The Yong Shen depends on the purpose of the fishing trip, as follows:
- outdoor recreation: Offspring
- selling the fish: Wealth
- competitive sport: Officer
From how you described it, it looks like the first one?
It would be the first case, recreational fishing.
It's possible. Although a lot depends on the emphasis on the question. Normally what is expected in a day of hunting or fishing is to obtain large number of hunting pieces, more than to obtain satisfaction or joy (Offspring). Satisfaction is derived from the success of the hunt, rather than from the fishing itself and a day without hunting anything or little would be frustrating. Naming frustration (alex chiu calls parents that), could then if a Parents moves devitalizing Offspring as a sign of few pieces of wild game obtained.
It is a little strange that the amount of hunting pieces is reflected under the aspect of Offspring, so I thought that the success of wild game obtained could be Official. But if we use both relative Offspring+Official there's a contradiction since one kills the other.