Save the Spencer Gulf

THE message is spreading like the microalgae Karenia mikimotoi — but how do we save the gulf? 

I asked the scientists directly. I have spoken at forums and heard their replies. 

There is no plan to eradicate the algae blooms; instead, they will monitor and watch them spread.

Aquaculture scientists could learn from how agricultural scientists manage pest invasions on land. When an invasive weed breaks out in a paddock, they eradicate it quickly before it spreads. They stopped rabbit plagues and can prevent locust outbreaks. 

Agricultural scientists also developed programs to predict when conditions favour outbreaks and have proven treatments, tilling practices and equipment to protect productive land.

When I question marine scientists, they say they are not interested in eradicating this existing threat. 

Aquaculture scientists have been caught out, presenting the sea as fragile and only understood by them.

Instead of finding solutions, they are using this outbreak to attract new research funding, expanding labs with more equipment and monitoring buoys. 

Global warming is the catchcry — but meanwhile, the multimillion-dollar food and tourism industries are at risk.

My suggestion is to use tugs, barges and boom sprayers on the front line where blooms are active. Modern sprayers can carry 7000 litres, with GPS to spot spray thick patches and reduce dosage elsewhere. 

Chlorine, in measured amounts, could shock and kill algae to 300mm depth, dissipating quickly below that level without harming fish or good algae.

Marine scientists have satellite imaging to pinpoint blooms. At 8km/h, one barge could cover large areas. 

Trials could start in parts of Gulf St Vincent where only Karenia mikimotoi survives near shore. Barges, boom sprays and experienced operators are available.

Please, try to save the Spencer Gulf.

Bruce McKenzie, Wallaroo