Just my 2 cents worth but I would not add crayfish. They dug holes along my drain pipe in the clay dam, fought them for 2 years and many leaks. Had to remove the pipe, install a large rubber sheet with the drain through the middle, then repack dam. It looks like my neighbor is going to have to completely drain his pond remove and replace the dam, plus install a heavy liner to keep the critters from boring holrs through his again. Very distructive little things. They were already in the drainages that we built our ponds in.
The one thing that might help you is that I am sure your pond dam is thicker than either of ours, we are only holding back around 1/2 acre of water. If your problem continues, there is a dark blue dye on the market that is farm animal safe, cuts down on the amount of light that reaches the bottom of your pond reducing the growth.
There are also aquacides that are supposed to be fish and animal safe but they are expensive.
Another option is grass carp. In WV you need a permit from the state to purchase them, they are supposed to be sterile so they can't reproduce. Several friends have used them quite successfully.
Good luck and good fishin.
Gerald C

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