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Feral fish found in Byford by the Scarp Lake to be eradicated

Environmental Issue.

pearl cichlid fish

The Shire of Serpentine Jarrahdale wishes to advise residents that a non-native and feral fish species discovered in the Byford by the Scarp Lake will be eradicated from April 8 to April 12.

A recent survey was undertaken at the Byford by the Scarp Lake, located on Clondyke Drive, Byford. The survey identified that introduced fish species are within the lake and damaging the native fish and macroinvertebrate populations which degrade our streams and rivers. The species Pearl Cichlid is one of the fish identified which poses a significant threat to the local aquatic environment and downstream Peel Harvey Estuary.

The Shire of Serpentine Jarrahdale advises residents and lake users that placing fish within this lake creates a negative impact within the ecosystem and is not permitted. The feral fish that have been identified in this survey have been introduced.

As the fish need to be removed before the winter season arrives, the Shire of Serpentine Jarrahdale have liaised with the Department of Primary Industries & Regional Development for the removal. The Department of Primary Industries & Regional Development’s Aquatic Biosecurity section will apply a chemical called Rotene, which degrades in light.

Approximately 48 hours after placement of Rotene, if the lake requires a neutralising agent, than a liquid called Potassium Permanganate will be applied. Please note, that the agent may cause a colour change in the lake for a short period of time. Upon completion of the works, all dead fish will be removed from the lake using non-disruptive equipment (hand-nets).

A survey will be undertaken in Spring to check the condition of the lake and to ensure that no feral fish have survived. Once the lake has been cleared, officers can than restock the lake with native fish.

Prior to the placement of the chemical, explanatory notices will be placed around the lake notifying the public. In addition, 24 hours prior to the placement of the chemical, a bunting fence will be erected, to ensure area is clear. The feral fish control is expected to commence on the 8 April 2019.

All chemicals and agents used in this process will not affect the surroundings soils, groundwater, nearby residents, pets and will have no long-term impact on the birds and native wildlife. The chemicals used for the elimination of feral fish is under an Australian Pesticide and Veterinary Medicines Authority (APVMA) permit.

If you require any further information on this matter, do not hesitate to contact Mark Angeloni on 9526 1104 or info@sjshire.wa.gov.au.