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Sexing my corydoras.


Georgiapeach88
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I have 4 corydoras in my 36 gallon and 3 in my five. And I can’t for the life of me. Figure out what they are. One in my 36 I’m pretty positive is female. But it’s just so hard to tell. Not necessarily wanting to breed but would like to know if I have out numbered female. As I got them all at same time.  I have to get better pic of my other corys that are with my betta. 578C8B86-CD5E-4A41-AE74-D89820710464.jpeg.4dddb52c81f4821f7fbd9a3b5dd027d6.jpegFemale I believe above as she’s the biggest. 3C08526E-2EB7-4760-B5D9-CE316F78474F.jpeg.19438921d0e6673fbb58516e6aadb8cf.jpegI think are both maleA766A809-5E90-4DD5-B889-B835C785D1A6.jpeg.bcb100cd91d8f896cb3b489931e38995.jpegalso think male. 
Okay what do we think folks. I got them all at petco at roughly an inch long. Around May 20th 2021

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I assume these are all albino Corydoras Aeneus (Bronze Corys). The males are decidedly skinnier than females. I'll say . . . they can take some time to grow to sexual maturity. We had ours for a year or more before they showed any spawning behavior.

Here's a breeding journal if you're interested. Lots of trial-and-error. One thing they like is flow! and to get them ready, heavy feedings and extra water changes with cooler water than your tank temp. It simulates rain.

 

Edited by Fish Folk
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With corys the size generally tells you which sex they are. Males are thinner and generally smaller. Females are bulkier. (Though don't call them that unless you want to get tail slapped. Perhaps calling them more Rubenesque would be less offensive to the female corys.) In my experience, it's not a subtle difference in mature fish. If you can't tell a difference, you've likely got corys that are all the same sex. It's typically not a subtle difference in size and bulk. A top down look may help you distinguish males from females better also. Once you know what to look for, it becomes pretty clear which are males and which are females.

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Gotcha. Well out of the 7 I think I have one beautiful female. Their might be one more female that’s with my betta out of the 7. But they are a smidge smaller I think. So harder to tell. Even though I bough them all same day at same store….

So how the heck to I even out numbers. I don’t want her to be harassed being the last fish in the sea so to speak 😂 

when corys are sold so young at my LFS? 

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When it comes to corys, more males can be better. The females are tough and more males typically means more sperm floating around which should lead to more fertile eggs. I've had one female mating with three males at the same time with no trouble. No torn fins, no injuries, just a small kind of bubble of spawning catfish. It's typically advised to have two males for every female, so more males is better than not enough males.

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Some pic of the ones out of my other tank. Decided since they can’t eat as much from my betta patrolling above them all the time pushing them away from food. That I would acclimate them to my 36 gallon tank. That waY they can grow appropriately. As they are quite a bit smaller than the others I got the same day as them. I think this is 1-2 female with male I think. 

C9B49319-3ABF-4144-8EC4-A2A4E6CE03E0.jpeg

ED7DFD4A-D553-4B8C-B629-380D132574E3.jpeg

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They are all so happy they have schooled together but never like this. Yay. I think I have two females in for boys out of the seven I have. The one I know is female sticks to herself and the other female was one of the sm ones I moved into the big tank today she’s also sucking to herself. My son Jm wanted a pic too 

F62FFC30-7DA6-4F82-A1FD-3C0D72F245D0.jpeg

5F76E69C-111E-4A99-9682-8D0580F60DAB.jpeg

088BAE80-EE45-4560-BDD1-83CA9567D844.jpeg

432EC897-5F79-415E-AA3D-F8A9611615F3.jpeg

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