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.
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