In August, the Inland Fisheries Service (IFS) received a report from a concerned angler regarding the possible presence of an algal bloom in Lake Sorell.

In consultation with the responsible water manager, the Department of Natural Resources and Environment Tasmania (NRE Tas), the IFS promptly collected water samples for laboratory analysis. Testing confirmed the presence of a minor blue-green algae (BGA) bloom within the lake.

Further laboratory testing undertaken this week by CSIRO (Hobart) has confirmed that the identified BGA species are non-toxic and do not pose a risk to recreational water users. Consequently, there is no requirement to restrict public access to Lake Sorell at this time.

Given the blue-green algae bloom is non-toxic you can catch and eat fish from lakes Sorell and Crescent. As a precaution, fish should be washed in clean water, gilled, gutted and all internal organs disposed of. Fish waste should not be fed to animals.

Do not drink the water and avoid direct contact with any areas of dense algae – we recommend washing and drying all clothing and equipment after your fishing trip.

Currently, the BGA bloom is confined to Lake Sorell and has not been detected in Lake Crescent. However, water has been flowing from Lake Sorell into Lake Crescent since June 2026, and this transfer is expected to continue to support water levels in Lake Crescent and downstream releases into the River Clyde, as per the Water Management Plans for the lakes and river.

NRE Tas, with support from the IFS, will continue to monitor the situation over the coming months through a combination of satellite imagery and regular water quality testing.  Updates will be provided as required.