Yabbies and Shrimp

Hi all,
Just wanted to get clarification on a couple of thing regarding yabbie
and shrimp collection in the Murray River.
From what I understand from the NSW Fisheries web site is that Yabbie
traps are basically banned East of the Newell Highway and anywhere on
the Murray upstream of the Echuca road bridge (and a couple of other
spots), and Yabbie traps are allowed east of the Newell Highway as
long as the have the entry restriction on them.
Have I read this right?
There is no mention on restrictions on collection of fresh water
shrimp and I assume ( not always a good idea) that there are none.

Also what qualifys as a Yabby and a Shrimp trap, I have found
references to shrimp traps but nothing on dimensions such as net size,
entry size, and overall trap size. Does anyone have any info on where
to get traps or how to make them?

Thanks
Dave