This is the list of fish I've found, researched, and proven to be correct, along with the requirements to catch them. As I edit this page, I'll work on cleaning if up and formatting the information. However, the list comes first. (All times are Eorzean Time)BCM=Best Catch Method

Gathering 301+:
Octomammoth-Limsa Lominsa Lower Decks-7a.m. to 5p.m.-Any Weather-BCM: Lugworm=Mooch(Merlthor Goby/Harbor Herring)

Great Gudgeon-Mid La Noscea(21,16):West Ageless River- Any time-Any weather-BCM:Crayfish ball

Gigantshark-Mid La Noscea(15,17):Summerford-Any time-Clear/Fair weather-BCM:Floating Minnow=Mooch[A(Merlthor Goby)/B(Harbor Herring)/C(Harbor Herring=Mooch{Ogre Barracuda})]

High Perch-Mid La Noscea(17,14):Nym River-5a.m. to 8a.m.-Any Weather-BCM:Sinking Minnow

Crystal Perch-Mid La Noscea(21,12):Woad Whisper Canyon-Any time-Wind, Fog, Overcast-BCM:Butterworm

Caterwauler-Lower La Noscea(24,23):Mourning Widow-Any time-Any weather-BCM:Moth Pupa

Oschon's Print-Lower La Noscea(26,26):Moraby Bay-Any time-Any weather-BCM:Goby Ball

Silver Sovereign-Lower La Noscea(20,20):Oschon's Torch-Any time-Any weather-BCM:Yumizuno between 6p.m. and 6a.m.

Sabertooth Cod-Lower La Noscea(20,39):Candlekeep Quay-4p.m. to 10p.m.-any weather-BCM:Rat Tail