First of all, the gill cover of perch is an important organ for breathing. When fishing or observing the caught bass, it is sometimes found that their gills can't be opened. In fact, this is because the gill cover of perch is a self-protection reaction. When they feel scared, frightened or uneasy, perch will automatically close their gills. Therefore, if you want to open the gill cover of perch, you need to be careful not to make the fish feel uneasy or afraid.

Secondly, if you want to open the gills of perch, you can also take some measures to help the fish relax. For example, you can put the fish into the water, then gently loosen the fish mouth and let it breathe for a period of time, so that the fish can gradually adapt to the underwater environment and reduce the occurrence of anxiety. After waiting for a period of time, the fish's gills can be easily opened, so that the fish will be more relaxed and easier to open.

In a word, we should pay attention to protect the bass when they are in a calm state, so as not to make them feel uneasy or frightened, thus reducing the fish's nervous reaction. At the same time, you can also take some relaxation methods to make the fish gradually adapt to the underwater environment, which makes it easier to open the gills.