🐠 Blue Line Angelfish (Chaetodontoplus septentrionalis)
A Mustard-Yellow Body Crossed by Dazzling Electric-Blue Stripes • A Bright Yellow Tail • A Rare, Seasonal Centrepiece
 
📋 The Blue Line Angelfish, also known as the Bluestripe or Bluebanded Angelfish, is a striking marine angelfish with a mustard-yellow to tan body crossed by dazzling electric-blue horizontal stripes, and a bright yellow tail. Juveniles look strikingly different, deep black bodies with shimmering blue stripes and a yellow band behind the eyes, which fades once the fish reaches around 2.5-3 inches.
It comes from shallow, rocky coastal reefs across the Western Pacific, particularly around Japan, Taiwan, Vietnam, and the South China Sea, uncommon in the trade, with availability typically limited to the summer and autumn months. Every Blue Line Angelfish we ship is feeding well, and we offer several small feedings daily during the initial acclimation period to help it settle.
It's not reef safe, and will nip at clam mantles, LPS and SPS corals, and some soft corals, making it best suited to a spacious fish-only or FOWLR aquarium. It's a relatively hardy angelfish once properly acclimated, and adapts well to captivity given the right environment. As with most large angelfish, it should be kept singly. For keepers with a large, appropriately set-up fish-only tank, this is a special, sought-after centrepiece species. It reaches up to 20cm, so plan on at least 680L.
 
💡 Highlights
💙💛 Dazzling Electric Blue Stripes: Bold horizontal banding over a yellow-tan body
💎 Rare: Seasonal availability, typically summer and autumn only
⚠️ Not Reef Safe: Will nip at clam mantles, LPS, SPS, and some soft corals
🐟 Relatively Hardy Once Settled: Adapts well to captivity with proper acclimation
👶 Dramatic Juvenile-to-Adult Change: Black-and-blue juveniles transform into the adult pattern