All Recording Rarities fish locations in Dredge

The Dredge Recording Rarities pursuit is your classic 'sail to the four corners of the world to find the legends residing there' quest. In this case, those legends are four massive fish the travelling merchant asks you to catch, and for each one you show to her you'll get two Research Parts with which to unlock new gadgets for your boat. You can also sell each fish for around $250, meaning if you catch all four you'll be swimming in cash...
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