Specimens are categorized by weight and rarity tier from Common through Extinct. Mutations multiply passive aquarium cash output beyond the base species value, so an Extinct Prehistoric Shell fish is worth several thousand times a Common Standard Skin fish.
The default Shallow Pond catch. Useful only as a placeholder before any rarer species is unlocked.
First meaningful aquarium fish. Caught reliably in the Coral Reef with the Reinforced Carbon Rod.
Reliable Deep Trench catch that anchors a mid-game aquarium. Multiplies well with Fluorescent Gills or Predatory Scent mutations.
Mythical-tier catch from the Celestial Void. Becomes a primary income source when stacked with high-tier mutations.
The showcase Extinct-tier specimen. Multiplied further when combined with Prehistoric Shell mutation and Mythical Tide aura.
Keep entries useful by separating source-backed facts, player-tested strategy, and update timing.
Keep rarity, obtain method, abilities, and summary tied to official posts or repeatable in-game testing.
Link fish entries to matching builds, boss routes, and guide sections.
Keep tier values and obtain methods current after each game update.