some of them are *** though. Shonisaurus for example...
It needs to be clear weather that is followed immediately by a blizzard.
You then need to catch a Cloud Cutter, but it needs to be HQ because you need it to mooch...
a Mahar, which is the big green border fish that requires the Clear -> Blizzard double weather. But it needs to be HQ, which requires 380 Gathering and 320 perception at the same time, because...
you then use the HQ Mahar to mooch Shonisaurus, which is a living legend so it takes loads of luck just to reel the *** in, like a 3/5 chance of the line snapping.
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That site is
http://ffxivfisher.appspot.com/
I use Angler mostly, but people prefer appspot because reasons I don't know.