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Here are all locations for catching them:
Emperor Salmon
Krasarang Wilds, Townlong Steppes (Inland), Vale of Eternal Blossoms, Valley of the Four Winds
Giant Mantis Shrimp
Dread Wastes (Coastal), The Jade Forest (Coastal), Krasarang Wilds, Kun-Lai Summit (Coastal), Townlong Steppes (Coastal), Valley of the Four Winds
Jade Lungfish
The Jade Forest (Inland)
Krasarang Paddlefish
Krasarang Wilds (Inland), Valley of the Four Winds (Inland) , Vale of Eternal Blossoms (Inland)
Redbelly Mandarin
The Jade Forest (Inland), Townlong Steppes (Inland), Vale of Eternal Blossoms (Inland)
Spinefish Alpha
Dread Wastes (Inland), The Jade Forest (Widow's Wail), Kun-Lai Summit (Sha-Touched)
Flying Tiger Gourami
The Jade Forest (Inland) , Krasarang Wilds, Valley of the Four Winds, Townlong Steppes (Inland), Kun-Lai Summit (Inland), The Veiled Stair, Vale of Eternal Blossoms
Golden Carp
Kun-Lai Summit (Inland), The Veiled Stair, The Jade Forest (Inland), Krasarang Wilds, Valley of the Four Winds, Townlong Steppes (Inland), Vale of Eternal Blossoms, Dread Wastes (Coastal), The Jade Forest (Coastal), Krasarang Wilds, Kun-Lai Summit (Coastal), Townlong Steppes (Coastal), Valley of the Four Winds, Dread Wastes (Inland), The Jade Forest (Widow's Wail), Kun-Lai Summit (Sha-Touched)
Jewel Danio
Vale of Eternal Blossoms (Inland)
Mimic Octopus
Dread Wastes (Coastal), The Jade Forest (Coastal), Krasarang Wilds, Kun-Lai Summit (Coastal), Townlong Steppes (Coastal), Valley of the Four Winds
Reef Octopus
Dread Wastes (Coastal), The Jade Forest (Coastal), Krasarang Wilds, Kun-Lai Summit (Coastal), Townlong Steppes (Coastal), Valley of the Four Winds
Tiger Gourami
Kun-Lai Summit (Inland), The Veiled Stair
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Source: Elsanglin