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 Brine may impact on cuttlefish reproduction 

Brine may impact on cuttlefish reproduction

5/08/2008 12:54:00 PM
University of Adelaide student, Jacqueline Dupavillon, recently researched the effect of brine discharge on cuttlefish eggs as part of her honours thesis.

Ms Dupavillon found that with the increase in brine concentration, the chance of egg survival decreased and at 50 parts per thousand and above there was total mortality of eggs.

According to Ms Dupavillon heavy metals and toxic chemicals can also be detrimental but “salinity is one of the most important physio-chemical factors to which they are exposed.”

BHP Billiton are currently in the advanced stages of their Environmental Impact Statement for the expansion of Olympic Dam.

Part of the expansion includes a desalination plant, proposed for the Point Lowly Peninsula.

A spokesperson for BHP said the EPA wants brine levels to be within 10 per cent of discharge levels within 100 metres of the outfall.

“This can be achieved because water in the region of Point Lowly is extremely active and helps ensure the rapid dispersion of the return water,” the spokesperson said.

“The dispersion rates have been determined by modelling which takes into account the broad movement of water through the entire gulf and also more detailed modelling of water in the vicinity of Point Lowly.”

According to BHP the desalination plant’s operations will be ‘dwarfed’ by the natural cycles of the Gulf.

“There is an annual cycle where salinties build during summer and fall during winter,” said the spokesperson.

“The plant’s impacts will be well within the natural daily variations of the Gulf, those impacts will be scarcely measurable.”

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Comments


Date: Newest first | Oldest first
The battle of David and Goliath - all over again! Will BHP Billiton take this information on board , giving consideration in the drafting of the EIS, which is due out shortly?
Posted by ozziesquid on 5/08/2008 2:32:29 PM
It's ok for B.H.P.to get experts to make this report but no-one knows what the real affects will have we are not cuttlefish we cannot speak for ourselves so we expect to be protected.The gulf is already salty + and why not find some deeper waters along the coast where inhabitants will be less endangered. the gulf is too shallow the currents are changable the rip changes and is not deep water.The South Ausralian govt sold us down the river just look at the stuff up there they said at the time it would have minimum effect on the murray 20yrs later disaster and this will be the same think long term and not in $$$$ B.H.P.have billions of $$$encourage them to spend it piping the brine of the coast either between Cowsled landing and Cowel or Ceduna.PtLowly also has the only recreational beach and 3 tribes of native australian share in heritage dreamtime stories and sacred stones and sand hill within 100k remember B.H.P.say this is a small development ha!this is just the start our state won't just be the driest but the most contaminated Stop and listen Mr Rann not in our backyard what about yours
Posted by gilbert on 7/08/2008 10:43:48 PM
You sold us down the River Mr Rann don't throw us out to sea WE SAY NO TO DEVELOPMENT IN POINT LOWLY
Posted by gilbert on 7/08/2008 10:47:34 PM
Cuttlefish: In reply to the cuttlefish story, by Jade Walker, so many people don’t fully understand the implications of industry on the natural reserve of Point Lowly, the desalination plant’s effect would not so much suck up eggs etc, but would in time increase salinity of the whole area as explained in the comments related to the article Desalination fix 1/8/08: from the brine solution returning back to the bay after processing, as jaquline has said but this might not be as big a impact as shipping iron ore from the site or increased shipping. But recently receiving a state government brochure on the Point Lowly developments seems we have lost the battle. The council running around carrying out feasibility study’s on alternate areas, are wasting there time and the communities money as cowels landing is too shallow for cape ships loading and there are no rail or water infrastructure. And as mentioned in the lowly development brochure, the development is completed at no cost to the government. So all the ideals of having the whole lot relocated to cowels landing, is wishful thinking as the mining companies would not come at the extra cost of paying for the infrastructure. I would be betting to say the decision has been made to allow the 500 hectares of land and the subdivisions go ahead, at point lowly. The iron ore commodities site; the 80 million liter diesel storage facility; and gasoline refinery site, would be more of a threat for the cuttlefish in my mind from storm water run off from the iron ore storage or spillage which will turn the bay red. And heavens forbid if there is a diesel spill from the 80 million liter storage area, ok they may retain the spill, but ground seepage could not be controlled. Have a look a hummock hill how the vegetation doesn’t like iron ore dust, and what do you think is going to happen to point lowly area railing in ore loading it shipping etc etc. No I am afraid if the Point Lowly development goes ahead you can slowly kiss the area good buy.
Posted by Rob Flounders on 17/09/2008 6:03:56 AM

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