No Electric fence as this is a historical landmark pond. Also a duck pond for elderly and retired residents. Zapping old folks and shorting out thier pacemakers would be bad for business. I'll just scale back to some marginal plants and fish too small for otters to bother with. Gambusia and fhm. I think my 1500 bg and goldfish are otter food. Hopefully not my full groen turtles, but I wish I had never put them in either.