How do you know if your koi carp is pregnant?

Answer:
i have a tank full of fish at home and many of them are carp fish. Lately we've seen a female carp fish with an enormous stomach and its so heavy its weighing her down.
Because its weighing her down shes scraping her self at the bottom of the tank. i personally dont think that this is just because shes fat i know its because shes pregnant but how and when is it going to come out?
First answer by ID1523944207. Last edit by ID1523944207. Question popularity: 1 [recommend question].