Evaluation of physiological aspects and molecular identification of Saprolegnia isolates from rainbow trout (Oncorhynchus mykiss) and Caspian trout (Salmo trutta caspius) eggs based on RAPD–PCR

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Abstract

The genus of saprolegnia is one of the most important pathogenic aquatic fungi in farmed and
wild fish. In the present study, fungal infected egss were collected from rainbow trout
(Oncorhyncus mykiss) and Caspian trout (Salmo trutta caspius). After purification, 16 isolates
were obtained (8 isolates from rainbow trout and 8 isolates from Caspian salmon,
respectively). The isolates were then coded as R2 – R9 (rainbow trout) and S2 – S9 (Caspian
trout).The registered DNA for S. parasitica (ACTT # 200048) and S. diclina (ACTT #
4206) were used and coded as R1 and S1, respectively. Based on the RAPD profile obtained
all samples were divided to 3 groups and members of each group had more than 90%
similarity among themselves. According to matrix of similarity and reference strains, the
isolates were classified as three groups. Therefore, all of isolates in group 1 and 3 were S.
parasitica and S. diclina, respectively, and the members of group 2 were known as
Saprolegnia sp. The results of thermal resistance assessment showed that the isolates of
rainbow trout and Caspian salmon eggs had slow growth in the temperature between 18 – 20
°C. Thus, R2 and S8 isolates had the lowest radial growth compared to other isolates. The
isolates categorized in S. parasitica (group 1) created secoundry zoospores but not observed
in two other groups. Thus, catenulated gamme was found in 78% and 55.55% isolates of
rainbow trout and Caspian trout eggs, respectively.
This study indicated that molecular methods were the best methods for identification of
Saprolegnia spp. and it could be applied as a supplementary confirming method.

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Iranian Scientific Fisheries Journal
Volume 22, Issue 4 - Serial Number 85
November and December 2014
Pages 82-92

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