rusty info sheet Iowa info about rusty crayfish:
Iowa Fact sheet about Rustys Iowa has rusty crayfish already, not sure about your area. I found it interesting in the IA article that it says that it is illegal to even put your boat in a body of water that has rusty crayfish in it already. That eliminates the big river systems in IA, all of the Mississippi river and from what it sounds like, more than half the bodies of water in IA.
Certainly you may not be interested in adding these kind on purpose if you have a good supply of 'native' crayfish. Do you have sufficient numbers that they stir up the water? What is your water clarity like? If you desire more crayfish creating habitat for them to survive predation is a win win both for your fish as a forage choice and also perhaps to prevent water from getting too much sunlight to grow weeds.
Don't throw in carp or goldfish... just trust me on that.
How about the tilapia idea is that allowed in IA?
Else it is back to chemicals, boat mounted harvesting or manual shore or wading based 'raking' of the algae.
It is back breaking work, more suited for changing the attitudes of obnoxious adolescents or productive work for prisoner crews who need to do good community service projects.
Removing algae dead or alive is better than killing with chemicals and letting it sink...
