Did explosive training produce fish dinners?

How often did training with explosive shells or depth charges result in fish dinners?

Fish were served often enough in some Royal Navy periods of the 1920s and 1930s for crews to ask for a change.

The recollection concerns Royal Navy crews in the 1920s and 1930s. Fish dinners are described as frequent enough for sailors to ask that the menu change. No numerical rate is offered for how often an exercise supplied the meal.