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Marine Parks as a Fisheries Management Tool (Read 120618 times)
pjb05
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Re: Marine Parks as a Fisheries Management Tool
Reply #210 - Dec 7th, 2008 at 5:20pm
 
Quote:
Yes if you build the stock up the catch rates will be higher for a while, but at the end of the day the more fish you take out the less biomass will be in the ocean.


Not necessarily. With better management tools such as marine parks, it is possible to have consistent higher catchs and higher stocks. That's how they work.

Magical thinking. You could have got a job on Wall Street (up until recently) with that sort of thinking.

Quote:
No the Park wasn't yet established and funnily enough a time machine wasn't available to go into the future.


Why is it that every study done after a marine parks is put in paints it in a very postivie light, yet we always get these 'the sky is going to fall' reports before they go in? [/quote]

If were talking about socio-economic effects what about the 300 m acutually paid out adjacent to the GBR and the 40% drop in angling participartion in the Cairns area. Why do you persistantly ignore these results?
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freediver
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Re: Marine Parks as a Fisheries Management Tool
Reply #211 - Dec 7th, 2008 at 6:06pm
 
Can you justify your assumption that it is impossible to improve on current catch rates sustainably?

Quote:
Why do you persistantly ignore these results?


They were compensation for a number of changes, not just marine parks. The marine parks on the GBR were not designed to improve fishing.
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pjb05
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Re: Marine Parks as a Fisheries Management Tool
Reply #212 - Dec 7th, 2008 at 6:42pm
 
Can you justify your assumption that it is impossible to improve on current catch rates sustainably?

It's well known that the population dynamics under fishing pressure are such that maximum sutainable yield is reached when 30 to 40% of the unfished population is left. You won't find many fisheries biologists who think that this best achieved using marine parks as the main management tool. Grounds in a NTZ are lost to fishermen and the so called spillover will not come close to making up for that. You can get spill in too. Fish enter a NTZ and don't come out!

Marine parks are usually justified on conservation/ preservation grounds.  

It can be argued it's preferable to fish somewhat lighter than the MSY as a buffer to overfishing, more resilent ecosystems, higher CPU, better recreational fishing etc.  


Quote:
Why do you persistantly ignore these results?


They were compensation for a number of changes, not just marine parks. The marine parks on the GBR were not designed to improve fishing. [/quote]


I think you will find that the money was set aside purely for the fall- out from the GBRMP. I don't think any Australian marine park is designed to improve fishing. In the case of the GBR the WWF campaigned strongly for it. The Howard government needed Democrat votes to pass the GST and part of the deal was that the Park was to be established. For the other parks - none have been instigated by any state fisheries department. They have come about as a result of political wheeling and dealing of weak Labor governments anxious to retain office through Green Party preferences. Even staements in the acts of parliament and from ministers state the parks are to 'preserve biodiversity' and not manage fisheries.
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freediver
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Re: Marine Parks as a Fisheries Management Tool
Reply #213 - Dec 7th, 2008 at 6:56pm
 
Quote:
It's well known that the population dynamics under fishing pressure are such that maximum sutainable yield is reached when 30 to 40% of the unfished population is left.


It is also well known that this can be affected by management methods.

Quote:
You won't find many fisheries biologists who think that this best achieved using marine parks as the main management tool.


Except of course for the ones that signed the cosnensus statement.

It seems to me that you are assuming that traditional methods are the best way to go, merely because they are the traditional methods. You are confusing the current understanding of population dynamics under those management regimes with endoresement of those regimes as giving the best results.

Quote:
Grounds in a NTZ are lost to fishermen and the so called spillover will not come close to making up for that.


You keep insisting this, but the evidence clearly contradicts you. You have no justification for what is no more than an assumption.
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pjb05
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Re: Marine Parks as a Fisheries Management Tool
Reply #214 - Dec 7th, 2008 at 7:24pm
 
It's well known that the population dynamics under fishing pressure are such that maximum sutainable yield is reached when 30 to 40% of the unfished population is left. [/quote]

It is also well known that this can be affected by management methods.

What the MSY or how you achieve it?

Quote:
You won't find many fisheries biologists who think that this best achieved using marine parks as the main management tool.


Except of course for the ones that signed the cosnensus statement.

I don't think many (if any) of them were fisheries biologists.

It seems to me that you are assuming that traditional methods are the best way to go, merely because they are the traditional methods. You are confusing the current understanding of population dynamics under those management regimes with endoresement of those regimes as giving the best results.

There demonstrated in practice. The marine park approach is the theoretical one especially if you after maximum or optimal sustainable yield. The socio-economic drawbacks are very apparent. So why should we rush down this path. You keep avoiding my question as to where is the research regarding NSW marine parks after 15 years?

Quote:
Grounds in a NTZ are lost to fishermen and the so called spillover will not come close to making up for that.


You keep insisting this, but the evidence clearly contradicts you. You have no justification for what is no more than an assumption. [/quote]

If you forget the political manifestos there are plenty of reviews/ papers which back my claim rather than contradict it. I have put them up here in the past.
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Re: Marine Parks as a Fisheries Management Tool
Reply #215 - Dec 7th, 2008 at 7:38pm
 
Quote:
What the MSY or how you achieve it?


Both. Technically the MSY isn't actually the maximum if you aren't employing the best management tools, but there is no theoretical limit to this, plus it adds unreasonable complexity to the concept, so management regime is usually taken as a fixed parameter in considering MSY.

Quote:
I don't think many (if any) of them were fisheries biologists.


They all work in relevant fields. This was not a call for anyone with letters after their name to sign a political statement.

Quote:
The marine park approach is the theoretical one especially if you after maximum or optimal sustainable yield.


That was based on practical experience, not theory. The theory did not predict improved yields. It was observed.

Quote:
The socio-economic drawbacks are very apparent.


You mean putting up with people who whinge about it constantly? The same thing happens every time a new fisheries management tool is introduced. Almost identical complaints were made when TACS, minimum sizes, bag limits etc were introduced. All management tools have socio economic costs and those from marine parks are not any different. It is the fact that it is new that makes people complain, not anything fundamentally different.

Quote:
So why should we rush down this path.


No-one is rushing, but the evidence justifies their implimentation.

Quote:
If you forget the political manifestos


If we did that none of the so-called 'evidence' you rpesented would make it in. If you had real evidence you wouldn't bother with crap like what you posted from Richard Tilzey, which is purely political and doesn't even make sense when you think about it.

It is not a political manifesto. It is a statement of scientific consensus.
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tallowood
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Re: Marine Parks as a Fisheries Management Tool
Reply #216 - Dec 8th, 2008 at 5:34am
 
pjb05 wrote on Dec 7th, 2008 at 12:36pm:
tallowood wrote on Dec 7th, 2008 at 9:17am:
pjb05 wrote on Dec 7th, 2008 at 7:21am:
tallowood wrote on Dec 6th, 2008 at 10:11pm:
IMHO, people who can not catch legal size fish on single hook within half hour in an area they claim is not overfished should not claim any authority in the matter.

I think your in the wrong sport Tallowood, if you want that sort of instant gratification. Even the first settlers struggled to catch fish at times. Were we overfished in 1770?

They didn't claim an authority in the matter.

What's that got to do with it? It was your (unrealisic) measure of overfishing.
PS, with your use of silly semantics I supect you are FD posting under a different name.



You are paranoid. Guys who can't catch fish on line in waters that they claimed to be not overfished are wankers and to call them authorities is plain stupid.


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pjb05
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Re: Marine Parks as a Fisheries Management Tool
Reply #217 - Dec 8th, 2008 at 3:15pm
 
[quote author=tallowood link=1192441509/210#216
You are paranoid. Guys who can't catch fish on line in waters that they claimed to be not overfished are wankers and to call them authorities is plain stupid.


[/quote]

No, there called poor fishermen. Even our most heavily populated city fishes well. It is not difficult at all to catch a feed in Sydney with some basic level of fishing skill.
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Re: Marine Parks as a Fisheries Management Tool
Reply #218 - Dec 8th, 2008 at 3:21pm
 
Does anyone have some CPUE figures for Sydney compared to other areas? I don't think anything less would make PJ face the reality.
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pjb05
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Re: Marine Parks as a Fisheries Management Tool
Reply #219 - Dec 8th, 2008 at 3:34pm
 
freediver wrote on Dec 7th, 2008 at 7:38pm:
[quote]What the MSY or how you achieve it?


Both. Technically the MSY isn't actually the maximum if you aren't employing the best management tools, but there is no theoretical limit to this, plus it adds unreasonable complexity to the concept, so management regime is usually taken as a fixed parameter in considering MSY.

Of cousre there is a limit - the ability of fish to reproduce.

Quote:
I don't think many (if any) of them were fisheries biologists.


They all work in relevant fields. This was not a call for anyone with letters after their name to sign a political statement.

You will find that most of them were ecologists. They tend to have a different view of the World which is not consistent with sustainable use of natural resources. Many of them also recieve generous financial support from the ant-fishing Pew Charitable Trust.

Quote:
The marine park approach is the theoretical one especially if you after maximum or optimal sustainable yield.


That was based on practical experience, not theory. The theory did not predict improved yields. It was observed.

You really struggle with this subject FD? Plently of reserve studies show no such thing. Plenty more lack sufficient rigor to prove any fishery wide benifits. Results quoted like know-nothings such as Clover Moore are from heavily fished/ depleted fisheries and cannot be applied to our waters.

Quote:
The socio-economic drawbacks are very apparent.


You mean putting up with people who whinge about it constantly? The same thing happens every time a new fisheries management tool is introduced. Almost identical complaints were made when TACS, minimum sizes, bag limits etc were introduced. All management tools have socio economic costs and those from marine parks are not any different. It is the fact that it is new that makes people complain, not anything fundamentally different.

Yes people do tend to whinge about little inconveniences like going broke. Bear in mind these were sustainable fisheries which were shut down on the GBR. Also on the contrary minimum sizes and bags limits are well recieved by anglers and compliance is high. Many anglers in fact have their own voluntary limits which are far tighter than those proscribed. These limits do not significantly degrade the marine experience - locking people out does (why are you so obtuse)?

Also you haven't offered any evidence that any of the 300m was allocated to non GBRPMA matters. Please don't ignore this request for something to back this claim.


Quote:
So why should we rush down this path.


No-one is rushing, but the evidence justifies their implimentation.

With 33% of the World's marine parks no other country has gone in for them the way we have - I'd call that rushing.

Quote:
If you forget the political manifestos


If we did that none of the so-called 'evidence' you rpesented would make it in. If you had real evidence you wouldn't bother with crap like what you posted from Richard Tilzey, which is purely political and doesn't even make sense when you think about it.

It was a letter to a newspaper editor. I have also put up peer reviewed papers which have resulted in similar vitriol and personal attacks from you. In fact the further you are shown to be out of you depth the more you turn up the vitriol.



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pjb05
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Re: Marine Parks as a Fisheries Management Tool
Reply #220 - Dec 8th, 2008 at 3:38pm
 
freediver wrote on Dec 8th, 2008 at 3:21pm:
Does anyone have some CPUE figures for Sydney compared to other areas? I don't think anything less would make PJ face the reality.


There aren't any CPU figures by location for recreational fishing. Not than I need them to know its not hard to catch a fish in my home waters.

PS, there is no reason for activist not to demand a marine park. If an area (eg the GBR) is largely pristine an un-impacted they want a park because it is pristine and un-impacted. If an area is heavily populated and impacted they want a park because it is heavily populated and impacted!
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Re: Marine Parks as a Fisheries Management Tool
Reply #221 - Dec 8th, 2008 at 4:27pm
 
Quote:
You really struggle with this subject FD? Plently of reserve studies show no such thing. Plenty more lack sufficient rigor to prove any fishery wide benifits.


The vast majority show that reserves are beneficial. Hence the scientific consensus. It is based on the weight of evidence, not cherry picking results as the anti-MP lobby does. It is not a conspiracy funded by an 'anti-fishing' organistaion. That lie was just made up because the anti-MP lobby couldn't come up with a rational response. They had to explain away their inept arguments by pretending everyone was out to get them.

Quote:
I have also put up peer reviewed papers which have resulted in similar vitriol and personal attacks from you. In fact the further you are shown to be out of you depth the more you turn up the vitriol.


I also pointed out the obvious logical errors and the silly assumptions they made. You seem to ignore that bit. I guess it doesn't fit in with the 'they're all out to get us' conspiracy theory.
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Re: Marine Parks as a Fisheries Management Tool
Reply #222 - Dec 8th, 2008 at 6:40pm
 
Quote:
You really struggle with this subject FD? Plently of reserve studies show no such thing. Plenty more lack sufficient rigor to prove any fishery wide benifits.


The vast majority show that reserves are beneficial. Hence the scientific consensus. It is based on the weight of evidence, not cherry picking results as the anti-MP lobby does. It is not a conspiracy funded by an 'anti-fishing' organistaion. That lie was just made up because the anti-MP lobby couldn't come up with a rational response. They had to explain away their inept arguments by pretending everyone was out to get them.

Most lack rigor. The post office method doesn't work in high school and it doesn't work here. It is not a lie that half of the poeple who composed the consensus statement are funded by Pew. PS define 'benifical'. An increase in fish nos inside a reserve is not all you are claiming, ie fishery wide benifits of higher yield and at the same time a buffer against overfishing and you are claiming this irrespective of the current management regime and fishing pressure. 

Quote:
I have also put up peer reviewed papers which have resulted in similar vitriol and personal attacks from you. In fact the further you are shown to be out of you depth the more you turn up the vitriol.


I also pointed out the obvious logical errors and the silly assumptions they made. You seem to ignore that bit. I guess it doesn't fit in with the 'they're all out to get us' conspiracy theory. [/quote]

I think I established that was greedy reductionism on your part.
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Re: Marine Parks as a Fisheries Management Tool
Reply #223 - Dec 8th, 2008 at 6:55pm
 
He's a reference to the fall out from the GBRMPA. Now FD I will ask you again - where is your evidence that not all the compensation was realated to the park?


Second Reading Speech - Great Barrier Reef Marine Park and other Legislation Amendment Bill 2008

Senator BOSWELL (Queensland) (12.32 pm)—I did speak for about two minutes on the Great Barrier Reef Marine Park and Other Legislation Amendment Bill 2008 on the last sitting day. I want to recap what I said about this particular bill. Some time ago, we were asked to pass a bill that would allow for 70 zones to be designated as representative areas. These were called the RAP zones and they were to allow for biodiversity. That bill caused a fair amount of debate and during that time GBRMPA came to the parliament and asked senators and members to pass the legislation because they wanted 25 per cent of the reef for their representative area zones.

They visited my office and at that stage I suggested that there was enough reef out there for the representative area zones and they did not have to put them in areas where people fished either commercially or as amateurs. I was told, ‘Yes, that’s a very good idea, Senator Boswell, we’ll certainly take note of that.’ Of course, when the maps came out anything other than that had happened. We found fishing areas that were used for brood prawns, commercial fishing and amateur fishing were all excluded and put in the green zones. It was a terrible bill to have passed.

GBRMPA asked for 25 per cent and ended up taking about 33 per cent. The consequence was that as a government we had to pay out $255 million to compensate fishermen, net makers, outboard motor suppliers, fishing tackle suppliers and fishing processors. When GBRMPA came to the government they said, ‘There’ll be a cost to this piece of legislation. It will be between $1 million and $2.5 million.’ After paying out $255 million—and still people are not completely happy—we found out the cost of this legislation. Apart from the huge cost—the huge human cost of people going bankrupt, losing their businesses, homes and marriages—we also found that a number of people, I think about 324, were caught fishing in a green zone and received criminal convictions. These were people who went out in their little tinnies with 10 horsepower motors without GPSs and found they had fished in a green zone. They did not understand it; they did not have the knowledge about where the green zones were and they received a huge fine, I think, of around $2,000. As if that were not bad enough, those people picked up a criminal conviction for taking their grandsons out in a tinnie and ending up in a green zone because they did not have a GPS or did not know how to use one or did not have maps. One would have thought that a warning would be sufficient and a fine but, no, these people were given criminal convictions. That has an impact on them when they want to go overseas and cannot get a visa, or get some insurance or take out a bank loan; they have a criminal record and all the stigma that that carries. That was totally unfair. It was not what the previous government intended.

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Re: Marine Parks as a Fisheries Management Tool
Reply #224 - Dec 8th, 2008 at 7:19pm
 
Quote:
It is not a lie that half of the poeple who composed the consensus statement are funded by Pew.


So even if we accept this absurd argument, that still leaves half that aren;t funded by Pew, which points towards Pew funding not actually affecting their conclusions. It's like saying that if scientists are government funded, they will automatically parrot government policy. It simply ignores the reality of practising science.

Quote:
An increase in fish nos inside a reserve is not all you are claiming, ie fishery wide benifits of higher yield and at the same time a buffer against overfishing and you are claiming this irrespective of the current management regime and fishing pressure.


Yes it is irrespective of the current management regime. You can't recreate the benefit by trying to tweak alternative management tools. Obviously the benefit declines with low fishing pressure, but doesn't disappear. In any case if you are fishing virgin waters then you aren;t going to have trouble catching fish even if you are excluded from 20% of the waters. However there is no such thing as virgin waters any more anyway. In every place where marine aprks have been implimented, other limits on fishing pressure were needed because the fishing pressure reached a level that would undermine the fishery. Now obviously you could always increase minimum sizes, or decrease TAC's, until  you met some arbitrary standard for not 'needing' marine parks. But the point is that they are beneficial, not that you need them. The necessity only arises when politics prevents traditional tools from reacting quickly enough to ensure sustainability, not because those tools are incapable of protecting stocks. You can manage a fishery without marine parks, just not very effectively, and you will pay for it in the form of lwoer yields or increased risk of stock collapse. When people demand 'prrof' that marine aprks are 'needed' they are just demonstrating that they don't understand the issues.

Quote:
He's a reference to the fall out from the GBRMPA. Now FD I will ask you again - where is your evidence that not all the compensation was realated to the park?


The generous payments were politically motivated. They were handouts. Furthermore the NTZs were combined with significant reductions in TAC so as to actually reduce catches. If they reduce the TAC, then the commercial catch is going to decline no matter what else happens.
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