Thames Water’s Walthamstow Reservoirs fishery will remain closed until mid-June.
A number of carp had to be removed from four of the six coarse reservoirs at the end of May, with the east London site closed to anglers as a precautionary measure against further fish losses.
Initial reports back from CEFAS (Centre for Environment, Fisheries and Aquaculture Science) found Carp Edema Virus (CEV) present in samples of dead fish. Thames Water is expecting further test results from the Environment Agency next week before making a final decision on when to reopen.
Will Barnard, Thames Water fisheries manager, said: “We’re very grateful for the support from our anglers and their patience at this challenging time, and are doing everything we can to get things back to normal as quickly as possible.
“Our job now is to fully understand the impact on our stocks and work hard towards getting Reservoir 1 back to its best. While we have lost fish elsewhere on site, these are not in the numbers that would affect the quality of fishing.”
CEV, commonly known in the ornamental pet carp trade as Koi sleepy disease, is still being researched throughout Europe and CEFAS will carry out additional tests on the Walthamstow fish in order to aid further research.
Will added: “As a safety measure, we’d like to make sure that the EA findings marry up with CEFAS before we announce an opening day in mid-June.”