Just use a relatively strong plastic bag.

Look at the fish shape. High-quality silver carp has a uniform body shape, intact scales, no damage to the body, flat sides, a large and narrow abdominal cavity, a big head and small eyes, a forked tail fin, small, silvery white scales, and no deformity. Heavily polluted fish have abnormal shapes, bloated maws, and severe deformities.

High-quality silver carp has transparent mucus on its surface, and its scales are shiny and adhere closely to the fish body, making them difficult to fall off. The mucus on the surface of inferior silver carp is often opaque, and the scales have poor gloss and are easy to fall off.