Whether found in rivers, lakes or the sea, many different species of fish can be found in Animal Crossing: New Horizons.
Some are more readily available than others, and it can be complicated to complete your museum's aquarium. That's why we've put together this guide to all the fish you can catch in New Horizons, to make your life on your island paradise easier!
NOTE: As this is a long list, feel free to use CTRL+F and type the name of the fish you are looking for to find it more easily!

When: November-March (Northern) / May-September (Southern)
Time: All day
Location: River
Price: 900 bells

When: Year-round (Northern and Southern)
Time: 9 a.m. - 4 p.m.
Location: River
Price: 160 bells

When: Year-round (Northern and Southern)
Time: All day
Location: River
Price: 160 bells

When: Year-round (Northern and Southern)
Time: 4 p.m. - 9 a.m.
Location: River
Price: 240 bells

When: Year-round (Northern and Southern)
Time: All day
Location: Pond
Price: 300 bells

When: Year-round (Northern and Southern)
Time: 4 p.m. - 9 a.m.
Location: Pond
Price: 4,000 bells

When: Year-round (Northern and Southern)
Time: All day
Location: Pond
Price: 1,300 bells

When: Year-round (Northern and Southern)
Time: 9 a.m. - 4 p.m.
Location: Pond
Price: 1,300 bells

When: Year-round (Northern and Southern)
Time: 9 a.m. - 4 p.m.
Location: Pond
Price: 4,500 bells

When: April-August (Northern) / October-February (Southern)
Time: All Day
Location: Pond
Price: 300 bells

When: April-September (Northern) / October-March (Southern)
Time: All Day
Location: Pond
Price: 200 bells

When: August-September (Northern) / February-March (Southern)
Time: 4 p.m. - 9 a.m.
Location: River
Price: 3,750 bells

When: April-October (Northern) / October-April (Southern)
Time: 9 a.m. - 4 a.m.
Location: River
Price: 5,000 bells

When: March-July (Northern) / September-January (Southern)
Time: All day
Location: Pond
Price: 100 bells

When: May-August (Northern) / November-Feburary (Southern)
Time: All day
Location: Pond
Price: ??? bells

When: Year-round (Northern and Southern)
Time: 4 p.m. - 9 a.m.
Location: River
Price: 400 bells

When: March-May (Northern) / September-November (Southern)
Time: All day
Location: River
Price: 400 bells

When: May-October (Northern) / November-April (Southern)
Time: 4 p.m. - 9 a.m.
Location: Pond
Price: 800 bells

When: June-August (Northern) / December-February (Southern)
Time: 9 a.m. - 4 p.m.
Location: Pond
Price: 5500 bells

When: Year-round (Northern and Southern)
Time: 9 a.m. - 4 p.m.
Location: River
Price: 180 bells

When: October-March (Northern) / April-September (Southern)
Time: All day
Location: River
Price: 300 bells

When: Year-round (Northern and Southern)
Time: All day
Location: River
Price: 400 bells

When: June-October (Northern) / December-April (Southern)
Time: All day
Location: River
Price: 800 bells

When: September-December (Northern) / March-June (Southern)
Time: All day
Location: River
Price: 1,800 bells

When: December-February (Northern) / June-August (Southern)
Time: All day
Location: River
Price: 160 bells

When: July-September (Northern) / January-March (Southern)
Time: All day
Location: River
Price: 900 bells

When: March-June, September-November (Northern) / March-May, September-December (Southern)
Time: All day
Location: River
Price: 1,000 bells

When: March-June, September-November (Northern) / March-May, September-December (Southern)
Time: 4 p.m. - 9 a.m.
Location: River/Pond
Price: 3,800 bells

When: March-June, September-November (Northern) / March-May, September-December (Southern)
Time: 4 p.m. - 9 a.m.
Location: River (Clifftop)
Price: 15,000 bells

When: December-March (Northern) / June-September (Southern)
Time: 4 p.m. - 9 a.m.
Location: River (Clifftop)
Price: 15,000 bells

When: September (Northern) / March (Southern)
Time: All day
Location: River (mouth)
Price: 700 bells

When: September (Northern) / March (Southern)
Time: All day
Location: River (mouth)
Price: 1,800 bells

When: September-November (Northern) / March-May (Southern)
Time: 4 p.m. - 9 a.m.
Location: River
Price: 2,000 bells

When: April-November (Northern) / October-May (Southern)
Time: 9 a.m. - 4 p.m.
Location: River
Price: 1,300 bells

When: May-September (Northern) / November-March (Southern)
Time: 9 a.m. - 4 p.m.
Location: River
Price: 1,500 bells

When: May-October (Northern) / November-April (Southern)
Time: 4 p.m. - 9 a.m.
Location: River
Price: 3,000 bells

When: May-October (Northern) / November-April (Southern)
Time: 9 a.m. - 4 p.m.
Location: River
Price: 2,500 bells

When: April-November (Northern) / October-May (Southern)
Time: 9 a.m. - 4 p.m.
Location: River
Price: 500 bells

When: May-October (Northern) / November-April (Southern)
Time: 9 a.m. - 4 p.m.
Location: River
Price: 800 bells

When: June-September (Northern) / December-March (Southern)
Time: 9 a.m. - 4 p.m./ 9 p.m. - 4 a.m.
Location: River
Price: 2,500 bells

When: June-September (Northern) / December-March (Southern)
Time: 4 p.m. - 9 a.m.
Location: River
Price: 10,000 bells

When: June-September (Northern) / December-March (Southern)
Time: 4 a.m - 9 p.m.
Location: River
Price: 15,000 bells

When: July-October (Northern) / January-April (Southern)
Time: 4 p.m. - 9 a.m.
Location: Pond
Price: 6,000 bells

When: June-September (Northern) / December-March (Southern)
Time: 4 p.m. - 9 a.m.
Location: River
Price: 10,000 bells

When: December-March (Northern) / June-September (Southern)
Time: 9 p.m. - 4 a.m.
Location: River
Price: 4,000 bells

When: September-March (Northern) / March-September (Southern)
Time: All day
Location: River (mouth)
Price: 10,000 bells
Sea

When: December-March (Northern) / June-September (Southern)
Time: All day
Location: Sea
Price: 1,000 bells

When: April-November (Northern) / October-May (Southern)
Time: All day
Location: Sea
Price: 1,100 bells

When: April-September (Northern) / October-March (Southern)
Time: All day
Location: Sea
Price: 650 bells

When: April-September (Northern) / October-March (Southern)
Time: All day
Location: Sea
Price: 1,000 bells

When: April-September (Northern) / October-March (Southern)
Time: All day
Location: Sea
Price: 1,000 bells

When: July-August (Northern) / January-February (Southern)
Time: 4 a.m. - 9 p.m.
Location: Sea
Price: 10,000 bells

When: April-November (Northern) / October-May (Southern)
Time: All day
Location: Sea
Price: 500 bells

When: November-February (Northern) / May-August (Southern)
Time: 6 p.m. - 4 a.m.
Location: Sea
Price: 5,000 bells

When: July-September (Northern) / January-March (Southern)
Time: All day
Location: Sea
Price: 250 bells

When: Year-round (Northern and Southern)
Time: 4 a.m. - 9 p.m.
Location: Sea
Price: 200 bells

When: Year-round (Northern and Southern)
Time: All day
Location: Sea
Price: 150 bells

When: March-November (Northern) / September-May (Southern)
Time: All day
Location: Sea
Price: 5,000 bells

When: Year-round (Northern and Southern)
Time: All day
Location: Sea
Price: 400 bells

When: Year-round (Northern and Southern)
Time: All day
Location: Sea
Price: 3,000 bells

When: October-April (Northern) / April-October (Southern)
Time: All day
Location: Sea
Price: 300 bells

When: Year-round (Northern and Southern)
Time: All day
Location: Sea
Price: 800 bells

When: December-August (Northern) / June-February (Southern)
Time: All day
Location: Sea
Price: 500 bells

When: August-October (Northern) / February-April (Southern)
Time: All day
Location: Sea
Price: 2,000 bells

When: June-October (Northern) / December-April (Southern)
Time: All day
Location: Sea
Price: 600 bells

When: November-April (Northern) / May-October (Southern)
Time: All day
Location: Pier
Price: 7,000 bells

When: July-September, November-April (Northern) / January-March, May-November (Southern)
Time: All day
Location: Pier
Price: 10,000 bells

When: May-October (Northern) / November-April (Southern)
Time: All day
Location: Pier
Price: 4,500 bells

When: May-October (Northern) / November-April (Southern)
Time: All day
Location: Sea
Price: 6,000 bells

When: July-September (Northern) / January-March (Southern)
Time: 4 a.m. - 9 p.m.
Location: Sea
Price: 4,000 bells

When: August-November (Northern) / February-May (Southern)
Time: 4 a.m. - 9 p.m.
Location: Sea
Price: 3,000 bells

When: June-September (Northern) / December-March (Southern)
Time: 4 p.m. - 9 a.m.
Location: Sea
Price: 12,000 bells

When: June-September (Northern) / December-March (Southern)
Time: 4 p.m. - 9 a.m.
Location: Sea
Price: 8,000 bells

When: June-September (Northern) / December-March (Southern)
Time: 4 p.m. - 9 a.m.
Location: Sea
Price: 15,000 bells

When: June-September (Northern) / December-March (Southern)
Time: All day
Location: Sea
Price: 13,000 bells

When: June-September (Northern) / December-March (Southern)
Time: All day
Location: Sea
Price: 1,500 bells

When: November-March (Northern) / May-September (Southern)
Time: 4 p.m. - 9 a.m.
Location: Sea
Price: 2,500 bells

When: December-May (Northern) / June-November (Southern)
Time: All day
Location: Sea
Price: 9,000 bells

When: Year-round (Northern and Southern)
Time: 9 p.m. - 4 a.m.
Location: Sea
Price: 15,000 bells

When: Year-round (Northern and Southern)
Time: All day (only rainy day)
Location: Sea
Price: 15,000 bells
Now your Aquarium is complete, check out our other guides to help you complete the bug or fossil sides of the Museum, or help you with any other aspect of island life!