On Sat, 2 Jun 2018 10:01:07 +0100
Nightjar wrote:

On 02/06/2018 09:15, Tim Lamb wrote:

I'd be a bit concerned about the lack of light on the pond?
Weldmesh?

That or a plastic mesh is the more usual solution. Suspended just
below the surface, it can be virtually invisible but still prevent
drowning

That will provide protection for fish from predatory birds but won't
stop drowning - it may even make it more likely if someone gets
entangled.