Iranian Journal of Fisheries Sciences. 2018;17(3):443-457.
doi:10.22092/IJFS.2018.116611 .

Smederevac-Lalić, Marija, Kalauzi, Aleksandar, Regner, Slobodan, Navodaru, Ion, Višnjić-Jeftić, Željka, Gačić, Zoran, Lenhardt, Mirjana, "Analysis and forecast of Pontic shad (Alosa immaculata) catch in the Danube River" in Iranian Journal of Fisheries Sciences, 17, no. 3 (2018):443-457,
https://doi.org/10.22092/IJFS.2018.116611 . .

TY  - JOUR
AU  - Višnjić-Jeftić, Željka
AU  - Lenhardt, Mirjana
AU  - Navodaru, I.
AU  - Hegediš, A.
AU  - Gačić, Z.
AU  - Nikčević, M.
PY  - 2009
PY  - 2009
UR  - https://radar.ibiss.bg.ac.rs/handle/123456789/228
AB  - Specimens of Pontic shad (Alosa pontica Eichwald, 1838) were collected during April and May of 2006 in the Danube River (rkm 863) just downstream of the Iron Gate (Djerdap) II dam. Twenty-eight scales and 30 vertebrae were prepared and given to five interpreters with fish aging experience of from 3 to 30 years and with shad aging experience of from 0 to 12 years. Interpreters with experience in shad age determination showed lower values for the index of average percent error (IAPE) and an index of coefficient of variation (ICV). In regard to within-interpreter reproducibility, no significant differences were found between scale and vertebrae as structure for age determination. The most experienced reader showed the lowest value for IAPE, while the least experienced reader showed the highest value for IAPE. The results of this work indicate that experience in age determination by particular structure had more impact on age determination precision than specificity of structure, scale or vertebra. More work is needed on adopting standard protocols that must include some sort of common interaction between responsible age readers.
AB  - U ovoj studiji analizirana je primenljivost starosne determinacije pomoću krljušti i pršljenova kod Alosa pontica Eichwald, 1838 iz Dunava. Neophodno je više studija o sačinjavanju standardnih protokola koji bi bili evaluirani od strane kompetentnih stručnjaka.
T2  - Archives of Biological Sciences
T1  - Reproducibilnost starosne determinacije pomoću krljušti i pršljenova kod Alosa pontica Eichwald, 1838 iz Dunava
T1  - Reproducibility of age determination by scale and vertebra in pontic shad (Alosa pontica Eichwald, 1838), from the Danube
IS  - 2
VL  - 61
SP  - 337
EP  - 341
UR  - https://hdl.handle.net/21.15107/rcub_ibiss_228
ER  - 

@article{
author = "Višnjić-Jeftić, Željka and Lenhardt, Mirjana and Navodaru, I. and Hegediš, A. and Gačić, Z. and Nikčević, M.",
year = "2009, 2009",
abstract = "Specimens of Pontic shad (Alosa pontica Eichwald, 1838) were collected during April and May of 2006 in the Danube River (rkm 863) just downstream of the Iron Gate (Djerdap) II dam. Twenty-eight scales and 30 vertebrae were prepared and given to five interpreters with fish aging experience of from 3 to 30 years and with shad aging experience of from 0 to 12 years. Interpreters with experience in shad age determination showed lower values for the index of average percent error (IAPE) and an index of coefficient of variation (ICV). In regard to within-interpreter reproducibility, no significant differences were found between scale and vertebrae as structure for age determination. The most experienced reader showed the lowest value for IAPE, while the least experienced reader showed the highest value for IAPE. The results of this work indicate that experience in age determination by particular structure had more impact on age determination precision than specificity of structure, scale or vertebra. More work is needed on adopting standard protocols that must include some sort of common interaction between responsible age readers., U ovoj studiji analizirana je primenljivost starosne determinacije pomoću krljušti i pršljenova kod Alosa pontica Eichwald, 1838 iz Dunava. Neophodno je više studija o sačinjavanju standardnih protokola koji bi bili evaluirani od strane kompetentnih stručnjaka.",
journal = "Archives of Biological Sciences",
title = "Reproducibilnost starosne determinacije pomoću krljušti i pršljenova kod Alosa pontica Eichwald, 1838 iz Dunava, Reproducibility of age determination by scale and vertebra in pontic shad (Alosa pontica Eichwald, 1838), from the Danube",
number = "2",
volume = "61",
pages = "337-341",
url = "https://hdl.handle.net/21.15107/rcub_ibiss_228"
}

Višnjić-Jeftić, Ž., Lenhardt, M., Navodaru, I., Hegediš, A., Gačić, Z.,& Nikčević, M.. (2009). Reproducibilnost starosne determinacije pomoću krljušti i pršljenova kod Alosa pontica Eichwald, 1838 iz Dunava. in Archives of Biological Sciences, 61(2), 337-341.
https://hdl.handle.net/21.15107/rcub_ibiss_228

Višnjić-Jeftić Ž, Lenhardt M, Navodaru I, Hegediš A, Gačić Z, Nikčević M. Reproducibilnost starosne determinacije pomoću krljušti i pršljenova kod Alosa pontica Eichwald, 1838 iz Dunava. in Archives of Biological Sciences. 2009;61(2):337-341.
https://hdl.handle.net/21.15107/rcub_ibiss_228 .

Višnjić-Jeftić, Željka, Lenhardt, Mirjana, Navodaru, I., Hegediš, A., Gačić, Z., Nikčević, M., "Reproducibilnost starosne determinacije pomoću krljušti i pršljenova kod Alosa pontica Eichwald, 1838 iz Dunava" in Archives of Biological Sciences, 61, no. 2 (2009):337-341,
https://hdl.handle.net/21.15107/rcub_ibiss_228 .