A Black Reef Leatherjacket, Eubalichthys bucephalus, at Jervis Bay.
Flicking the dorsal fin spine back and forwards is usually a sign of aggression. Most likely the two fish in the movie are both males. Thank you to Dr Barry Hutchins for his comments on this behaviour.
Last Updated: 25 September 2009
Black Reef Leatherjacket,
+612 9320 6000
6 College St Sydney,
NSW 2010 Australia
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