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How long do koi hold eggs until they release? My friend redid his koi pond a few months ago, moved all the fish over, and now has 1 pregnant koi and 1 pregnant goldfish, as well as an explosion in the minnow population. I've found how long it takes the eggs to mature into fry once they're released, and I've found the methodology used by the fish to release (poor momma koi!), but I can't seem to find how long they hold the eggs for. She's been this way for two weeks, and I'm just wanting make sure she's not egg-bound- I believe that's the correct term. He's not attempting to breed the fish, and isn't going to move her to another environment to lay the eggs. This was just the result of fish happier with their new environment, I think.