You'll need Fish if you want to complete any sort of building or resource upgrades on the island of Berk. You mainly get Fish by removing fishing with Dragons, upgrading your Dragons and using them to collect larger amounts of fish per hour. Upgrading the Fish Basin will allow you to increase your capacity for Fish Hut upgrades. You can also earn extra fish through expanding to other islands (with more vikings).
Choosing the Best Dragon for the Job
Identifying the best Dragon for the job comes down to their level, specialty and the yield per hour for fish. One of the first Dragons you get is Monstrous Nightmare. Primarily used for collecting fish, Monstrous Nightmare is a fast but frail yielding 2,700 fish per an hour. As you unlock more Dragons from your visits to other islands, you'll have a larger variety to choose from. Unlocking the Terrible Terror dragon from Meathead Islands, who is smaller but has a higher fish yield, has two specialties, Fish and Wood that yields 3,100 fish per an hour. Terrible Terror is the best choice, allowing you to collect more fish during a shorter period of time.As your Dragons level up, your fish resource yields will change with each level. Upgrading dragons will increase yields and unlock new specialties. Knowing each dragon's specialties, yield amounts and speed will help you grow the town of Berk even faster.