Gathering stat for FSH

How does Gathering work for FSH?

Case A
Big Fish A requires 330 Gathering to hook: 329 or lower will result in a "gathering too low" message. Any value above 330 increases the likelihood of landing until a certain threshold is reached where landing is guaranteed.

Case B
Big Fish B requires 330 Gathering to hook: 329 or lower will result in a "gathering too low" message. Any value above 330 contributes nothing to the success of landing the fish; the fish has its own internal % landing chance.

Case C
Big Fish C requires 330 Gathering to hook: 329 or lower will result in a "gathering too low" message. A value above 330 increases the likelihood of landing once hooked, but only to a certain extent. Once the maximum bonus to landing is reached, additional Gathering contributes nothing to the success of landing the fish.

from my experience 2 star big fish have a 100% catch rate once you hit a certain gathering amount and 3 star fish have a set success rate which wont increase with additional gathering