The fish is a popular symbol which is included within the Tarot and I think its very important to find your own meaning for the fish. For me a way to establish this knowledge is to look back at history and different cultures and see how they interpret the fish.

Within Buddhism the fish is a sign of happiness as they have absolute free reign to swim in the oceans, freedom being an important  aspect in life. Also the fish is a sign of fertility for its rich abundance of fish eggs. In contrast the fish can been seen a fearless force swimming out into the unknown, within Indian tradition. In China they eat fish for the chinese new year, this a symbol good luck and surplus, meaning plenty and abundance.