Is Inbreeding Bad?

[VidVid]

hey...im looking at breeding kribensis...i bought one breeding pair and they had about 25-30 babies...i placed the babies (2-4cm) in a 15 gallon right after placing a 4cm female which i had previously bought from the shop...I want to make another pair in the 15 by first selling off the other fish just leaving the single male she pairs off with...My question is, do kribensis or any other pairing fish pair off with their siblings??? I know im going to pair up a male with another female (from a different batch) but what if i didnt have that other female...What should i do if they pair up themselves and knowing little knowledge beforehand, allowed them to breed...Out of curiosity, is inbreeding bad for fish? What will the inbred offspring turn out to be? Thanks in advanced.
P.S. say my breeding pair (presently in the 37g) breeds and the newly formed pair (male offspring of the breeing pair in the 37 //and// a female from a different batch) in my 15 breeds as well...say if one male and female from each pair repectively breed, would that be classified as an inbred???

 

[Tolak]

Inbreeding is how you come up with many of the different color varieties of fish. Angels, guppys, platys, the list is almost endless. Taken to an extreme it can be bad, such as with some guppys. You can develop weak strains without outbreeding once in a while.

In between is line breeding, where you breed less closely related fish, such as uncle to neice, or grandfather to granddaughter. Outcrossing is where you breed two fish that are products of line breeding, but two unrelated lines.

 

[Dorkhedeos]

i probably is bad, or else the thai betta breeders wouldnt worry about it right?

 

[Tolak]

There is more inbreeding in aquatics than you could imagine. Done correctly it isn't a problem. You can generally inbreed for several generations if you start with unrelated fish. Unrelated is usually considered 10 generations removed. Once you start to see a low fertility rate, or fish with defects you have taken it a couple of generations too far.

That is where line breeding comes in. Lets say you are trying to breed red guppys. You get two lines going, inbreeding each line to itself with fish chosen for red expression. You do this for a few generations with each line, then you choose some of your best reds from each of the two unrelated lines & breed them. This is commonly done, and is the correct way of breeding for certain traits.

 

[annka5]

Sibling-to-sibling breeding does increase the risk of the offspring having various deformities /ailments with a genetic cause; however, that risk in the first place isn't actually that high, at least not for many many types of animals, fish, etc.

 

[VidVid]

Inbreeding is how you come up with many of the different color varieties of fish. Angels, guppys, platys, the list is almost endless. Taken to an extreme it can be bad, such as with some guppys. You can develop weak strains without outbreeding once in a while.

In between is line breeding, where you breed less closely related fish, such as uncle to neice, or grandfather to granddaughter. Outcrossing is where you breed two fish that are products of line breeding, but two unrelated lines.

Yep...i already got a breeding pair of kribensis which had offsprings around 4cm...I took the liberty of not inbreeding so before i actually got the batch of offsprings, i had previously had a female krib...Now i want her to pair and breed with one of the males...

You said inbreeding is how you come up with many of the different colour varieties? By inbreeding say kribs (sibling to sibling), can colur variants include say yellow kribs or even albinos???

 

[annka5]

Selective breeding can only bring out genes that are already there- so unless you had kribs with a lot of natural of yellow colouration, then you wouldn't get a yellow krib through breeding just two normal kribs.
You would need to find ones with the traits you were looking for, and from there breed just as Tolak describes.