I'm fairly certain (but could be wrong) that all of the new Big Fish are i80 and all give the same desynth exp. Frilled Shark should give the same exp as a Twitchbeard even though it's much harder to catch since they are both the same ilvl. It may seem odd, but it's the same with other classes. i90 items that take super rare items like a Throne Gem or Waterproof Cotton still give the same exp as items that use much more common materials. Why? They're both i90.