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Rainbow Wrack

HomeMarine Algae & SeagrassRainbow Wrack

Rainbow Wrack

Cystoseira tamariscifolia

This seaweed is renowned for its shimmering hues, which can shift between blue, green, and bronze in bright light. Its delicate, branching fronds create a safe haven for small marine creatures like crustaceans and juvenile fish. Around Lihou, you might spot it in wave-exposed pools where oxygen-rich waters support its vivid, iridescent display.

  • Habitat: Lower shore to shallow subtidal on rocky coasts, often in wave-exposed areas.
  • When to See: Present year-round, with more vigorous growth in spring and summer.
  • Length: Fronds typically 10–30 cm long, forming bushy tufts.