Help my fish have gone down to the bottom of the pond

They probably have food on the bottom of the pond,my fish do that when its cold.........

there will be lots of life in the mud, insect larvae and blood worm type critters which they will prefer. so they are all ok so dont worry.

Thanks for your help, just dont understand why they stay there even when its sunny. They used to sunbathe on the top.I thought the heron had got them until I started to empty the pond to clean it and found them all at the bottom.

if you have had a heron around that will be why. they are hiding from it.