Can supermarket apprentices learn to kill fish for a long time?

I can't. The work of killing fish by apprentices in supermarkets is to remove the head and tail of some fresh fish that have just landed, which can be said to be a very simple job. Fishermen are manual workers with low wages and poor working environment, so they can't work long. During the peak hours, they basically kill one after another, with little rest, and sometimes some scales are difficult to remove.