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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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