Marine fish, also known as saltwater fish, are varieties of fish that live in seawater habitats. They are regarded to be the most diverse and colorful group of fish species, accounting for more than half of the total fish species. If you're looking for synonyms for the word 'marine fish,' you could consider some of the following options: saltwater fish, aquatic fauna, oceanic fish, pelagic species, sea creatures, and deep-sea denizens. Each of these synonyms conveys an element of the unique beauty and complexity of these creatures. From sparkling shimmers to vibrant hues, these fish are a pleasure to observe and marvel at.