For Florida law it may be, this is FEDERAL which surpasses all state laws
here's just a small exert off the page
SUMMARY: We, the U.S. Fish and
Wildlife Service, change the regulations
governing control of introduced
migratory birds. The muscovy duck
(Cairina moschata) occurs naturally
only in southern Texas. It has been
introduced in other locations, where it
is considered an invasive species that
sometimes creates problems through
competition with native species,
damage to property, and transmission of
disease.
We amend the regulations to
prohibit sale, transfer, or propagation of
muscovy ducks for hunting and any
other purpose other than foodproduction, and to allow their removal
in locations in which the species does
not occur naturally in the contiguous
United States, Alaska, and Hawaii, and
in U.S. territories and possessions. This
requires revision of regulations
governing permit exceptions for captivebred
migratory waterfowl other than
mallard ducks, and waterfowl sale and
disposal permits, and the addition of an
order to allow control of muscovy
you can go to
http://www.fws.gov/migratorybirds/R...2010/Muscovy Duck Final Rule 1 March 2010.pdf
for the full write up on them
as for the rouens, they vocalize just like mallards, all breeds other than muscovies do as they are all mallards if the truth be known.
I'm pretty sure it has scovie in it, as I mentioned, just not a lot, maybe 25%. If it's that heavy already, the mallard cross is a definate no, got to be rouen x muscovy