Fish Killed Algal bloom, Ascot Waters, Swan River
MORE than 4000 fish killed by an algal bloom have been collected from Ascot Waters marina over the weekend and more are likely to surface.
Thousands of sluggish and dead fish, predominantly black bream, surfaced around Ascot Waters marina in
the Swan River late last week, victims of a notorious microalgae.
It comes just weeks after the same species of algae was linked to over 2500 fish deaths over a 13km stretch further up the river, between Bassendean and West Swan.
The Swan River Trust’s senior environmental officer Jeff Cosgrove said more dead fish were likely to float to the surface over coming days.
Dr Cosgrove said the unseasonally dry and sunny conditions in Perth this winter had created ideal conditions for the algae.
“Karlodinium veneficum is a naturally occurring algae but it is not usually seen to this extent this late in the year,” he said.
Elevated levels of the potentially toxic microalgae Karlodinium veneficum have been detected by the Swan River Trust officers in recent weeks.
The dead fish are predominantly black bream, but have also included some herring, mullet, grunter, flathead, trumpeter, goby and at least one mulloway.
Despite an unpleasant smell and discolouration of waters to orange and brown in the worst affected areas, the microalgae is not a direct risk human health.
However, the Department of Health advises people and pets to avoid swimming and fishing in affected areas.
Anyone noticing dead or sluggish fish in the river should report them to the Trust by calling (08) 9278 0900, or after hours on 0419 192 845.
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