Fish experts are concerned that stocks of our native species are declining in Cumbria's famous lakes - so the Environment Agency is trying a novel approach to protect them.
Protective shelters have been installed in Bassenthwaite Lake to help fish evade predators.
Patrol officers will use a remote controlled boat to help them check the shelters.
Matthew Taylor went to find out more.
The refuges protect growing fish from predators and will help the fish stocks in the area to increase.
It is the first time equipment like this has been used in the north of England.
The Environment Agency is revisiting a Cumbrian lake where hedgehog shaped refuges were installed last year to help protect fish stocks.
Bassenthwaite is the first English lake to use the spiky constructions which provide shelter and a safe haven from predators.
A remote control boat will help monitor how well they are working.