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Mark _australia said..I wanna know if you can just go for a swim with your bow, that would make it spearfishing.

Essentially that is not the method designed by legislation here in Australia's states and territories but in the USA dependent the laws of the resources locations' Authority it is under dictate whether sub regulations are breached by committing some method of activity.
The legal classification and laws Bow-fishers must use in New South Wales is "spear-fishing".
I would gather it would be quite odd if it were underwater or more than wading, but a spear fisher is not allowed a visual aid and must use the "device" within its designated method of operation , ODDLY again, actual
"spear guns" MUST "legally" and by manufacturer method of operation decree (how it can only be used)
"load the spear gun under-water submerged".