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Avoiding inbreeding


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Say, for example, you have a pond of minnows or guppies etc - how do you avoid constant inbreeding (for example, guppies when their spines start to bend) - do you constantly reintroduce new fish or do you just let them keep at it? Is it unacceptable to sell them at a certain point (so many generations down, but no physical defects)?

Also, has anyone ever kept any killies at outdoor temps?

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I have kept killies in outside ponds in Christchurch but only over summer.

Ah yeah, I figured they wouldn't survive the winter temps :( I'm in Auckland but slightly rural. Considering breeding my American Flagfish outdoors but not sure how easy it is to find new lines to introduce.

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