a crayfish can have up to 100 babies.
This depends on the species and size of the crayfish, but a few hundred per spawn is not uncommon for a mature female
no once their born they leave them
All female crayfish have eggs inside them. However, she must be mature before they can be used. The female does need a male crayfish in order to have babies.
If the mom crayfish is dead, you should remove her from the tank. Leaving her in the tank can cause bacteria to grow, making the babies sick.
100
crayfish have six antennae
Crayfish have a total of 5 swimmerets
The crayfish could be a primary consumer but it matters where it stands in that particular food web.
EVERYWHERE
It could have up to 8.
As much as you want
yes as long as you're ok with the idea that they might have babies.