- "Fish" was renamed to "Aquatic Creatures" inside the Omnidex.
- Season tags were added to all Aquatic Creatures.
- 47 new Aquatic Creatures were added:
- 25 Freshwater:
- Chum Salmon
- Pond Smelt
- Kaluga
- Arapaima
- Cherry Salmon
- Zebrafish
- Noodlefish
- Obscure Pufferfish
- Goldfish
- Alligator Gar
- Rainbow Shiner
- Silver Pacu
- Gold Leopard Dojo Loach
- Red Garra
- Mint Tetra
- Burton's Mouthbrooder
- Lyretail Killifish
- Redfin Pickerel
- Shiro Utsuri Koi
- Argus Snakehead
- Silver Arowana
- Giant Freshwater Stingray
- Whitespotted Pike
- Blackspotted Pike
- Spaghetti Eel
- 22 Saltwater:
- Cod
- Tiger Puffer
- Orangeback Fairy-Wrasse
- Smallscale Toothfish
- Seagrass Wrasse
- Yellowfin Seabream
- Red Stingray
- Snowflake Moray
- Ocean Sunfish
- Leopard Coral Grouper
- Pinktail Triggerfish
- Brown-Marbled Grouper
- King Salmon
- Orangeside Triggerfish
- Half-And-Half Chromis
- Leopard Flounder
- Peacock Sole
- Bluespotted Ribbontail Ray
- Round Ribbontail Ray
- Peacock Flounder
- Bluefin Tuna
- Sheepshead Wrasse
- 25 Freshwater:
- Weather tags were added to all Fish.
- 25 New Fish were added:
- 14 Freshwater:
- 034: Red-Spotted Loach
- 035: Eel Loach
- 036: Yellow Dappled Koi
- 037: Hooksnout Carp
- 038: Light's Bitterling
- 039: River Tonguesole
- 040: Dwarf Snakehead
- 041: Sharpbelly
- 042: River Trout
- 043: Red-Striped Perch
- 044: Spined Loach
- 045: Electric Yellow Cichlid
- 046: Hummingbird Tetra
- 047: Royal Tetra
- 11 Saltwater:
- 082: Yellow Boxfish
- 083: Milkfish
- 084: Clownfish
- 085: Barred Spinefoot
- 086: Giant Bluefin Tuna
- 087: Fairy Basslet
- 088: Turbot
- 089: Blacksaddled Coralgrouper
- 090: Gray Angelfish
- 091: Largetooth Flounder
- 092: Unicorn Sole
- 14 Freshwater:
- Fish was released.