14 C
Byron Shire
September 26, 2022

Flooding the cause of fish kills in Ballina and Tweed

Latest News

Unions meet with Norco over staff stand down

With flood-ravaged Norco in Lismore under scrutiny the Australian Manufacturing Workers’ Union, the Australasian Meat Industry Employees Union, and the Electrical Trades Union met with management on Thursday to discuss the company’s plans for its Lismore ice cream factory.

Other News

Locals push to keep Bangalow Club as ‘member-owned’

With the Bangalow Bowlo board considering an amalgamation with large entertainment corporation Norths, a group of Bangalow locals are presenting their vision for their club, which they say will ‘preserve a valuable member-owned asset for the people of Bangalow to enjoy for many years to come’.

Mandy Nolan’s Soapbox: Being Ready

I used to love the sound of rain. Now, like many others, it frightens me. It reminds me that...

Locals on top at Byron Bay’s BJJ Open

Local teams blitzed the Brazilian Jiu Jitsu Spring Australian Open held at the Cavanbah Centre over the weekend. The...

Storylines – Working with mob

Many are asking ‘who do I talk to?’ if I want to work with mob? Taking the time to yarn, engage and build relationships is key.

U/12s win NSW country rugby championships

The Far North Coast U/12s rugby team won the NSW junior country championships earlier this month in Coffs Harbour. It’s...

Sue Higginson introduces bill to ban fossil fuel ads

Greens NSW Upper House MP Sue Higginson has today given notice of a bill set to ban fossil fuel advertising in New South Wales.

Many thousands of juvenile fish and prawns have been killed in Cudgera Creek. Photo supplied.

Significant fish kills in both the Ballina and Tweed areas have come about because of the recent flooding say council reps.

In the Tweed, a ‘blackwater’ event has killed thousands of juvenile fish and prawns in the Cudgera Creek Estuary at Hastings Point.

Tweed Council has confirmed that the cause of the fish kill is a total absence of dissolved oxygen within the waters of the creek.

Waterways Program Leader Tom Alletson says this is called a blackwater event. ‘The floodplain of Cudgera Creek, like that of Cudgen (Kingscliff) and Mooball (Pottsville) creeks, has been inundated by stagnant floodwaters for more than a week,’ said Mr Alletson. ‘Beneath this shallow water, thousands of tonnes of vegetation is decaying and consuming oxygen.
Mr Alletson says as the de-oxygenated water drains off the floodplain and into the creeks, it displaces all the good quality water and fish cannot breathe.

The weekend’s hot weather has exacerbated the loss of oxygen.

A fish from North Creek in Ballina. Photo supplied.

The fish kill in Cudgera Creek has been extensive, resulting in the loss of many thousands of fish of different species, in particular smaller animals.

‘It’s possible that larger fish have moved out of the creek into the ocean, but we have lost vast numbers of small prawns and the juvenile stages of many important species.

North Creek Ballina

Down at North Creek in Ballina, Cr Keith Williams says there are dead fish everywhere along the high tide line. ‘We can expect more elsewhere in the Richmond,’ he said.

Cr Williams says that in the 2008 fish kill, North Creek was habitable and provided safe haven for many fish. ‘It doesn’t look like that’s going to happen this time.’

Cr Williams says that undoubtedly the flooding rains after a long dry period have pushed a lot of organic matter into the creeks and rivers. This provides the food for algal blooms that strip oxygen from the water and leads to the mass suffocation of fish.

‘In this instance, it looks like this is from the release of Monosulfidic Black Ooze (MBO) from the rural drainage network in the acid sulfate soil areas to the North (behind Lennox Head).

‘Also the Ballina Nature Reserve has been a major source of poor quality water for many years with very little action by NPWS to remediate old drainage infrastructure in the reserve to allow greater saltwater flushing of the estuarine swamp habitat.’

Dead fish in North Creek in Ballina. Photo supplied.

On the Tweed, Tom Alletson says it’s another big loss for our environment.

‘There are still large areas of the floodplain inundated, in the catchments of Cudgera, Mooball and Cudgen creeks.

‘While it is likely that we have seen the worst of it at Hastings Point, there is a significant risk that a similar event will play out at Kingscliff and Pottsville.

Council will work with NSW Department of Fisheries to investigate and document this event and its cause.


Support The Echo

Keeping the community together and the community voice loud and clear is what The Echo is about. More than ever we need your help to keep this voice alive and thriving in the community.

Like all businesses we are struggling to keep food on the table of all our local and hard working journalists, artists, sales, delivery and drudges who keep the news coming out to you both in the newspaper and online. If you can spare a few dollars a week – or maybe more – we would appreciate all the support you are able to give to keep the voice of independent, local journalism alive.

6 COMMENTS

  1. Am I alone in marvelling at the complete absence of any mention of the horrific levels of pesticides,fungicides , herbicides and poisonous fertilisers flushed out of local plantations…. and the well documented toxic loads from suburbs and industrial areas ? While the “Monosulfidic Black Ooze (MBO) from the rural drainage network in the acid sulfate soil areas” is mentioned ,no explanation that these areas have been created by drainage systems negligently draining acid-sulphate wetlands for private profit, and now constantly dumping thousands of tons of sulphuric acid into local estuaries.
    But hey ! it must be that terrible fresh water ,organic matter, Nature Reserves and that pesky NPWS.
    You Know it’s True. G”)

  2. Why is it so hard to believe that the decomposition of organic matter via microbes is responsible?
    It’s basic biology and chemistry. Anyone with a fish-pond has seen similar decay-associated de-oxygenation.
    There’s enough evidence of the consequences of farms and fertilizers for people to digest without further muddying of the waters with such false attribution of blame in one of the rare instances that farming practices are not the driving cause of a particular ecological degradation.

    Wild accusations without evidence will only turn more people away from respecting the science and institutions urging us to act on environmental issues.

  3. Not surprising where you see such a lack of vegetation diversity along many creeks. The government could be helping landowners change this.

  4. Wild Bird Life is affected by de-oxygenated water.

    For example the Botulism Toxin may enter a birds central nervous system causing paralysis in wings, legs, and neck.

    Birds may drown because they can not lift their heads’ up out of the water.

    Call a Local Wildlife Group for advice – or – to report a sick or injured seabird / water bird.

  5. What about ALL of the toxic fire retardants this heavy rainfall has washed OFF the land, OUT of the bushfire zones, and INTO the waterways, creeks, rivers, dams, and sea!?!?

LEAVE A REPLY

Please enter your comment!
Please enter your name here

GG, Bob Carr, and Morrison

Back page note (7 September) from Bob Carr that the Governor-General (GG) got $18m from Morrison at the same time as the secret signing...

Mangroves keep carbon in the soil for 5,000 years

Marine forests are great long-term carbon sinks. In fact, according to new research on a Mexican mangrove forest, they can keep carbon out of the atmosphere for millennia.

West Byron flooding

All east coast communities are now daily regularly warned by the ABC radio/TV, by the Bureau of Meteorology, to prepare for flooding. The flooding...

Odd row of lights

Just following up the letter from Sarah Smith in the August 31 issue. It was a Starlink satellite train. My webcam captured the scene. Michael...