MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY
Striped triplefin fish (Helcogramma striata) next to a colony of encrusting white mark sea squirts (Eusynstyela cf. This fish is found throughout the tropical Indo-Pacific. It feeds on zooplankton and grows up to 4 centimetres in length. Photographed in Seraya, Bali, Indonesia.
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