You will see the male collecting the fry and blowing them back into the nest when they make little dashes away from the it. Once you can see that he is constantly on the chase collecting them they are in danger of being eaten in his frustration. Then is the time to remove him.
First of all, male "ducks" are called drakes. If the female is currently laying on her eggs trying to hatch them, it should be fine to leave the male around. If she's not take away the eggs from her. Unless they are fighting the male is fine.
you decide
remove the anthers
Eggs should be chilled before dying. Ideally you would hard boil the eggs before dying them or empty the raw egg to remove the yolk.
Yes, then clean the box.
yes that is the safest thing to do!
If they froze solid then there is little point in allowing her to waste the next 21 days trying to hatch non viable eggs. If you remove the eggs she will start to lay more to replace them or go off brood altogether. If the eggs merely got cold then she may continue to brood with only some reduction in a full hatch.
sometimes with chickens any way take them away from the eggs into a new location temp. and when they have forgotton put them back and there fine unless re introducing them to the flock gets them picked on
No they wouldn't because they might or could get sick so you should throw the eggs away immediately.
When there are all the eggs laid, remove the male from the cage and keep him separate.
Take them out of the tank and separate them. They'll most likely eat the babies.
depends on how they did it. Did they remove your ovaries? If not your ovaries will produce more eggs. They can not remove all of them unless they remove your ovaries. Then you will no longer produce eggs.