Harvest Moon: Animal Parade Hints for Wii
To do this, you will need a cutting board. Catch a large amount of cheap fish. A good example of this would be the pond smelt, which sells for a measley 7G.
Put a single fish onto the cutting board, press the "Select" option, and presto! You have shashimi, which sells for a decent 80G. Make a dozen or so of this and you will have money to burn the next day.