Iranian Journal of Fisheries Sciences
مجله علوم شیلاتی ایران
IJFS
Agriculture
http://jifro.ir
1
admin
1562-2916
10.18869/acadpub.ijfs
en
jalali
1398
12
1
gregorian
2020
3
1
19
2
online
1
fulltext
en
Population growth of Brachionus calyciflorus affected by deltamethrin and imidacloprid insecticides
Toxicology
Toxicology
پژوهشي
Orginal research papers
Rotifers due to their relatively short lifespan, high fecundity and high rate of population growth are ideal for chronic toxicity tests. The aim of this research was to determine the lethal concentrations (LC<sub>50</sub> 24 h) of deltamethrin and imidaclopride and their impacts on the reproduction and growth of the freshwater rotifer, <em>Brachionus calyciflorus</em>. Experiments were carried out based on the guidelines of the standard methods of OECD. Based on LC<sub>50</sub> levels of pesticides, different concentration treatment groups designated and rotifer population responses in the five different concentrations of deltamethrin (0.00, 0.05, 0.10, 0.21 and 0.53 mg L<sup>-1</sup>) and imidacloprid (0.00, 6.22, 12.45, 24.91 and 62.27 mg L<sup>-1</sup>) were studied during ten days. The LC<sub>50</sub> 24h of deltamethrin and imidacloprid for freshwater rotifer determined as 1.06 mg L<sup>-1</sup> and 124.54 mg L<sup>-1</sup>, respectively. The density of rotifers in all treatment groups of pesticides decreased significantly compared to the control group at tenth day (<em>p</em><0.05). The ratio of ovigerous females to nonovigerous females (OF/NOF) and the ratio of mictic females to amictic females (mic/amic) were significantly affected (<em>p</em><0.05) in all concentrations of both insecticides. The results of this study suggested that <em>B. calyciflorus</em> are severely sensitive to deltamethrin rather than to imidacloprid pesticide.
Brachionus calyciflorus, Pesticide toxicity, Population growth, Lethal concentration.
588
601
http://jifro.ir/browse.php?a_code=A-10-1217-4&slc_lang=en&sid=1
A.
Gharaei
agharaei551@gmail.com
100319475328460033871
100319475328460033871
Yes
Department of Fisheries, Faculty of Natural Resources and Hamoon International Wetland Research Institute, University of Zabol, Zabol, Iran
M.
Karimi
agharaei551@yahoo.com
100319475328460033872
100319475328460033872
No
Department of Fisheries, Natural Resources Faculty, University of Zabol, Zabol, Iran
J.
Mirdar Harijani
javadmirdar@gmail.com
100319475328460033873
100319475328460033873
No
Department of Fisheries, Faculty of Natural Resources, University of Zabol, Iran
M.
Miri
mirimohadeseh@uoz.ac.ir
100319475328460033874
100319475328460033874
No
Hamoon International Wetland Research Institute, University of Zabol, Zabol, Iran.
C.
Faggio
cfaggio@unime.it
100319475328460033875
100319475328460033875
No
Department of Chemical, Biological, Pharmaceutical, and Environmental Sciences, University of Messina, Viale F. Stagno d’Alcontres, 31, 98166 Messina, Italy