Was my photo an Asian Grass Carp?

In June last year, I posted a picture of a carp in shallow water off the Leslie Spit. Recent news that two fish belonging to the invasive species Asian grass carp had been caught there made me wonder. How long have they been here? My photo sure looks like one and it had plenty of company.

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Reports emphasized that the pair of Asian grass carp, both male, had been caught in a contained pond. The carp I saw were in the open lake waters.