Joseph Leverton on Instagram: "Juvenile Red Sea Bannerfish (Heniochus intermedius) are smaller but just as striking as adults, with their signature long dorsal filament already trailing behind them. These reef fish often swim in pairs and are sometimes mistaken for juvenile angelfish or butterflyfish. As they grow, they maintain their bold black and white stripes and yellow fins a vibrant splash of contrast on the reef! 🐠 Filmed with an IPhone 15 PRO in a @divevolk Seatouch 4 housing! #RedSeaBa

Understanding the Doppler Effect in Sound and Light