Shark things out of hand in WA

Dawn Patrol said...



THIS^

And what if we "cull to push them to the brink of extinction" and there is no change. That solution is a typical modern day solution. Hmm it's cheap an easy, lets do it with no guarantee it'll work. What if in 5yrs time they are nearly extinct and then a Tiger shark takes a few people. Do we go cull them to near extinction as well?

southace said...

In South Oz they do cage diving with GWSharks,

Sounds harmless enough but the sharks get feed,Feed lots!
Not a easy meal as the food is on a string and when they go to eat it the string is pulled and the shark misses the food,
After several attempts the shark eventually wins.

But these sharks are smart they return every year to the same spot and play the same game.

What they eat is boxes and boxes of large cut up tuna.

When one changes eating habits what happens? They get bigger and need more eating right?

Most of these sharks that visit have been tagged and most of the readings are along the WA coast and some to the East coast.

This year has been a bumper season for the company,seeing up to 8 sharks per day.

WHAT HAPPENS WHEN WE EAT TOO MUCH FAST FOOD? WE GET FAT AND LOOK FOR THE NEXT FAST FOOD SHOP!

This has been going on for 20 years and increasing every year, in the old days they would take out just 1 or 2 tuna but now days its like 20 tuna cut into 60 big fat juicy steaks!

boofy said...



Or get the cage diving operations to tag them while they are there make it part of the experience it would be cool to do the cage dive and tag one while you are there

king of the point said...

What i carnt work out why the Fisheries find it so hard to tag Great Whites if they are trying to use and set up this shark alert system.

Obviously its a complete waste of time unless lots of Gws are tagged.

so

Instead of burrying dead washed up whales, tow them way out to sea anchor them down along the coast in groups of 3 ,4 or 5 off say so when the sharks arrive you can tag them.......

If they carnt do something like this then large sharks sighted within 1km of the mainstream metro beaches and coast should be removed.

Zachery said...



Are you serious ? (20 tuna cut into 60 big fat juicy steaks) that would cost them approx $10,000 a day just in feed !!

They use left over morts and frames and only let them get a taste, certainly not something i think we should be encouraging them to do so close to a coastal town which loves it's beaches and surfing

Condolances to the family of the deceased , RIP

southace said...




Actually a mort is a dead tuna just incase you didn't know and is usually a few days old and not fit for human consumption And very rarley they use frames that's only done after a yearlly harvest. And they operate 40 nm south of any town I wouldn't call it "so close to a coastal town"!

SP said...

Thought I'd repost this, from Coastalwatch. It was written this week and released today.


Shark attacks are every bit as traumatic as road accidents, but we're nowhere near as accustomed to them. Young people in particular are fatalistic about road trauma, which is why they drive fast and send text messages and do dozens of other foolish things behind the wheel. But no-one is blas? about the prospect of being ripped to pieces by a wild animal. It's highly emotive territory, and even cold hard statistics do little to cut through the dread.

The Australian shark attack file is a database covering the 700-odd shark attacks in Australian waters since 1791. It's maintained by Taronga Zoo in the interests of providing objective data for research. The ASAF's John West, who curates all that information, estimates that there are 100,000,000 beach visits each year in Australia, along 35,000 kms of coast.

Yet shark attack fatalities tick along at a steady rate of around one per year, despite our population and visitor numbers increasing all the time. According to the ASAF, 28% of attacks in Australian waters, a little over one in four, are fatal. And that ratio of deaths to attacks is falling, as it is all around the world, most likely due to better medical care. Considering the sheer number of dangling legs along our coast at any given time, it is reasonable to call the fatal attacks freak occurrences.

Breaking the numbers down a little further, in the last twenty years, there have been twenty-five fatalities, which averages out to around 1.25 per year. In the last fifty years, there have been forty-six fatalities, averaging less than one (0.92) per year. Therefore, there is substance to the idea that attacks are on the rise - it's just that it's a statistically tiny increase. The same thing can be demonstrated when looking at non-fatal attacks: from an average of 6.5 incidents per year in 1990-2000, these are now occurring at a rate of 15 incidents per year over the past decade. But the explosion in participation in watersports over this period dwarfs the increase in attacks.

Surfers are by far the most heavily represented group among victims: they are attacked at nearly three times the rate for swimmers, and five times the rate for divers. According to research work done by John West, there has been "a 310% increase in attacks on surfers since 1999. There have also been substantial increases in the attacks on swimmers, SCUBA divers and sailboarders."

Perversely, we tend to look for anomalies which will make the statistics feel unsafe. We search for patterns to give gravity to terms like "shark infested" and "man-eater". If attacks happen close together, whether in time or physical location, there's talk of how far one shark can move in a day, as though an individual animal has gone rogue and taken victims at multiple beaches like a serial killer.

Fear has the upper hand over mathematics again: this time due to a remarkable cluster of attacks in W.A. There's been six attacks in the last 12 months, five of them fatal, in the 300km stretch between Lancelin and Busselton. Of those, five were within 200km and nine months of each other. Five were outside the "cricket season" months when attacks are usually concentrated, and in fact the last couple have been deep within winter. What does it all mean?

Kent Stannard of the research funding body Whitetag makes the point that sequences of attacks are not unprecedented. "S.A. had a similar run of fatalities back in the early 2000s," he says. "Just because shark numbers appear to be high in one area doesn't mean they are high elsewhere. The Neptune Islands have a shark index which goes in peaks and troughs - some years high shark activity, some years low. Dangerous Reef in the Spencer Gulf was consistently the site of most white shark activity back in the 70s and the 80s.We went out with the Fox group late last year dropped off acoustic receivers and returned in April this year to find only one tagged shark had been in the area over that period."

Would a mathematician tell you these peaks and troughs are within the bounds of normal statistical variation? Or does the WA cluster give credibility to concerns that great whites are becoming more numerous in southern WA, or that something about their diet or habitat is changing, to bring them inshore? Seal and whale numbers along our coast are known to have increased over the last decade, but conversely, the impact of our fisheries is greater by the year.

On a recent shark tagging trip with Barry Bruce, the CSIRO's chief researcher of great whites, I remember raising these questions and being told that no-one knows how many great whites are out there. There is simply no way of counting a solitary wild animal in an unwatchable environment. So we protect them on the precautionary principle that if it's likely we are pushing an animal towards extinction through the combined effect of our actions, we should assume the need for protection. As he told me this, Barry Bruce and I were sitting on a rented fishing trawler, filling the water with pungent burley in a known nursery area. We'd been at it for six hours, and hadn't seen a fin.

But in the wake of Ben Linden's tragic death last weekend, there's talk of lifting the ban on commercial and recreational great white fishing, and specific orders have been given by the state fisheries minister to exterminate all four to five metre sharks in the area. It is unclear from the relevant press release exactly what constitutes "the area", and whether officers should measure sharks - to establish guilt by body length - before shooting them. The scientific consensus is that such killings are politically effective but practically useless. Even if every large shark off Perth is caught, killed and dissected until human remains are found, the exercise has all the scientific rigour of a witch hunt. There is no research basis for the idea that sharks involved in one attack will go on to attack other humans. On the contrary, it is believed that in the majority of cases sharks immediately leave the area and don't return.

According to Kent Stannard, "Australian salmon are in abundance inshore along the southern coasts at this time of year and migratory species - including white sharks - are working their way up the east and west coasts of Australia. White sharks when migrating are in transit mode, and behave differently than at seal colonies. They tend to be opportunistic feeders. This, mixed with more surfers and ocean users, suggests chances of interaction are heightened."

Tagging is beginning to provide the data that might ease our minds. Movement patterns, residency times, site fidelity and behaviour can now be measured and plotted. But it's expensive, time consuming work, and it's a lot less sexy than a mass killing. It matters, because the more tags are out there, the more accurate the data becomes. As long as good quality information is finding its way to the broader ocean user community, then it can be said tagging is potentially saving lives. Stannard gives the example of a 5m tagged white shark triggering the receivers off Perth beaches recently: the signal gave surf lifesavers time to activate their shark response plan. "This shark was tagged down near Albany," he says, "which also confirmed these animals are a migratory species moving up and down the WA coast at certain times of the year."

"CSIRO research has identified an eastern seaboard population of white sharks all stemming from and returning to the one region in eastern Bass Strait," he continues. "These sharks all share the same genetic code, and they track between Wilson's Prom and the Port Stephens region of NSW. All are considered juveniles - 1.2 - 2.8m, and 1-5 yrs of age. When they return to eastern Bass Strait, they don't go beyond Wilson's Prom. It's possible that's genetically hard-wired in them."

We're in the early stages of what might be achieved by tagging and genetic coding. The risk of shark attack could be dramatically lowered through scientific intervention. But in the meantime, an average of 87 people are drowning at Australian beaches every year. Just plain old drowning. These deaths are not as gruesome, but in many cases they're far more preventable. For the cost of a national shark cull, for the environmental damage it would do, how many sharks could we tag? How many kids could we teach to swim? How many more beaches could we patrol? This is the delicate dance of numbers, so easily skewed by fear.







Read more: http://www.coastalwatch.com/news/article.aspx?articleId=10652#ixzz211yTWUZf

jbshack said...




A good post. it is a little old and hasn't taken into account he last year or two but still a very valid point.

mineral1 said...



After hearing a woman ring talk back radio yesterday ranting on about this, indicating there needs to be an urgent investigation into such "known" practice, I am concerned that Darwin's theory hasn't kicked in with some of the local population.
What a bunch of disrespectable drop kicks in that rabble