We rent as have a tiny garden 1/3 of which is a pond (120cm long, 50cm wide with various depths). This was the pride and joy of the deceased father of our landlord. When we moved in all the wiring to the pond was declared unsafe and ripped out leaving a pond full of goldfish with no pump but lots of lillies. This was 2 yes ago at first fish died (I kicked up a fuss but it was clear the landlords didn't care and we couldn't afford to do anything) but they seemed to find their own equilibrium. The pond is now teaming with fish. The problem is I now have a baby, soon to be toddler and the pond is not safe. Even if we found a way to cover it it's in a sort of rockery with is sharp and dangerous. It is concrete without any sort of liner.
So my question is: how do I go about filling it in? Will people collect the fish if I put them up for free on gum tree or similar? Could I release them into a pond somewhere or would that damage the Eco system?
This seems a silly post now I read it back but I don't want to harm/kill the fish and I have no idea where to start!