Guppy breeding advice
Hi, I have a 30 gallon freshwater tank filled with primarily guppies and a few neon tetras. I recieved the tank with adult guppies already in it and lots of little guppy fry. My fry are starting to mature and i don't want to encourage incest, but I have nowhere to put the almost adult fry. So my question is what are some of the negative effects that incest could cause for the population of my tank and is really that big of an issue to worry about?
I believe over generations of in-breeding physical deformities, like a bent spine, can occur. Also, the fish just die early. This is what I've heard anyway.
"Incest" isn't the right term. Fish aren't creatures who have any understanding of family. Inbreeding or line breeding are the right terms, and this is a method often used by breeders to get certain traits to reliably appear or be enhanced, etc. You can also get some really freaky throwbacks, but regardless, this isn't something you need to feel icky about.
If you allow too much inbreeding to occur things such as weaker fish, bent spines in fish, shorter lifespan, and a variety of other possible deformities, it usually isn't too big of a problem as long as you try and keep them apart and add a completely unrelated fish's genes into the mix for a generation or two. (this helps strengthen the lines)
Inbreeding (with my stock) is usually controlled by not buying all of my fish from one stockist, plus I never keep any of my fry, these are split up and given to various stockists/ customers.
If I want to buy , say 6 fish, they will be bought from 3 stockists,,,2 from each.
You can never stamp out inbreeding, but with a little bit of forward planning you can achieve a healthy stock in your tank.
As a footnote, every now and then, try and buy some wild caught stock to help to reduce inbreeding.
I've heard many things about the incest in fish , however most are not true.
Your biggest problem with guppies interbreeding (keep in mind that most of the weak or deformed ones will get eaten), is that their are no new genes entering the population, so if two deformed ones breed you risk running a line of deformed guppies.
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