Well, even before anything was announced (or rather, hinted and found out), I had two ideas about what could be fishing equipment:
1. Sonars, since they could detect the fish under water.
2. Drum canisters, because you need something to store the fish you caught. Maybe even a canister filled with fish, since you want fresh fish.
So yeah, I think it's not that far-fetched to think it could be effective, though apparently, it isn't.