A small school of cardinal fish slowly moves in the water column near the seabed overgrown with anemones. Ring-Tailed Cardinalfish (Ostorhinchus aureus). Small schools near shallow coral outcrops.

What you’re looking at here is a Sydney Cardinalfish (Ostorhinchus Limenus) with a parasitic isopod (Cymothoid sp.) attached to its head. The parasite will eat the flesh of its host, causing the cardinalfish some discomfort as well as a constant drain on its energy. Studies suggest that Cardinalfish found with this parasite do not grow as large as their unaffected peers. It is believed that this is due to several factors; they require more food to survive with the parasite always siphoning off s

Against the background of the water surface, a school of fish swims near the anemones growing on the bottom of the sea. Ring-Tailed Cardinalfish (Ostorhinchus aureus).

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A school of fish hides inside car tires on an artificial reef created by humans on the seabed. Ring-Tailed Cardinalfish (Ostorhinchus aureus) 15 cm. Small schools near shallow coral outcrops.

Next to the anemones growing on the bottom of the sea, a large school of fish swims in the rays of the sun. Ring-Tailed Cardinalfish (Ostorhinchus aureus). Small schools near shallow coral outcrops.

Tropical Reef Camera - live underwater video of fish & coral | Explore.org