You are allowed to go fishing every 15 minutes. There is a countdown timer in the right-hand corner that will let you know when you fish. Simply click the "Fish Now" button and read your results.
You must be stocked with Chum in order to go fishing. Click the "Store->Chum" tab above and you can purchase different types of chum. You will not always catch a fish every time you go fishing - your chum can be stolen or your chum can fail to attract a fish to your line.
An important part of the game is to expand your Crew, which is done by inviting friends to the application. Your friends (Crew Members) can take you fishing an additional two times an hour.
Earn more points and gold by catching different fish. You will receive a larger reward when you catch rarer fish. The "Fish List" tab gives details on each fish. The fish image will not be displayed until you catch the particular fish.
Your points and gold will increase as you advance in the game. Point totals indicate your overall rank in the game, while gold is the currency in the game. Use your gold to purchase upgraded fishing equipment.