Why are my shrimps all male?

[lucas_1957]

Hi guys, i realised that almost all the shrimps in my tank are male except for one female Any idea what is happening? I dont specially cull away the female shrimps, so why did this happen?

[cheetf]

Arse luck?

[lucas_1957]

But there are around 40 males to 1 female Its like too extreme already

[Koji™]

Get more female then.

[cheetf]

Where did you buy them from?

[lucas_1957]

Those are yellow shrimps and i have been keeping them for about a year. I bought them from c328 long time ago and also supplemented with some more from green chapter. I will get more female, but i would also like to know the cause of the problem. Is it due to inbreeding perhaps?

[discuz]

Originally Posted by lucas_1957

But there are around 40 males to 1 female Its like too extreme already

Hi,

Realised i have the same issue with yellow shrimp (with bar on the back) ... i have about 30pcs and only 1 female.


mk

[cheetf]

Bro, you only discovered this after one year?

[gryphon]

Tell us more about your setup and water change

[lucas_1957]

Originally Posted by cheetf

Pick individually if you can. That way you can be more certain of females.

Yes, heading to colourful later

Originally Posted by binniez

Hmmm.. This is rare.. Usually when you buy shrimps in packs, its usually the males that are rare. Meaning out of a pack of say 20 pcs you should get about 2-3 pcs of male if you are lucky. I ever bought a pack of fire reds with all 20 pcs being females! I think you should just buy more females in and see how it goes.

Yes will do so

Originally Posted by eviltrain

Hehe in another forum, someone ( not ts ) said that its impossible to selective breeding out till left one of the sex.

Back to topic.

Now you can go gc and select those intensive yellow female to seletive breeding again. Its very difficult to get intensive colour male actually.

Not really, most of the males in my tank have quite good colour

Originally Posted by ultrakiasu

I read from some overseas forums, temperature can determine the gender of the shrimplets at embryo stage.

And certain gender would hatch earlier than the other, thus early harvest at the hatchery generally have the batch of the same gender.

My 2 cents worth...

Thats interesting, can pm me the link?

Originally Posted by cheetf

Bro, you only discovered this after one year?

I guess i did not realise it at first until i saw that i had less and less berried females, then i realised. I was hoping some of the young shrimplets would be females, but it doesnt seem so, so i got worried only now.

Originally Posted by gryphon

Tell us more about your setup and water change

pH:7.5
Temp: Max 28, between 26-28
Water change: 10% once every 2 weeks
Filter: Sponge filter
Flora: java moss and hornwort