Prepare feeder cells and take kidney tissue of tilapia. The technological process of fish cell engineering is to prepare feeder cells and take the kidney tissue of tilapia. After cold digestion, the primary monolayer cells were inoculated at the rate of 6.5438 0 million cells /ml, which was used for feeding cells. Animal cell engineering Animal cell engineering is to apply the theories and methods of cell biology and molecular biology, and carry out genetic operations at the cell level according to human design, so as to obtain new organisms.