@Victor- I've just read an article fr "wildonfly" magz 2003 edition provided by Budi fly about this particular fly...and it's exactly what jim said about the effectivenss for wild milkfish.
@Jim-I had once spotted the wild one while wading at P. Laki.. and it was tailing and may be feeding for the little crustacean or seaweed...Unfortunately I was targetting into something else...(read : cumi2)...distance from me abt 2-3 meter away and it were abt 3-5 school of big ones... I'b never experience again since.

Some folks told me tt in Shangyang island were occasionally spotted also for this milkfish...