Types of Fish

After successfully fishing, you would be shown a page of the fish's description if it is new. Later you would see repeat images of fish due to their level. You can check every description after successfully fishing in the log. To access the log, tap your rank and press the last tap with the fish icon.

There are at least 3 categories: Normal, Rare, and Boss.

Normal Fish
Normal fish typically found anywhere and has no specific location. However, some normal fish will only appear after you have reached a specific rank (i.e. R0, R1, R2...). Fish you can catch at Rank 0 and above are:

These fish however despite their name, are not based on fish in real life.

Rare Fish
Rare fish can only be found in specific locations after you've caught the boss fish first. Note: After fishing in Center of Altar, there will be no more rare fish past the area.

Boss Fish
Like Rare fish, Boss fish can only be found in specific areas. They can be re-caught again alongside the rare fish.

Legendary Fish
Legendary fish can only be caught if you have enough Traces of Legend. You will be prompted to visit a Thunderstorm in order to "catch" the legendary fish. Successfully doing so will give you Amber stones for Altars, which give various benefits. Like other fish, Legendary fish have timers on their health bar, however, their health bar "fills" rather than depletes. Filling the bars will give you more Amber stones and increase the hitpoints needed to get more. Also be aware that you are engaged in actual combat with them - if their attacks hit you, your time to fight them decreases, but you can defend against their attacks by tapping the attack particles (musical notes, etc). There are currently 2 Legendary Fish.