Here is the Reply I got back from Environment and Parks:
Sometimes, rules are in place in an effort to manage human behaviour. While Northern Crayfish are a species native to the Saskatchewan / Nelson river drainage and appear to be naturally extending their range upstream along the river system, it appears that human may also be moving them around. The motives for doing this are unclear, but may be related to a desire to establish more populations to create commercial harvest opportunities. The rules for capturing crayfish which prohibit the use of traps are designed to not promote unwanted relocations by only permitting legal capture methods which are relatively inefficient. Aside from prohibiting movement of live crayfish and only permitting inefficient capture techniques, there is no effort underway to control crayfish populations.
Thank you.
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