Class Quests:
Level 1 Guild Quest:
Fish: 5 Lominsan Anchovy
Location: Limsa Lominsa (Upper or Lower)
Requesting NPC: Sisipu
Recommended Bait: Lugworm (Purchasable from Fieldcraft Vendor in Market Ward)
Level 5 Guild Quest:
Fish: 3 Harbor Herrrings
Requesting NPC: Sisipu
Location: Limsa Lominsa (Upper or Lower)
Recommended Bait: Pill Bugs (Purchasable from Fieldcraft Vendor in Market Ward)
Level 10 Guild Quest:
Fish: 1 HQ Princess Trout
Requesting NPC: Sisipu
Location: Rivers in La Noscea (Middle or Lower)
Recommended Bait: Crayfish Balls (Purchasable from Fieldcraft Vendor in Market Ward or crafted by a level 5 Culinarian)
Notes: Crayfish Balls were the bait reward from the level 5 quest. Leveling from 5-10 can be done quickly and easily in La Noscea so take your bait and head out there.
Level 15 Guild Quest:
Fish: 5 Navigator's Dagger
Location: Brewer's Beacon (Western La Noscea - Near Aleport)
Requesting NPC: Chuchuroon
Recommended Bait: Rat Tails (Quest reward from previous Class Quest. Purchasable from Merchant & Mender in Aleport.)
Notes: The quest says go to Skull Valley but its a trick. The area around Brewer's Beacon has a number of aggressive Buzzards. Use stealth or randomly die.
Level 20 Guild Quest:
Fish: 5 Warmwater Trout
Location: Oakwood (Upper La Noscea)
Requesting NPC: Chuchuroon
Recommended Bait: Crow Fly Lure (Purchasable from Junkmonger in Oakwood or craftable via Goldsmith)
Notes:
Level 25 Guild Quest:
Fish: Shadow Catfish
Location: North Shroud (Fallgourd Float)
Requesting NPC: Chuchuroon
Recommended Bait: Crayfish Balls > Striped Goby HQ > Mooch
Grinding: Grind at Costa Del Sol->South Bloodshore until 30
Notes:
Level 30 Guild Quest:
Fish: 10 Fullmoon Sardines
Location: Eastern La Noscea (Costa del Sol)
Requesting NPC: Tocktix
Recommended Bait: Spoon Worms (Purchasable in Costa del Sol)
Grinding: Grind at Costa Del Sol->South Bloodshore using until 35
Notes: Anywhere on the coast in South Bloodshore (by the cancer crab fate) Only after 6PM Eorzea Time
Level 35 Guild Quest:
Fish: Desert Catfish
Location: Southern Thanalan (Sagoli Dunes)
Requesting NPC: Tocktix
Recommended Bait: Sand Leech (Found in Forgotten Springs)
Notes: Loc @ East of Byregot near Sundrakes
Notes: U'goromuli is in Forgotten Springs
Grinding: Grind at Costa Del Sol->Costa Del sol using Iron Jig until 45
Results (Sand Leech):
Sand Bream 36, Desert Catfish 37, Dustfish 38, Storm Rider 39, Antlion Slug 40, Storm Rider HQ->Mooch->Dune Manta 41, Storm Rider HQ->Mooch->Caravan Eel 50
Level 40 Guild Quest:
Fish: 5 Raincallers
Location: New Gridania (Jadeite Flood)
Requesting NPC: Sybell
Recommended Bait: Stem Borers (buy these in any 40+ aetheryte hub)
Notes: Only happy when it rains
Grinding: Grind at Costa Del Sol->North Bloodshore using Iron Jig until 45
Level 45 Guild Quest:
Fish: 5 Cloud Cutters
Location: Coerthas Central Highlands (Whitebrim Front)
Fishing zone: Sea of Clouds
Requesting NPC: Sybell
Recommended Bait: Hoverworms
Notes: Skyfishing! Grind here on hoverworms until 50
Results (Hoverworm):
Cloud Jellyfish 45, Skyfish 47, Cloud Cutter 48, Cloud Cutter HQ->Mooch->Blind Manta 48, Rift Sailor 49
Level 50 Guild Quest:
Fish: Mazlaya Marlin
Location: North Bloodshore (on the mithra bathing suit dancer pier)
Requesting NPC: Sisipu
Recommended Bait: Goby Ball > Mooch > Mooch
Notes:This can be caught with the Iron Jig at level 45+
source: mmoviper.com