What age/size does a baby betta have to be in order to sex?

Zarafia avatar
4 years ago #1
Zarafia
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I bought a tiny little "baby" betta yesterday. I was told he is a male, but right now he looks female, fin wise.
He is my only fish right now so I can't try and watch his behavior with another fish and he was so stressed out yesterday at the store I didn't bother setting him next to another fish to see how he would act.
Right now his body is just under three quarters of an inch. With tail he is still under an inch long.
I was told that he's around two and a half to three months old. I have no idea what fin type he is, but I'm assuming veiltail.
I really don't care what he ends up looking like or what sex he is. But I am curious.
Any help on this would be much appreciated.

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nexuslite avatar
4 years ago #2
nexuslite
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Females have a white dot on their underside. If you have a white fish this is unfortunate will make it harder to see. They are also wider and will end up with much more weight distributed towards the front.

I don't know if this happens with males but I have only seen females do it. When they get scared they will get vertical stripes. They will also sometimes get horizontal stripes on their gills.

At about 3 months you should be able to tell if it is male or female.

This is all just quick research I did to answer your question some of it may be slightly wrong and some of it is my experience with the 4 bettas I have which I bought with labeled genders.

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Zarafia avatar
4 years ago #3
Zarafia
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Thank you, Nexus.
I had forgotten about the little white bump (and can't remember what it's called now either lol) that the ladies have. Sam doesn't appear to have one.
He does still have those horizontal "stress stripes" but I'm much happier with his behavior today. Yesterday he hid and/or slept almost constantly in his new environment. But today and tonight he has been much more active and bold.
I crushed a betta pellet for him (his little mouth is too small to eat a whole pellet) and he went right after the bits and ate at least one.
He's a likeable little guy. I'm looking forward to watching him grow up .

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nexuslite avatar
4 years ago #4
nexuslite
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If I remember correctly it is called a vent but don't quote me on that. As I don't know any of the fish terms.

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johnarthur avatar
4 years ago #5
johnarthur
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If the tail is already longer than the fish, it's probably a male. Some pet shops don't even stock female bettas, because they are drab compared to males. The same is true of a few other species, even guppies. A single gender aquarium must be tough on the fish.

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nexuslite avatar
4 years ago #6
nexuslite
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@John some shops sell unsexed bettas. The petco here sells what they call betta babies. They don't imply any gender on the tub. Personally I think they all look female but that maybe because I don't know what the young males look like. I thought maybe it was a gimmick to offload females if you had already sexed them.

All 3 of my female bettas are absolutely beautiful. So I think drab may be the wrong word. They just lack the fins that the males have.

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Zarafia avatar
4 years ago #7
Zarafia
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Hi there John! I remember you , you remember me and my little betta LG?
Anyway, I think my first post was a little unclear, Sam (the new baby) is about three quarters of an inch long total, including the tail. "He" looks female right now.
And Nexus, Sam is one of those petco "baby bettas". They said that all the babies were supposed to be male, but I always take what they say with a grain of salt.
In any case I will have the opportunity to see correctly sexed baby bettas tomorrow. Would you believe it, an old friend of mine, who I met because she rescues cockatiels and I groom her birds for her, raises quality bettas! She just got a pair imported from Thailand and she has another pair that she says is from one of the top breeders in the IBC.
This whole time I've known a good local breeder but we never talked about fish LOL. I've only been in her bird rooms. But tomorrow I'm going to go pick up a 12 week old male, either a green or a blue. I've never even seen a green in real life.
Needless to say, I'm very excited .
If I can figure out how to post pics here I'll post some pics of her set up, her fish and my new baby.

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Zarafia avatar
4 years ago #8
Zarafia
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Oh, and the betta bug has bitten me pretty bad. After setting Sam up I got looking at all my old tanks and stuff and thought it would be more sensible to set up a few tanks, because betta food comes in such large containers LOL. I wouldn't want to have to throw stuff away because it went bad or anything. So yesterday morning I had to go out and get the two prettiest adult males I could find at petco and petsmart.
Then I got talking to this breeder and I simply must have one of her babies LOL.
I hope to learn from her when I go to her house tomorrow. I think she's been breeding on and off for twenty years or so.
I swear they need to put warning labels on bettas, "Warning, Highly Addictive" LOL.
Can we post pics with blogs? Cause I may have to write one about my trip to Jennifer's place tomorrow. With the high level of care that she gives her birds I'm sure that her bettas live the good life .

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johnarthur avatar
4 years ago #9
johnarthur
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Yes. You can post pictures with blog. I'm eager to read it. For some more exotic bettas, you may want to check out aquabid.com.

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Zarafia avatar
4 years ago #10
Zarafia
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Cool. I'm not very good with computers, but I'll try and figure out how to post any good pics I take.
I'm really excited about seeing her set up. And knowing Jennifer she probably has her own recipies for fish food.
And actually she sells some of her babies on Aquabid. I am not interested in showing, or breeding really, so I don't think that I would bother buying fish over the internet. I see beautiful enough bettas at the local petstores. I'm sure that Jennifer's bettas will be exotic enough for me .
I just love the fact that I've found a serious local breeder and she happens to already be a friend and a person who takes excellent care of her animals.

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4 years ago #11
GottaLuvDaFish
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Your betta probably isnt as old as you were told it was. It sounds to me, from your description, that he/she should only be around 7-8 weeks old, if that. If it is as old as you were told, it was poorly cared for as it was growing. It was probably raised in small quarters such as a 10 gallon and the water probably wasnt changed at all. Poor little fishy. Anyway, bettas can be reliably sexed at around 12 weeks of age because the males fins would have had plenty of time to have grown a little more than the females. Heres a great site to visit for your <email> Hope this helps, and good luck

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4 years ago #12
deann stoveken
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you can tell when the newborns are about two months if it is a female or male

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Luvn Bubbles avatar
4 years ago #13
Luvn Bubbles
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I am a betta breeder, and the baby fish they sell at petco and petsmart are all the size of a well-cared-for 9 week old. there is no age for the sexing of bettas, mostly because a good breeder can tell the sex sooner than other people can. Most females will show an egg spot, verticle bars when they are ready to breed, and horizontal stripes when they are stressed, but no matter, it is not an easy task. Males have long gill membranes that poke out from behind there gills, have longer and more pointed fins, and some show horizontal stress stripes. Young males may show a false egg spot, and some females may not have an egg spot. Males are also more aggressive, but some females are too. If your fish is as old as you were told, then it could blow a bubblenest, but females may also do this. Like I said, it is NOT in any way easy to sex young bettas! I would have your friend try to sex them if they are a betta breeder. NEVER LISTEN TO THE STORE EMPLOYEES! They get paid to tell you what they do, and a lot of times they will give you false information, because they just want to get paid and most have no idea what they are doing. You will want a specialist in this, so your friend might be more useful than you think!

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bettarocks avatar
4 years ago #14
bettarocks
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They have to be up to six months and will have a white dot under her fins and have vertical stripes meaning she is ready to breed. Also she will have a round belly shape

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Luvn Bubbles avatar
4 years ago #15
Luvn Bubbles
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here is a link to website that will tell you everything you need to <email>

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3 years ago #16
A
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My little sis got a baby betta at petco by the way we have 4bettas and she said she was 90%sure that he was a boy any suggestions on what he or she is

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2 years ago #17
Saleen Janzten
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Mine gets stripes too! Horrisontal and vertically!

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2 years ago #18
Saleen Janzten
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Mine gets stripes too! Horrisontal and vertically!

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2 years ago #19
Rohanmehra
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I have two male and female bettas the male is full in colour it is a vailtail betta but i dont know there ages as i bought yhem from the shop he male dint keep the bubble nest till know can any one say to me what i should do to make the male to keep him the bubble nest

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1 year ago #20
bettas!
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I have a small baby betta and I can't find any white dot underneath. My betta does have a big belly though...

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1 year ago #21
bettas!
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that looks just like my betta!

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1 year ago #22
Unknown
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It depends if it's a male it will have long fins and a female has short fins

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VincentsAquaria avatar
1 year ago #23
VincentsAquaria
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Unknown, please refrain from posting on old threads. You can tell by looking at the top right coner, on the left of the post number... Thank you

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9 months ago #24
Logesh
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It is a ovipositor

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