جستجوی مقالات مرتبط با کلیدواژه « Caspian roach » در نشریات گروه « دامپزشکی »

Yersiniosis is known as one of the most prevalent bacterial diseases in fish, which causes high mortality and economic losses in cultured fish farms every year.

The present study was conducted to investigate the changes in hematological indices and gut histopathology in Caspian roach (Rutilus caspicus) exposed to Yersinia ruckeri.

60 Caspian roach broodstock with an average weight of 63.4 ± 2.1 g were divided into three groups (with two replicates for each group), including one treatment, one positive control, and one negative control groups. The treatment group was intraperitoneally injected with Yersinia ruckeri bacterium at a dosage of 3.8 × 107 cell/fish. The positive group just received normal saline (0.9 % NaCl) via intraperitoneal injection. No injection was performed in the negative control group.

Symptoms appeared on the fourth day after exposure and 20 % of the fish in the treatment group died 5 days after the challenge. Cumulative mortality reached 53 % on day 9 after the challenge.  According to hematological analysis, the challenge with Yersinia ruckeri led to a significant increase in white blood cell counts (WBC) compared to the control groups. Moreover, 10 days following exposure, the treatment group experienced hypochromic macrocytic anemia. Gut histopathology was characterized with necrosis and detachment of intestinal epithelial cell and inflammatory cells infiltration in the treatment group.

Based on the obtained results herein, Yersinia rackeri can cause acute disease in Caspian roach; therefore, preventing and controlling this disease is essential for these fish in infected regions.

This work investigates the relationship between fork length، weight، age and the uptake of heavy metals such as iron، zinc، copper and cadmium in muscle and skin tissues of fish (Rutilus rutilus caspicus) in two sites in Sari and Turkmen Seaport of Southern part of Caspian Sea. Samples were collected in autumn 2013 and winter 2014. After measurement of fork length، weight، age by squama of 37 samples and preparation and parting of tissues، concentration of heavy metals were determined following wet digestion using Flame Atomic Absorption Spectrophotometry. Spearman correlation test results showed that fork length and weight and uptake of copper in the muscle tissue have negative correlations (p<0. 05). However this correlation between the weight and the uptake of iron is positive (p<0. 05). In the skin، there is a positive correlation (p<0. 05) between fork length and extent of absorption of iron and cadmium، unlike those between the weight and the absorption of zinc. The importance of the findings of this study due to the presence of heavy metals in tissues of fishes، especially muscle tissue، which is due to the consumption of oral tissue، heavy metals have the ability to transfer to humans in terms of public health and the health of people is a special place. These values were compared with the WHO and the FAO and UK (MAFF) safety standards regarding the amount of the above mentioned heavy metals in fish tissues. Based on the results of this study، The average concentrations of cadmium in the muscle and skin tissues proved to be higher than international standards. It is recommended not to use these fish due to the toxicity and high levels of cadmium in their muscle tissues.

This study investigates the presence of heavy metals such as iron، zinc، copper and cadmium in muscle، skin، gonad and gill tissues of fish (Rutilus rutilus caspicus) in two sites in Sari and Turkmen Seaport of Southern part of Caspian Sea. Samples were collected in autumn 2013 and winter 2014. After preparation and parting of tissues، concentration of heavy metals were determined in tissues of 37 samples (20 samples in autumn and 17 samples in winter) following wet digestion using Flame Atomic Absorption Spectrophotometry. The results of this study showed that the average concentrations of iron and zinc were at maximum in gill and at minimum in muscle. However the average concentrations of copper were at maximum in gonad and at minimum in muscle and the average concentrations of cadmium were at maximum in muscle and at minimum in gonad. Iron concentrations were shown to be higher than those of zinc، copper and cadmium in various organs of fish. Accumulation of iron، zinc، copper and cadmium in muscle، skin، gonad and gill was highly significant between them (P<0. 05). Concentrations of iron in muscle and skin were significantly different (P<0. 05)، unlike those in skin and gonad (P>0. 05). Concentrations of cadmium in muscle and skin were not significantly different، unlike those in muscle and gonad. These values were compared with the WHO and the FAO and UK (MAFF) safety standards regarding the amount of the above mentioned heavy metals in fish tissues. Based on the results of this study، the average concentrations of zinc in the gill tissues proved to be higher than international standards. The average concentrations of cadmium in the muscle، skin and gill tissues proved to be higher than international standards. It is recommended not to use these fish due to the toxicity and high levels of cadmium in their muscle tissues.