vibrant tropical fish swimming gracefully in a clear ocean, showcasing its colorful fins and scales

tropical fish ichthyofauna side view blue colorful aquatic life marine biology fin patterns ocean species underwater biodiversity swimming vibrant colors sea creatures habitat wildlife identification coral reef ecosystems ornamental home aquarium freshwater saltwater schooling environment anatomy diversity natural beautiful exotic behavior fishermen angling collecting fishkeeping ecological studies hobbyist aquarist nature lovers exploration oceanography pet enthusiasts characteristics wonders