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Line Breeding Question
February 13, 2011
11:49 pm
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Malti
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As you may know I have got some Golden lyretail mollies and black platies, from someone. now he says they are pure/breed true - that is, their offspring should be all same colour as their parents etc

I think the general rule would be 3 consecutive generations right? and does the brood number count? or is there a least brood number which can be considered minimum?

sadly I don't have access to the source, so can't really vouch what they are

February 14, 2011
12:33 pm
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keith565
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i'm not sure i know of a hard and fast rule. i'm sure there are peeps out there who have. but i go for at least 3 generations. even then you get throw backs. not sure numbers matter.
be interesting to see what others think as i have a few colour morphs of endlers, many of whom will throw back to the wild form if not kept in check.

February 14, 2011
12:59 pm
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ricefish
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The idea of line breeding is to keep or fix a particular trait so it is up to the breeder to remove any fish that do not conform,if left to their own devices and just left to breed you will soon see fish reverting back to normal

February 14, 2011
6:51 pm
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Malti
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I had guppies reverting back to wild form, when mixed with endlers (genius me mixed up the fry).

think I found some platy fry...fingers crossed they're same colourwise...

another livebearer question...how long can females store sperm, and produce fry? I know that most fish do it, but I'm not certain on duration

February 14, 2011
7:50 pm
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keith565
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as far as i know, it depends on the species. female guppies/swords/platies etc can store sperm for up to a year, but it does degrade with time. however, i believe most goodeids and the like need to mate after each batch of fry.

February 15, 2011
3:08 pm
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Sonny Disposition
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I'm skeptical about the mollies. I worked with P. velifera for about ten years before giving up on them. I think the breeders have been hybridizing species for years to produce the numerous variations.

Even after I started with what looked pure P. velifera from the shops, after getting specimens that looked like their parents for a couple of generations or so, subsequent males would only reach half size, with short sails.

I know from Ross Sokoloff's book that what are sold as black mollies in stores are actually a hybrid species of P. latipinna and a species or two from the sphenops complex. I suspect that other mollie breeds are similar hybrids, and, probably, subject to unexpected variations in progeny, like my velifera were.

February 15, 2011
4:33 pm
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Malti
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you might be right bob...but beggars can't be choosers, and I got those atm...well I'll see what comes out

February 15, 2011
8:41 pm
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Matt
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QUOTE (Sonny Disposition @ Feb 15 2011, 03:51 PM) < {POST_SNAPBACK}>
I suspect that other mollie breeds are similar hybrids

Think this is the case for many ornamental varieties of Xiphophorus and Poecilia too?

Cake or death?
February 16, 2011
1:13 am
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Malti
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Most probably Matt, seeing as livebearers are much easier to breed and mix.

February 16, 2011
8:39 am
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keith565
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QUOTE (Matt @ Feb 15 2011, 08:24 PM) < {POST_SNAPBACK}>
Think this is the case for many ornamental varieties of Xiphophorus and Poecilia too?


i totally agree. that is why i always buy from a reputable breeder and always get collection data.

you are absolutely right Sonny about the mollies (and to be honest most livebearers) you see in the shops.

February 16, 2011
3:39 pm
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Sonny Disposition
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If I ever go back to the mollies, I'll collect some wild fish the next time I'm down in Florida. I don't know about the xiphophorus species, though. I've tried the variegatus a time or two, but didn't get many fry from them. I picked up some red velvet swords from a local fish club auction, and there are a few with white stomachs, and one pinkish-tan fish with a horizontal red stripe.

A friend of mine has been breeding red velvets in children's wading pools in his basement for years now, and tells me they breed true for him, so I think what you say about reputable breeders is good advice.

QUOTE (keith565 @ Feb 16 2011, 03:22 AM) < {POST_SNAPBACK}>
i totally agree. that is why i always buy from a reputable breeder and always get collection data.

you are absolutely right Sonny about the mollies (and to be honest most livebearers) you see in the shops.

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