Update 2018-07-06: As of the 2nd Anniversary Event update, it appears the “visiting” fish like the Marlin have a vastly increased appearance rate. Hopefully they should no longer be an issue.
More than any other fish the Striped Marlin in Tap Tap Fish: Abyssrium has driven fans (and by extension, me) insane. So I decided hey, just make a single, extremely direct post to gather all the information into one place. If you’re looking for info on Hidden Fish in general, or any other game info, see my complete AbyssRium Guide.
tl;dr: There is absolutely nothing you can do to increase your chance of seeing the marlin (other than own the star horn coral which is required).
Since the early days, the following fish were added, all of which work completely identically to the Marlin and are unlocked in a possibly random sequence:
- Striped Marlin
- Yellow Fin Tuna
- Blue Fin Tuna
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