Fish in the River during Fall
Fish in the River during Winter
Fish in the River during Spring when using a Rain Totem
Fish in the River from 12:00 PM to 2:00 AM
Fish in Pelican Town, Cindersap Forest, or the Mountain Lake river sections
Use a Rain Totem to make Fall rainy if needed
Use a Fishing Buff food item to increase fishing level
Use a better fishing rod and tackle
Check the Weather Report for rainy days
Catch it in the evening or night for better availability