Originally Posted By: Bill Cody
It takes lots of crayfish per acre to control FA that is abundant enough that it obviously needs controlled. Density of adults and juveniles (YOY) IMO would need to be at least 5000/ac. One crayfish can only eat a small amount of algae per day.


I'm surprised that is all the craws it would take. That's like 1 craw every 8 to 9 square feet. I might have this wrong. Is 5000 what it would take to control the water shallow enough in a 1 acre to support FA growth; maybe a third acre? That would bring the number down to 1 craw every 2 or 3 square feet. Sounds like craws will not provide much control unless you have great cover for them. Unfortunately, for folks like me, in states where Tilapia apparently live year round, even under the ice, I know of no other biological control of FA. Anybody else know of one?

Last edited by Bill D.; 05/14/16 09:00 PM.
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