As a fishmonger, I go to Billingsgate Fish Market every day and can choose from a good assortment of fresh fish. They in turn, buy from ports around the country and around the world. This means that most fish are constantly available. The biggest problem in this cycle is the weather. It is this that plays the most important part in the availability of the fresh fish delivered to you.
Here are some of the more common fish that are available all year round.