muscovy duck problems

[Americano Blue]

I have 2 female Muscovy duck that i use for eggs, today a brought home a male Muscovy. my fist problem is as soon as i put him with my ducks, one of them started attacking him. How do i get them to get along?
my 2nd problem is how to i keep them from breeding? the male is 2x as big as the females.

 

[Amiga]

They need to be separated, certainly right now.

It takes time for ducks to get used to each other.