I want to have a large multi-acre pond teeming with water lilies and wildlife but I worry the wildlife (especially crayfish) will just eat up the lilies. How do I prevent this? I've heard of people using chickenwire around the lilies, but I'm not sure I'd be able to afford enough wire for the whole pond and I don't like the idea of such intensive management of a pond meant to be "wild" and self-sustaining. Does the wire need to be permanent or can I get by with just using some in the early days? Are some lily cultivars prolific enough to withstand the pressure from wildlife?