Honestly, this poor thing probably get the same "torture" as those high shine that you've seen being sold lately. Dye, feeding hormone, or probably "bleach" (who knows) is some of those tricks they do to fish to move them faster...
They're available at LFS from time to time. Just like those "cherry" or "blue" arowana you've seen posted here... Plain old silver arowana with some sort of hocus pocus to get them sold faster... It's hard to sel a baby silver at $30-$40, but if it's made to look different, someone will buy them in a whole lot