How effective are tilapia at controlling duckweed?

For details, the pond is a 1/3 of an acre and at this time approximately 1/3 of the pond is now covered and getting worse by the day. No submerged aquatic vegetation, lots of emergent vegetation along the bank. There is some algal growth, but no major algal problems as this time. The pond currently only has forage fish in it, no predator fish of any kind.

Would the addition of tilapia control duckweed in this situation or is some other method needed?