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Showing 3 results for Streptococcusis

R. Pourgholam , M. Sharif Rohani, R. Safari , A.a. Saeeidi , M. Binaeei , R. Najafeyan , Z. Bankehsaz, M.j. Taghavi , A. Sepahdari ,
Volume 22, Issue 3 (10-2013)
Abstract

In this study, some non-specific immune responses and hematological parameters in rainbow trout juveniles (16g mean weight) and their resistance to Streptococcusis were invetigated following dietary administration of 3 concentrations (0.5, 1, 1.5g/kg of feed) of Echinacea purpurea extract. The non-pecific immune response and hematological parameter compared with control group for 60 days. Evaluated parameters included were of C3, C4, (complement components), superoxide ions (respiratory burst), lysozyme activity, number of WBC, percentage of blood lymphocytes, monocytes and neutrophils. At the end of trial, the relative survival rate (RSR) of fish was evaluated against S. iniae. The results showed that the levels of C3, lysozyme activity, superoxide ions, number of WBC and percentage of neutrophils in the experiment groups (the highest concentration, 1.5g/kg of feed) were increased significantly compared to the control group. Whereas, no significant difference was found in the value of C4 and the percentage of monocytes and lymphocytes in comparison to the control group. The relative survival rates of fish following challenge with Streptococcus iniae, were 91.11 and 44.44 percent in experiment (Echinacea purpurea, concentration of 1.5g/kg of feed) and control group, respectively. In conclusion, the results of the present study demonstrated that Echinacea purpurea. extract enhanced the non-specific immune system and fish resistance against streptococcusis, suggesting that this extract might be used as immunostimulant in fish feed.
A. Sepahdari , A. Saeedi , Sh. Kakoulaki , F. Habibi Kotanaee , A.r. Babaalian ,
Volume 22, Issue 3 (10-2013)
Abstract

Streptococcusis is the one of the most important bacterial fish diseases with outbreak in rainbow trout farms in Iran. The fish farmers have been largely suffered from huge economic losses due to the Streptococcusis outbreaks in different rainbow trout farms in Iran. The present study assessed the effects of some environmental risk factors on incidence of streptococcusis in rainbow trout farms in Haraz River in Mazandaran Province, Iran. A suit of environmental factors including water temperature, nitrite, nitrate, ammonium, water turbidity, DO, water Debi and total count of bacteria were explored as influential factors. Fish and water samples were randomly collected from 10 farm on a monthly basis throughout a year. Isolation and recognition of strep strains were made using biochemical and PCR tests and the data were analyzed by logistic regression method. According to the results, 20% of the differences were explained by the logistic model. Management of these factors might decline the rate of disease outbreak.
A. Sepahdari, A. S. Saeedi, S. Kakoulaki, F. Habibi Kotanaee, A. R. Babaalian,
Volume 22, Issue 4 (1-2014)
Abstract

One of the most important bacterial fish diseases which have caused some outbreaks in rainbow trout farms in Iran is streptococcusis .The farmers have been suffering from huge economical losses due to the disease outbreak in different rainbow trout farms in Iran. The aim of present study was to determine the rate of streptococcusis incidence in different growth stage in the farmed rainbow trout in Haraz River in Mazandaran Province, Iran. Fish specimens along with water samples were collected from 10 haphazardly selected fish farms on a monthly basis throughout a year. After clinical observations, isolation and recognition of strep strains were undertaken using biochemical and PCR tests. The results showed that 4.6% of juvenile fish showed clinical sings of streptococcusis while only 0.7% had strep. contamination. These rates in adult specimens were 8.9 and 1 percent, respectively. The main isolated bacterial strain was Streptococcus uberis

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با کسب مجوز از دفتر کمیسیون بررسی نشریات علمی وزارت علوم، تحقیات و فنآوری مجله علمی شیلات بصورت آنلاین می باشد و تعداد محدودی هم به چاپ می رساند. شماره شاپای جدید آن ISSN:2322-5998 است

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