There are numerous synonyms for the phrase "many fish". Some alternatives include "multitude of fish", "abundance of fish", "a lot of fish", "plenty of fish", "a swarm of fish", "a sea of fish", "numerous fish", "countless fish" and "a plethora of fish". These phrases are commonly used when describing a location or situation in which there is a large quantity of fish. Whether talking about a fishing trip or the bustling seafood market, these synonyms effectively communicate the idea of a great number of fish being present. They are also useful for adding variety and interest to written or spoken communication.