Reef pest feasts on ‘sea sawdust’

18 Jul 2024
Two-week old crown-of-thorns starfish larvae under a florescence microscope. The tiny red/pink dots are microalgae food in their stomach.
Two-week old crown-of-thorns starfish larvae under a florescence microscope. The tiny red/pink dots are microalgae food in their stomach. Image: Corinne Lawson, SCU

Researchers have uncovered an under the sea phenomenon where coral-destroying crown-of-thorns starfish larvae have been feasting on blue-green algae bacteria known as ‘sea sawdust’.

The team of marine scientists from The University of Queensland and Southern Cross University found crown-of-thorns starfish (COTS) larvae grow and thrive when raised on an exclusive diet of Trichodesmium – a bacteria that often floats on the ocean’s surface in large slicks.

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