Larvicide Treatments Scheduled for West Bay Peninsula

The Mosquito Research and Control Unit (MRCU) advises that its Aircraft Section will carry out larvicide treatments along the West Bay peninsula on Friday, 17 April and Monday, 20 April.

Residents in these areas can expect to see a low flying aircraft making multiple passes over targeted wetlands as part of the operation.

Recent data from MRCU’s observation sites shows that seasonal tidal shifts have begun, creating favourable conditions for the Aedes taeniorhynchus, commonly known as the black salt marsh mosquito, to lay eggs in swamps and along dykes. As tides rise and reach these areas, the eggs are triggered to hatch. Larvicide treatments are timed to stay ahead of these cycles, with each application remaining effective for approximately six weeks, helping to keep mosquito numbers low and reduce large emergences.

Larviciding at this stage interrupts that process before adult mosquitoes emerge, helping to keep overall numbers at a practical level and reduce the impact on nearby communities.

The Aedes taeniorhynchus is one of the most aggressive mosquito species in the Cayman Islands and can travel several miles in search of a blood meal. This species does not transmit diseases to humans, but it can transmit heartworm to dogs and cats.

In support of National Heartworm Awareness Month, MRCU and the Department of Agriculture Animal Protection & Enforcement Unit (APEU) encourage residents to ensure their pets are protected with appropriate heartworm prevention medication.

This work forms part of the Cayman Islands Government’s broader priorities to protect public health, support environmental management, and enhance the quality of life for all residents.

MRCU will continue to monitor conditions closely and carry out targeted operations as needed to manage mosquito populations across the Islands. Residents can report mosquito activity to mrcu@gov.ky.

MRCU teams remain active across the islands and will continue working to keep mosquito populations as low as practical.

To learn more, visit MRCU social media platforms.