I recorded approx 500 of these on a survey at Captains Point Jervis Bay recently. They followed me for the entire survey, which is barracuda-like behaviour (cf longfin pike which don't tend to follow you).
ID by RSS from RLS who said could also be S obtusata, but FoA website says these may be synonyms.
NB: range TBA for this species, but what interests me is if it IS a range extension, does it mean that a whole school came south together via the EAC (cf the occasional solitary visitor or larvae / small juveniles)?