We are the caretaker of 8400 km of rivers, creeks and over 200 wetlands across Melbourne. We are responsible for managing Seaford Wetlands, which naturally attracts large numbers of mosquitos. Though not all mosquitos in the area originate from this wetland. 

Listening and responding to the local community, we have implemented mosquito larvae monitoring and coordinate management actions to control mosquito outbreaks during the warmer months of the year.  

What's happening and when

​The wetlands are monitored monthly starting around August each year and larvacite briquettes are distributed in the wetlands if excessive larvae numbers are present. The briquettes mimic the mosquito juvenile hormone and disrupt the development of larvae and pupae in the water with minimal impact on other fauna. They act for up to 150 days.

This monitoring will continue during the warmer months until the seasonal conditions no longer favour mosquito development. Rain patterns make habitat more available with extra water in areas that haven't been wet in a few years now being inundated.

Activities include:

  • monitoring of adult mosquitos and larvae
  • adult mosquitos will be sent to the Department of Environment, Land, Water and Planning (DELWP) labs for identification and examination for arboviruses inspections will assess the effect of rains on mosquito larvae numbers
  • treatment and control of mosquito larvae if outbreak numbers are found

Previous activities

Month Activity
December 2017 Very high numbers of larvae were found in areas of the wetlands. Briquette treatment was applied to the areas identified to stop larvae developing into adults. Adult numbers were lower than in the previous month.
November 2017 High to very high numbers of larvae were found in two areas of the wetlands. Treatment will be conducted in these areas and re-sampling will take place in December. Some adults were found. 
October 2017 High numbers of larvae were found in the same places treated in August. Treatment lasts for 3mths so no treatment will take place this month. Re-sampling will take place in November and will be treated accordingly.  Some adults were found.
September 2017 A high number of larvae and low number of adults were found at the wetland. Briquette treatment was applied to the areas identified to stop to stop larvae developing into adults.
August 2017 A high number of larvae and low number of adults were found at the wetland. Briquette treatment was applied to the areas identified to stop larvae developing into adults.
March (early) 2017

Medium numbers of larvae found in similar areas to those detected in December.  Adult numbers have increased from February. Briquette treatment re-applied to these areas.

​January 2017

High numbers of adults found in some areas but low number of larvae in the wetland despite the new water areas available to habitat.  Continue to monitor larvae numbers

​December 2016

​​Monitoring results showed a small number of larvae found in new areas (the lowest results since October). Contractors went out to control the larvae with briquettes.

November 2016

​Following significant numbers of larvae found in the new pools of water after seasonal rainfall, larvacite briquettes were distributed to stop larvae developing into adults for at least four months through the summer period  

​October 2016

Following significant numbers of larvae found in the new pools of water after seasonal rainfall, larvacite briquettes were distributed to stop larvae developing into adults for at least four months through the summer period  

​September 2016

Low number of mosquito adults and larvae found at the   wetland. This indicated a low risk for mosquito outbreak.
​December 2015 ​Low number of mosquito adults and larvae found at the wetland. This indicated a low risk for mosquito outbreak.

​December 2014

​Low number of mosquito adults and larvae found at the wetland. This indicated a low risk for mosquito outbreak.

​November 2014

Low number of mosquito adults and larvae found at the wetland. This indicated a low risk for mosquito outbreak.

Why this project is important

Currently, Melbourne is free of dengue fever, chikungunya or yellow fever.  This would not be possible without the work of the DOH, DELWP and Melbourne Water. 

Monitoring is regularly conducted to make sure vector carriers like the African Yellow Fever mosquito (Aedes aegypti) that are present in most tropical/subtropical countries of the world do not end up in Melbourne.

What you can do at home

Mosquito numbers can be reduced by getting rid of stagnant water around the home or campsites. Mosquitoes will breed in any receptacle that can hold water including old tyres, unused fish ponds, unsealed water tanks and pot plant holders.

Householders should ensure that insect screens fitted to doors and windows are in good condition.

Residents are advised to wear long, loose-fitting clothing and use a suitable insect repellent containing picaridin or DEET as an active ingredient on exposed skin areas during the warmer months of the year.

For further information and advice:

Better health - beat the bite

​Your feedback

Contact us with any comments or queries:

-38.0972133, 145.1385355

Last updated:
18 December 2017