for Victoria (ducks)

Hi Victoria,
I live in a marshy area of Argentina and am about to get into duck production. I have deside almost for sure to go with Pekins, but I would like to have your opinion: I am looking for a good egg production (a reasonable amount of meat in the drakens would be good for sell, but is not the top priority), a hardy bird wich could forage for all or near to all its food (they will have all the marshes they could possibly dream of, plus river, lots of big, big snails and frogs). The weather is mild, with no snow in winter (a few days here and there with 0ºC/32F or a little under that) and a summer with maximun of 40º C/104F some days, rain and fluds are comun, that's about it I guess. I wonder also what your opinion might be about the Foruno method (the power of duck) of mixing ducklings with fish in a paddy.
So, what do you think? is Pekin the right breed for my requirements? Oh, I almost forgot: I would rather they don't fly
Thank you