Pliosaur

The Pliosaur is flagged as a Hunt fish, and the numbers show why: its maximum weight of 1,863,750 kg puts it 13th of 663 fish with a recorded maximum. This Exotic catch lives in Tidefall, bites only at Night in Foggy weather during Winter, and wants Shark Head as bait. The in-game text describes a monstrous marine reptile from the age of dinosaurs, with a skull larger than a man and crushing jaws.

Weight ranges from 60,000 kg up to that 1,863,750 kg ceiling, averaging 175,000 kg. Price per kilogram is tiny at C$0.18, but mass does the work: an average Pliosaur sells for C$31,500 and grants 36,000 base XP. It is 52nd of the 742 documented fish by average value, firmly in the top tier.

Goldwraith is the other Exotic fish listed for Tidefall, and Fallen Rod is sold in the same zone, so the matching gear is within reach.

This is a serious target, not a casual one. Four conditions must line up (Winter, Night, Foggy weather and Shark Head), and you should expect a long fight against a very heavy fish. The payoff justifies the prep: C$31,500 and 36,000 XP in one catch is well above what routine fishing returns. If you already hunt in Tidefall, plan your session around this.