Chaetognaths (common name arrowworms) were extremely abundant on the midwater dives in the Musicians Seamounts region, inhabiting a broad depth range. Deeper-dwelling species tend to be more pigmented (red/orange, right) while shallower species are often transparent (left). These variations in coloration are adaptations to the ambient environments. Red animals appear black in the poorly lit deep ocean, which helps them camouflage in their environment, while transparency is a good strategy to stay hidden in better-lit shallower water.

Chaetognaths (common name "arrowworms") were extremely abundant on the midwater dives in the Musicians Seamounts region, inhabiting a broad depth range. Deeper-dwelling species tend to be more pigmented (red/orange, right) while shallower species are often transparent (left). These variations in coloration are adaptations to the ambient environments. Red animals appear black in the poorly lit deep ocean, which helps them camouflage in their environment, while transparency is a good strategy to stay hidden in better-lit shallower water. Left image courtesy of the NOAA Office of Ocean Exploration and Research, Deep-Sea Symphony: Exploring the Musicians Seamounts. Right image courtesy of the NOAA Office of Ocean Exploration and Research, 2017 Laulima O Ka Moana.

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Related Links

September 23: Explorations Far Above the Musician Seamounts: A Crescendo for Midwater Explorers

Deep-Sea Symphony: Exploring the Musicians Seamounts

NOAA Ship Okeanos Explorer