We inherited a pond when we moved house. It had a small fence around it (mid-thigh height) and some frames with netting over them that sat over the pond.
The frames are made from copper plumbing pipes, and the mesh is just plastic netting with perhaps 5mm sq. holes.
We got rid of the fencing, but kept the mesh.
Last yr my nephew fell off his bike and landed on the netting. Luckily we were watching him & had been telling him repeatedly to stop riding so close to the pond, which he of course took as a challenge to ride as close as possible. He was clipping the brick edge with his inside pedal repeatedly, but on this occasion it stopped him dead & he tumbled off.
He ended up spread eagle on the mesh (like Tom Cruise dangling from that rope in Mission Impossible). It supported his weight fine (he’s an average size 5yr old).
I was quite impressed with how strong it was. Funnily enough, neither he nor his brother went anywhere near it for the rest of the weekend.