Otters and fish loss

[Fish30114]

I do about 75% of my fishing in a couple of really great golf course ponds. About 10 months ago, fresh water otters showed up in the bigger of the two ponds--it's about 45-50 acres, and the second is probably 2000 yards away, is 10 acres or so, and otters showed up in it about 90-120 days ago.

There is no question that the larger fish in the smaller pond have been decitmated. There literally are no larger --2 lbs or bigger left anymore, and it used to be hard NOT to catch several fish over 5 lbs in a session, and 10-12 fish north of 10 lbs were caught there last year.

The larger lake is still holding large fish, but there is no question that there are fewer of them, and the big fish for the year is nearly 3lbs below the large fish from last year--and that's excluding one super fish, that was such an anomally, that we don't even figure it as the max fish--it was 13 lbs 9 ozs, and is the second fish over 13 lbs that was ever caught in the lake.

I am curious to feedback info from folks as to how to eliminate the otters.
What others have experienced in terms of otter decimating fish populations, and tactics that have been succesful in getting rid of the otters--killing them is definitely the preference of the powers that be BTW.

These devils are mostly nocturnal, spilling out into the lakes from their hidey holes a few minutes before or after last light.

Thanks for any feedback.