Shrimp reproduction question

[pixl8r]

I was asked this question by another, via email, and I could not find an answer to it in the forum, or online.

Apparently he had Red Claw shrimp that would breed, but all of the offspring would turn out to be male.

I have never heard of this with true shrimp. I know that some of the lower types of shrimp will switch to producing mostly male when they feel that their environment degrades (cold, not enough food...). Have any of you encountered this, if so how can it be rectified?

[bochr]

Maybe the tank is too small, and the offspring kills each other and he ends up with males.