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Showing 3 results for Sturgeons
Ashkan Banan, Mohammad Reza Kalbassi Masjed Shahi, Mahmoud Bahmani, Mohammad Ali Yazdani Sadati,
Volume 5, Issue 1 (6-2016)
Abstract
Silver nanoparticles (AgNPs) are widely used in consumer products mainly due to their antimicrobial action. The rapid increase in the use of nanoparticles has driven more attention to their possible ecotoxicological effects. In this study: first, acute effects of colloidal AgNPs during embryonic stage of Persian sturgeon and Starry sturgeon were investigated and then in Starry sturgeon, their short-term effects during early life stages (before active feeding commences) were analyzed. Based on the obtained results from the acute toxicity tests, AgNPs induced a dose-dependent toxicity in both species during early life stages. The short-term toxicity test was performed using 0, 0.025, 0.05 and 0.1 mg/l of colloidal AgNPs. Silver accumulation in larvae exposed to 0.1 mg/l AgNPs was recorded significantly higher than the control treatment (P<0.05). However, the obtained survival rate data did not indicate any significant differences among treatments.
Amirhossein Smiley, Nazila Yeganeh,
Volume 11, Issue 3 (8-2022)
Abstract
This study was carried out after receiving a report of the mortality of Sterlet sturgeon (Acipenser ruthenus) juveniles from a fish farm in Sari-Mazandaran in April 2021 to isolate and identify the pathogen in the ill Sterlet sturgeon (A. ruthenus) juveniles. Sampling was performed from 20 ill Sterlet (A. ruthenus) juveniles. Clinical symptoms were recorded, followed by autopsy, kidney, and liver tissue sampling, bacterial culture, biochemical tests, anti-biogram test, DNA isolation, and 16Sr RNA gene sequencing. The tested isolate with 1418 base pairs (bp) was identified as a non-motile strain of A. veronii bacteria. It was registered in the World Gene Bank (NCBI) under the name Aeromonas veronii TMU000126. This strain of bacterium showed sensitivity to the Florfenicol as well as, resistance to Trimethoprim-sulfamethoxazole, Oxytetracycline, Doxycycline, and Fosfomycin antibiotics. The results revealed that the non-motile strain of A. veronii, like its motile strain, was the cause of disease and mortality in Sterlet sturgeon (A. ruthenus). According to the available studies, this study might be considered the first study on the disease of the sturgeon species of Sterlet (A. ruthenus), and the pathogenicity of the non-motile strain of A. veronii species.
Faezeh Mortezaei, Bahram Falahatkar, Mir Masoud Sajjadi, Roghieh Safari,
Volume 12, Issue 4 (12-2023)
Abstract
The objective of this study was to evaluate the performance of nutritional programming on growth and hematological indices of sterlet sturgeon (Acipenser ruthenus) during the larval stage by partial replacement of fish meal (FM) with soybean meal (S). Sterlet sturgeon with initial mean weight of 0.32 ± 0.01 g were randomly distributed into twelve circular concrete tanks (260 fish per each tank) and fed four experimental diets with substitution levels of 0 (control/FM), 15% (S15), 30% (S30) and 45% (S45) of fish meal with soybean meal during three phases in three replicates. In phase 1 (programming), fish were fed four different diets for 28 days. All the groups were then fed with FM during phases 2 (intermediate) and S45 at phase 3 (challenge) for 28 days. At the end of each phase, growth indices were measured. Hematological indices including red blood cell, hemoglobin, hematocrit, mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration were assessed at the end of the challenge phase. The growth performance was not significantly different in either phases 1 or 2 (P > 0.05); however, final weight, weight gain, specific growth rate, and average daily growth were significantly higher in S45 than FM during phase 3 (P < 0.05). Moreover, no significant difference was indicated among the groups in hematological indices (P > 0.05). According to the obtained results, early nutritional programming could effectively enhance the adaptation of sterlet sturgeon to plant-based protein later in life.
