I didn't expect the soft shell crayfish we stocked would multiply as fast as they do. If you have the right rocky shore line they will populate like crazy. We have about 12 feet in length changing in 4-5 feet of depth 4" medium crushed recycled concrete.

I am guessing it has to do with the high level of lime in the concrete as well as ample places to hide.

Cheers Don.
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7/8th of an acre, Perch only pond, Ontario, Canada.