Last fish @ Cape Westwind (Western Thanalan)

[AlexSylpheed]

Has anyone been able to catch the last fish here? No one I've talked to has any idea how to catch it.

The only fish you can mooch here is the Merlthor goby, and it either results in goby > wahoo > silver shark or goby > silver shark.

Is the last fish a super low chance catch after mooching the wahoo, or is it just a super rare fish that requires a certain bait/time/weather combination?

My gathering is 270 and my perception is 225, and I haven't had any luck.