Posted: 14/01/2016 at 12:36
Over the 25+ yrs I've had a pond I've lost loads of fish to herons.
I've now got just 3 huge koi - the heron doesn't even try his luck any more with them.
To keep the buggers at bay here are some that have worked for me.
The water scarer does work, but also works on anyone walking up the garden too. But mine didn't last more than a year or so, and frequently leaked.
I planted a spikey low-growing conifer (some sort of juniper I think) all around the edge of the pond which now gives me about 3ft of spikey surface around the pond. The herons wont attempt to step onto it.
Use black fishing line attached to little stakes. One at about 9" above ground and the other about 12" with about 18" between them.
Or - get an air-gun
The ornamental heron won't work during the breeding season (now) - they're looking for mates. It can help at other times, but you'll need to keep moving it about every couple of days - they soon wise-up
I tried to upload a pic of my pond but for some reason I just get a blank box if I click on the 'add photo' icon.... I'll try later