Recent pike hauls in the lake have been underweight

Conservationists are concerned over reports that pikes caught in Bassenthwaite recently have been weighing in at less than 12 pounds.

Thriving pikes are usually a good indication of the "health" of the water, according to the Lake District National Park Authority (LDNPA).

It is urging anglers to log catches as part on the investigation.

Permit holders

Shirley Muir, of the Bassenthwaite Lake Restoration Programme, said: "Some of the most significant differences seem to have been among pike stocks.

"As pike are top of the fish food chain, they are a good indicator of the health of the lake and, if changes are taking place, it is essential we find out more.

"We want to know what's happening to our freshwater species - and why."

Letters have now gone out to the all the lakes angling season permit holders appealing for help.

Ms Muir added: "We want to work closely with our fishing fraternity and now have two angling representatives on the Bassenthwaite Forum."