Fish genders? Guesses?

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Brisbane, Australia
The picture enclosed is of my two fish that will be moving into a pond soon. I'm not sure if I actually want them to breed or not but I would like to know their genders, if possible... They are about 15 cm (3 to 4 in) long from head to tip of the tail.

Additional questions:

Will having a belly full of eggs and not having a male to spawn with cause health problems?

Will any females get injured with the males chasing her around because I've read that koi fish get injured?

Should I seperate the fish (male with the egg-filled female) in a seperate spawn/hatchery cage or pond or something if I want them to spawn? Will they spawn anyway, even if a couple of males "want in on the action" so to speak?

Is there a suggested male:female ratio?
 

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