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In order to determine the concentration of the antibodies against the pathogenic Vibrio anguillarum, three hundred blood samples were taken from 9-12 month old cultured rainbow trout (Oncorhynchus mykiss) in 4 farms in the north and west region of Fars Province, which had been exposed to this bacteria. An indirect ELISA was employed to examine the serum. Using soluble antigen (SA) indicated that 54% of the examined blood samples contained antibodies against Vibrio anguillarum, while by using whole cell antigen (WCB) only 53% of samples were found to be seriopositive. The highest seriopositivity rate (83%) was observed in farm #2, where clinical signs of vibriosis also occurred. This study revealed that Rainbow trouts fed on raw marine fish meal powder are more exposed to V. anguillarum. Vibriosis in cultured Rainbow trout in Iranian inland freshwater farms is also discussed in this paper......

Molecular genetic techniques were used to establish new characteristics in the animals and plants. Fishes are good animal protein resources and are suitable for genetic researches because of their short maturation time, high number of egg production in each spawning, and easy rearing. New characteristic can be establishes by it's related gene transfer. Transgenic researches in the fishes started about ten years ago. Different gene constructs were used in these researches. More than 60% of works were pure research to find the principal of gene transfers in the fishes. About 37.5% of research used growth hormone gene to improve fish growth; the rest of researches used anti-freeze protein gene. Adjustment of DNA forms, buffer contents transferring method for gene transfer are the main factors in the success of fish transgenic. There are different published researches to meet these problems in the last decade. In this paper these research is going to be reviewed and discussed......