Incidence of streptococcusis in rainbow trout (Onchorhynchus mykiss ) farms in Haraz River in Mazandaran Province, Iran

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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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Iranian Scientific Fisheries Journal
Volume 22, Issue 4 - Serial Number 85
November and December 2014
Pages 41-50

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