I feel like we were all being groomed for this answer for some time now, recent media releases pointing towards 'natural events' now we are fed an algal bloom as a cause.
Water quality, Yep if I let the water quality drop in my tank I will have an algae attack. but that's due to crap water due to not doing the water changes.. Now IMO the sound if it is having algae problems then they should see nitrates in the water samples, nitrates are a sign that the water is not being flushed but pooling or holding in pockets in the sound. either way the sound is stuffed. I once tested the water as I was going to use it to do a water change in my marine tank, no way I would use it.
We need to put pressure on the Gov, reduce pollution and more openings on the lime stone dam to GI.
Makes sense . Just had a call from a mussel farmer.. Also makes sense it did start in small boats area( garden island) warmer water no flow in that area. Hence first fish dying there. The mussel farm has been responsible for many many years of water quality testing.( in sound) They have to . Mussels thrive on this microscopic algae. They have had letter from health and fisheries dept . All safe.( consumption wise). I don't know much about algae blooms but this one only attacks things with gills . And they have been checking for wrong algae poisons ect. I trust his opionion and has convinced me. No reason to lie. Especially when people's health could be affected. If it did start there in small boats area. Maybe they should think about modification to the causeway ( garden island side). Remove rocks and put small bridge there to allow flow into this dead zone. This would prevent algae thriving in area. And maybe stop another major bloom happening again. ???
In addition to toxin production, algae have also been implicated in fishkills by the following direct methods:
Mechanical damage to gills by algal spines, notably the serrated spines of Chaetoceros spp. (e.g. Yang and Albright 1992).
Irritation of gills resulting in over-production of mucilage within the gills leading to suffocation (WHOI 1995).
Physical blocking of the secondary lamellae of fish gills (Jones and Rhodes 1994).
Increased water viscosity due to the secretion of polysaccharides (e.g. Hallegraeff 1992).
The principal indirect effects arise from changes in the oxygen balance of the water column associated with the presence of the bloom during its growth phase (supersaturation with oxygen during the day and oxygen depletion during the night) and the decay of the algal cells when the bloom has crashed (oxygen depletion of parts of the water column and possibly the sediments).
Algae have been implicated in fishkills by the following indirect methods:
Asphyxiation caused by oxygen depletion (e.g. Brooker et al 1977). This can occur as a result of the oxygen demand generated by a senescent bloom, or at night due to extreme diurnal fluctuations in dissolved oxygen levels which may occur during algal blooms.
Gas bubble trauma from extreme oxygen supersaturation (Renfro 1963).
There is some probablity that this is the cause, although I haven't seen the facts. Blooms link to poor water quality and I would say that the Govenment needs to urgently address this issue.
But I am still concerned about the evidence of damage inflicted to kidneys and liver (having said that I have only seen reports of this in 1 fish).
The fact that witnesses saw damage to gills thus is plausible with your explanation above. The fish sort of get a "pulmonary oedema" equivalent in their gills due to irritant effect aswell as rapid diurnal O2 level variation.
This can make sense, and would kill many species without discrimination. But didnt some claim that some invertebrates like crabs etc was effected??? Dont quote me but I do recall reading about lots of crabs on a rockwall, and then not being there!!?
Someone finally backing up their thoughts and not making sweeping statements - good work Mick C!
Crasny1 - I agree about the other organ effects but as a science based worker (I believe your a MD?) you would have to agree that having n=1 is not a solid foundation to draw any conclusions from.
As there have been alot of reports from both public and the authorities that dying fish appear to be gasping for air, would a pulmonary oedema-like syndrome and potential asphyxiation by water O2 depletion not cause this observation?
And i dont want to upset anyone but im all for the canals to go in at point peron and wouldn't canals open at both sides allow flow of water to that area on the east side of the cause way.
Crowie, the design is not to channel through to the Shoalwater side. So by my reconning the Mangels bay marina will create a stagnet water body at he southern end. Considering the water quality in this part of the Sound is poor at the moment, what do you think the effect of the canals would add to the water quality?
Put it this way, if the marina goes ahead, we can expect more of these so called natural events.
To prove it is at rally. Take mussels from pylons (causeway bridge). Collect a few fish up from Sth end of sound. Invite health dept. fisheries. And government to have a barbie at beach on us. While they eat they can tell us cause of fish deaths . Would be nice gesture I think:):):):).
like the fish this farce stinks from the head down convenient excuse used by the government dept involved still will say the navy need the microscope put on them over this but it wont happen
Certainly not convinced yet, without any hard evidence.
If it was Algae the question would be where did this algae come from, maybe need better quarrentine of ships pumping out possible algae infected water from other countries.
I can see it is plausible but wouldn't think likely with a body of water that large to the open ocean.
Having worked in the quarantine industry with international ships. It is Federal requirement that any ballast water which may be discharged in Australian waters must be collected in open ocean. There must be a equivalent of 95% of tank holding must be open ocean water. This transferr of water must be recorded in the ship's log book and can also be checked via the ship's voyage/plotter course. This record is check prior to any ship being allowed to proceed with discharging ballast water. Yes we still get marine pests entering our water ways from overseas but the majority come from external foulling on ships and smaller crafts i.e. yachts.
in my many years working at east intercourse and parker point in dampier do you really believe those logs , i have been on line boats that have raw shit pumped on to them from the bulkys in the harbor and have been DE ballasting with the most foul smelling water i have ever smelt , the crews are not supposed to fish from the bulkys either when in harbor but many many line boat seaman have been smacked with a sinker and been hooked by a set gang hooks dropped down from a bulky
Raw sewerage is managed differently than ballast water. Since ballast water is held in tanks with no circulation or aeration it does become stagnant. How long ago was it that you were involved with international shipping. I was involved within the last 5 years with international shipping. The Quarantine requirements in Australian waters are the strictest in the world and if a vessel or company does not follow these regulations they are/will be banned from operating within Australian waters. Things have and do change Peter. I have seen this first hand. YES I DO BELIEVE THESE lOGS. a ship also needs to exchange ballast water in certain locations and can only does so at certain speeds, this can easily be check on the course charts which a captain will NEVER falsify. Random samples are also take when ships have taken up ballast at a high risk port.
As for raw shit being pumped directly onto a line boat your a bit close to a bulky that also goes for being hit by sinkers.
Through this debate I have tried to be objective, and inform Members about the possible mechanisms of fish kills from my personal experience in having to deal with these matters in a number of instances. Do I genuinely believe the explanation provided through the media, no I don't. It is possible, but so are a lot of other causes.
As Jason indicates, it is all about the evidence. The community has not been provided with the data, other than being told that Fisheries will release a report at some time in the future. The critical evidence to test their hypothesis is the algae concentration (organisms per millilitre) and dissolved oxygen levels (milligrams per millilitre) in the water at various locations at the time or very soon after, the fish were killed. This information must be compared to published (peer reviewed) data that showed the concentrations will, in all probability, kill fish.
Unfortunately, I believe the response by the agencies was too slow. Relevant data must be collected quickly, because as explained in my other post the reliability of evidence diminishes within a short time frame. I am convinced that we will never really know the "true" cause with an acceptable level of certainty, however the Fisheries report may prove me wrong.
it hasn't been anywhere near hot enough as yet for Algal blooms to be prevalent within the Swan river, let alone the Cockburn sound area. Also if people remember correctly we had numerous days of long hot summers with 37 + degrees being the norm for nearly 10 days or more, and there weren't algae problems in the sound then.
Unless I am missing something the Algal blooms are normally started from lack of water movement and increased water temperature. it has been blowing its tits off for weeks on end here in Perth and also am I not mistaken in the sound being full of salmon only 6-8 weeks ago, and Salmon live in normally colder water climates.
Government is using the algal bloom theory to at least give some form of excuse for the recent fish deaths, most likely to appease the public and to divert the news headlines for the time being.
Just a thought, would the algale bloom be a result of a warm November and low rain fall. Looks like the temperature on average was around 30 which I thought is a bit warmer than normal. The combination of warm weather, low rain fall the water/current direction and wind patterns may have trapped water in the Mangles bay area allowing for this to occur. Than when the larger tides or wind and current change large pockets of this water is than moving and therefore cousring the effect it has had on the fish poulation. Have seen the same effect at Coral bay during coral spawning when the currents and the prevailling wind does not allow the spawn to disperse out to the open/outside of the reef. ningaloo-atlas.org.au/sites/default/files/Anoxic%20impacts%20at%20Bill%E2%80%99s%20Bay%20during%202008.pdf
NOVEMBER
Temperatures Average Maximum: 26.3C Average Minimum: 14.2C Highest Maximum: 40.3C on 24/11/1913 and 11/11/2003 Highest Minimum: 25.1C on 24/11/1920 Lowest Maximum: 15.8C on 2/11/1919 Lowest Minimum: 5.0C on 18/11/2004 Highest Average Maximum: 29.6C in 2010 Highest Average Minimum: 16.9C in 1982 Lowest Average Maximum: 21.5C in 1971 Lowest Average Minimum: 11.9C in 1954
Rainfall Average Monthly: 22mm Highest Monthly: 73.2mm in 1984 Lowest Monthly: 0.0mm in 1891 Highest in 24 Hours: 39.1mm on 29/11/1956 Highest Raindays: 14 in 1939, 1950 and 1965
As we all know the whole way this has been handled is a joke/disgrace they may as well close Cockburn to fishing and hand it over to industry!! that may sound defeatist!!
But after sitting on quite a few meetings about Cockburn Sound water issues/Planning the result has always been to the detriment of the Sound!
Industry and its profits $$$ doesn't give a Shit about what's happening neither does the Navy!
I cant believe that the lack of Crabs and Prawns in Cockburn is related to water Temps it has all to do with salinity /Dissolved O2 as this became an issue after the desalination plant started.
To compound the Crab issue they let the Pros keep fishing until near collapse???
I also cant fathom the number of Pro licences still in place with the sound sitting on a precarious edge?
After fishing in the Sound for over 35years and 15years of research with the Snapper this Algae bloom is a crock of crap!
If Bi valves eat these little fish killing critters how come they haven't been picked up in the mussel testing?
and why weren't the Bi valves tested on the main tidal influence area under the causeway as this is the area where the killing continued as the tide went out???
Rather than grasping at an these "Likely" results they need to improve water quality.
roll on the mangles bay development , i am sure that will improve the water quality ( like Fuxx it will it will destroy what is left for our kids) bloody joke the whole situation
Causeway . No way is Sth end flushed enough. Needs more bridges. Can't blame industry for Sth end . Where industry is there is tones of life and nice sea grass???? Sth end algae . Slime and sea grass dying. Not saying industry helps it's about flushing. That's just my opionion. Not expert on matter. If mangles bay project goes ahead say bye bye.I can believe what I have been told. But I still would like them to eat food from coat hanger. Then I will 100 percent believe them. Under the jetty where I work thousands of bait every night . ???? Mullys and pinks???? Also crabs. Hmmm def not industry side
Although the government would have alterior motives I do believe the algal bloom. The symptoms the fish exhibit coincide with the cause.
I think some people don't realise the temperature being cited as a cause of fish deaths is about oxygen concentration in the water. my year 12 chemistry taught me that as temperature increases gas (oxygen) solubility decreases in water.
So at a time when oxygen levels were likely already low, an above average temperature allowed for oxygen solubility to decrease to dangerous levels. This combined with an algal bloom that interacts with gills and respiratory system of fishes means they have no chance of breathing, with impaired gills and dangerously low oxygen levels the fish are dead regardless.
Noxious
Posts: 504
Date Joined: 22/12/11
I don't buy it for one
I don't buy it for one second.
I feel like we were all being groomed for this answer for some time now, recent media releases pointing towards 'natural events' now we are fed an algal bloom as a cause.
Walfootrot
Posts: 1386
Date Joined: 23/07/12
What a lot of crap.
What a lot of crap.
More drum lines, kill the bloody sharks!
Noxious
Posts: 504
Date Joined: 22/12/11
I feel like I need to dust
I feel like I need to dust off my pitch fork and lantern.
rigpig
Posts: 507
Date Joined: 21/11/12
here is the report
http://www.watoday.com.au/wa-news/algae-behind-cockburn-sound-fish-death-mystery-authorities-20151208-gliiws.html
Blade
Posts: 5
Date Joined: 25/10/14
I call Bullshit!
I call Bullshit!
Noxious
Posts: 504
Date Joined: 22/12/11
If it smells like bullshit
If it smells like bullshit and looks like bullshit, it's usually bullshit!
Moking
Posts: 1252
Date Joined: 30/05/12
(No subject)
My Dad taught me how to Fish-Thanks Dad.(RIP)
Walfootrot
Posts: 1386
Date Joined: 23/07/12
Water quality, Yep if I let
Water quality, Yep if I let the water quality drop in my tank I will have an algae attack. but that's due to crap water due to not doing the water changes.. Now IMO the sound if it is having algae problems then they should see nitrates in the water samples, nitrates are a sign that the water is not being flushed but pooling or holding in pockets in the sound. either way the sound is stuffed. I once tested the water as I was going to use it to do a water change in my marine tank, no way I would use it.
We need to put pressure on the Gov, reduce pollution and more openings on the lime stone dam to GI.
More drum lines, kill the bloody sharks!
little johnny
Posts: 5345
Date Joined: 04/12/11
I believe it now
Makes sense . Just had a call from a mussel farmer.. Also makes sense it did start in small boats area( garden island) warmer water no flow in that area. Hence first fish dying there. The mussel farm has been responsible for many many years of water quality testing.( in sound) They have to . Mussels thrive on this microscopic algae. They have had letter from health and fisheries dept . All safe.( consumption wise). I don't know much about algae blooms but this one only attacks things with gills . And they have been checking for wrong algae poisons ect. I trust his opionion and has convinced me. No reason to lie. Especially when people's health could be affected. If it did start there in small boats area. Maybe they should think about modification to the causeway ( garden island side). Remove rocks and put small bridge there to allow flow into this dead zone. This would prevent algae thriving in area. And maybe stop another major bloom happening again. ???
Mick C
Posts: 605
Date Joined: 26/12/13
Information on Algae Cause of Fish Deaths
From the scientific literature.
In addition to toxin production, algae have also been implicated in fishkills by the following direct methods:
The principal indirect effects arise from changes in the oxygen balance of the water column associated with the presence of the bloom during its growth phase (supersaturation with oxygen during the day and oxygen depletion during the night) and the decay of the algal cells when the bloom has crashed (oxygen depletion of parts of the water column and possibly the sediments).
Algae have been implicated in fishkills by the following indirect methods:
There is some probablity that this is the cause, although I haven't seen the facts. Blooms link to poor water quality and I would say that the Govenment needs to urgently address this issue.
Ability is what you are capable of doing. Motivation determines what you do. Attitude determines how well you do it - LH.
crasny1
Posts: 6986
Date Joined: 16/10/08
It is plausible IMO as a science based worker
But I am still concerned about the evidence of damage inflicted to kidneys and liver (having said that I have only seen reports of this in 1 fish).
The fact that witnesses saw damage to gills thus is plausible with your explanation above. The fish sort of get a "pulmonary oedema" equivalent in their gills due to irritant effect aswell as rapid diurnal O2 level variation.
This can make sense, and would kill many species without discrimination. But didnt some claim that some invertebrates like crabs etc was effected??? Dont quote me but I do recall reading about lots of crabs on a rockwall, and then not being there!!?
"I would like to die on Mars. Just not on impact!!" _ Elon Musk
GGs
Posts: 330
Date Joined: 06/09/14
Someone finally backing up
Someone finally backing up their thoughts and not making sweeping statements - good work Mick C!
Crasny1 - I agree about the other organ effects but as a science based worker (I believe your a MD?) you would have to agree that having n=1 is not a solid foundation to draw any conclusions from.
As there have been alot of reports from both public and the authorities that dying fish appear to be gasping for air, would a pulmonary oedema-like syndrome and potential asphyxiation by water O2 depletion not cause this observation?
resurgence
Posts: 573
Date Joined: 23/04/14
Lynch mob mentality
Looks like a lot of people won't be willing to accept any answer other than the one they believe in, regardless of the evidence.
uncle
Posts: 9384
Date Joined: 10/02/07
ha ha
Do you believe everything big brother and government tell us !!
all aggressive fish love bigjohnsjigs
resurgence
Posts: 573
Date Joined: 23/04/14
I'm not paranoid
and I don't believe in conspiracy theories.
Scotte
Posts: 1142
Date Joined: 07/12/06
Was thinking the same thing
Was thinking the same thing resurgence.alot of innocent companies accused of being the cause
uncle
Posts: 9384
Date Joined: 10/02/07
my question is
did LJ or any of the others see this algee bloom, satilites etc, its a big rug!!
all aggressive fish love bigjohnsjigs
crowie
Posts: 91
Date Joined: 16/11/14
Just sayn
And i dont want to upset anyone but im all for the canals to go in at point peron and wouldn't canals open at both sides allow flow of water to that area on the east side of the cause way.
aaasnapper
Posts: 218
Date Joined: 15/01/10
Nope
Crowie, the design is not to channel through to the Shoalwater side. So by my reconning the Mangels bay marina will create a stagnet water body at he southern end. Considering the water quality in this part of the Sound is poor at the moment, what do you think the effect of the canals would add to the water quality?
Put it this way, if the marina goes ahead, we can expect more of these so called natural events.
null
crowie
Posts: 91
Date Joined: 16/11/14
Fair enough
however if it was open both sides it may be beneficial
sunshine
Posts: 2562
Date Joined: 03/03/09
.? But seemingly only moving south
Or is there different water exchange with the ocean in the northern part of the Sound as it seemed that the northern half remained unscathed
uncle
Posts: 9384
Date Joined: 10/02/07
sooooo
built in 1978 [finished], how many algee blooms fish kills since then and water flow is only now,still lots of questions remain
all aggressive fish love bigjohnsjigs
little johnny
Posts: 5345
Date Joined: 04/12/11
I think best way
To prove it is at rally. Take mussels from pylons (causeway bridge). Collect a few fish up from Sth end of sound. Invite health dept. fisheries. And government to have a barbie at beach on us. While they eat they can tell us cause of fish deaths . Would be nice gesture I think:):):):).
Moking
Posts: 1252
Date Joined: 30/05/12
I'll bring some fresh squid
I'll bring some fresh squid from Causeway area- I'll be back by 11.00.
Clean em on the beach and cook em up on the beach .Eat em on the beach.
Bend over with a belly ache on the beach.lol
My Dad taught me how to Fish-Thanks Dad.(RIP)
Notorious
Posts: 914
Date Joined: 23/02/12
BULLSHIT!Easier to blame
BULLSHIT!
Easier to blame natural cause than assign blame to a private corporation paying significant taxes
https://www.facebook.com/groups/174055815943047/?fref=nf
petermac
Posts: 2946
Date Joined: 03/03/10
exactly
like the fish this farce stinks from the head down convenient excuse used by the government dept involved still will say the navy need the microscope put on them over this but it wont happen
Jason P
Posts: 521
Date Joined: 16/02/13
Certainly not convinced yet,
Certainly not convinced yet, without any hard evidence.
If it was Algae the question would be where did this algae come from, maybe need better quarrentine of ships pumping out possible algae infected water from other countries.
I can see it is plausible but wouldn't think likely with a body of water that large to the open ocean.
DM306
Wes F
Posts: 1060
Date Joined: 07/01/12
Ballast water requirements
Having worked in the quarantine industry with international ships. It is Federal requirement that any ballast water which may be discharged in Australian waters must be collected in open ocean. There must be a equivalent of 95% of tank holding must be open ocean water. This transferr of water must be recorded in the ship's log book and can also be checked via the ship's voyage/plotter course. This record is check prior to any ship being allowed to proceed with discharging ballast water. Yes we still get marine pests entering our water ways from overseas but the majority come from external foulling on ships and smaller crafts i.e. yachts.
Old fishermen never die they just smell that way.
petermac
Posts: 2946
Date Joined: 03/03/10
come on wes do you realy believe those logs
in my many years working at east intercourse and parker point in dampier do you really believe those logs , i have been on line boats that have raw shit pumped on to them from the bulkys in the harbor and have been DE ballasting with the most foul smelling water i have ever smelt , the crews are not supposed to fish from the bulkys either when in harbor but many many line boat seaman have been smacked with a sinker and been hooked by a set gang hooks dropped down from a bulky
Wes F
Posts: 1060
Date Joined: 07/01/12
Peter
Raw sewerage is managed differently than ballast water. Since ballast water is held in tanks with no circulation or aeration it does become stagnant. How long ago was it that you were involved with international shipping. I was involved within the last 5 years with international shipping. The Quarantine requirements in Australian waters are the strictest in the world and if a vessel or company does not follow these regulations they are/will be banned from operating within Australian waters. Things have and do change Peter. I have seen this first hand. YES I DO BELIEVE THESE lOGS. a ship also needs to exchange ballast water in certain locations and can only does so at certain speeds, this can easily be check on the course charts which a captain will NEVER falsify. Random samples are also take when ships have taken up ballast at a high risk port.
As for raw shit being pumped directly onto a line boat your a bit close to a bulky that also goes for being hit by sinkers.
Old fishermen never die they just smell that way.
Mick C
Posts: 605
Date Joined: 26/12/13
Objective Analysis
Through this debate I have tried to be objective, and inform Members about the possible mechanisms of fish kills from my personal experience in having to deal with these matters in a number of instances. Do I genuinely believe the explanation provided through the media, no I don't. It is possible, but so are a lot of other causes.
As Jason indicates, it is all about the evidence. The community has not been provided with the data, other than being told that Fisheries will release a report at some time in the future. The critical evidence to test their hypothesis is the algae concentration (organisms per millilitre) and dissolved oxygen levels (milligrams per millilitre) in the water at various locations at the time or very soon after, the fish were killed. This information must be compared to published (peer reviewed) data that showed the concentrations will, in all probability, kill fish.
Unfortunately, I believe the response by the agencies was too slow. Relevant data must be collected quickly, because as explained in my other post the reliability of evidence diminishes within a short time frame. I am convinced that we will never really know the "true" cause with an acceptable level of certainty, however the Fisheries report may prove me wrong.
Ability is what you are capable of doing. Motivation determines what you do. Attitude determines how well you do it - LH.
BOB SLED
Posts: 18
Date Joined: 15/08/15
What a lot of crap
As with so much , we are being lied to by the media and the Goverment . NOT buying this BS
little johnny
Posts: 5345
Date Joined: 04/12/11
Mick c
You seem very cluey . How about turning your snapper right way up. Or do you prefer them belly up.. ( joke ha ha)
scano
Posts: 1246
Date Joined: 31/05/07
i call bullshit also
it hasn't been anywhere near hot enough as yet for Algal blooms to be prevalent within the Swan river, let alone the Cockburn sound area. Also if people remember correctly we had numerous days of long hot summers with 37 + degrees being the norm for nearly 10 days or more, and there weren't algae problems in the sound then.
Unless I am missing something the Algal blooms are normally started from lack of water movement and increased water temperature. it has been blowing its tits off for weeks on end here in Perth and also am I not mistaken in the sound being full of salmon only 6-8 weeks ago, and Salmon live in normally colder water climates.
Government is using the algal bloom theory to at least give some form of excuse for the recent fish deaths, most likely to appease the public and to divert the news headlines for the time being.
Scano
Wes F
Posts: 1060
Date Joined: 07/01/12
November temperature
Just a thought, would the algale bloom be a result of a warm November and low rain fall. Looks like the temperature on average was around 30 which I thought is a bit warmer than normal. The combination of warm weather, low rain fall the water/current direction and wind patterns may have trapped water in the Mangles bay area allowing for this to occur. Than when the larger tides or wind and current change large pockets of this water is than moving and therefore cousring the effect it has had on the fish poulation. Have seen the same effect at Coral bay during coral spawning when the currents and the prevailling wind does not allow the spawn to disperse out to the open/outside of the reef. ningaloo-atlas.org.au/sites/default/files/Anoxic%20impacts%20at%20Bill%E2%80%99s%20Bay%20during%202008.pdf
NOVEMBER
Temperatures
Average Maximum: 26.3C
Average Minimum: 14.2C
Highest Maximum: 40.3C on 24/11/1913 and 11/11/2003
Highest Minimum: 25.1C on 24/11/1920
Lowest Maximum: 15.8C on 2/11/1919
Lowest Minimum: 5.0C on 18/11/2004
Highest Average Maximum: 29.6C in 2010
Highest Average Minimum: 16.9C in 1982
Lowest Average Maximum: 21.5C in 1971
Lowest Average Minimum: 11.9C in 1954
Rainfall
Average Monthly: 22mm
Highest Monthly: 73.2mm in 1984
Lowest Monthly: 0.0mm in 1891
Highest in 24 Hours: 39.1mm on 29/11/1956
Highest Raindays: 14 in 1939, 1950 and 1965
Just my thoughts.
Old fishermen never die they just smell that way.
Wes F
Posts: 1060
Date Joined: 07/01/12
November temperature
Old fishermen never die they just smell that way.
ROCKPOM
Posts: 625
Date Joined: 23/04/07
As we all know the whole way
As we all know the whole way this has been handled is a joke/disgrace they may as well close Cockburn to fishing and hand it over to industry!! that may sound defeatist!!
But after sitting on quite a few meetings about Cockburn Sound water issues/Planning the result has always been to the detriment of the Sound!
Industry and its profits $$$ doesn't give a Shit about what's happening neither does the Navy!
I cant believe that the lack of Crabs and Prawns in Cockburn is related to water Temps it has all to do with salinity /Dissolved O2 as this became an issue after the desalination plant started.
To compound the Crab issue they let the Pros keep fishing until near collapse???
I also cant fathom the number of Pro licences still in place with the sound sitting on a precarious edge?
After fishing in the Sound for over 35years and 15years of research with the Snapper this Algae bloom is a crock of crap!
If Bi valves eat these little fish killing critters how come they haven't been picked up in the mussel testing?
and why weren't the Bi valves tested on the main tidal influence area under the causeway as this is the area where the killing continued as the tide went out???
Rather than grasping at an these "Likely" results they need to improve water quality.
petermac
Posts: 2946
Date Joined: 03/03/10
your dead right
roll on the mangles bay development , i am sure that will improve the water quality ( like Fuxx it will it will destroy what is left for our kids) bloody joke the whole situation
Bryce Day
Posts: 812
Date Joined: 01/06/15
Either way humans are to
Either way humans are to blame!
little johnny
Posts: 5345
Date Joined: 04/12/11
I blame
Causeway . No way is Sth end flushed enough. Needs more bridges. Can't blame industry for Sth end . Where industry is there is tones of life and nice sea grass???? Sth end algae . Slime and sea grass dying. Not saying industry helps it's about flushing. That's just my opionion. Not expert on matter. If mangles bay project goes ahead say bye bye.I can believe what I have been told. But I still would like them to eat food from coat hanger. Then I will 100 percent believe them. Under the jetty where I work thousands of bait every night . ???? Mullys and pinks???? Also crabs. Hmmm def not industry side
luke george
Posts: 554
Date Joined: 13/04/07
Wouldnt we also be able to
Wouldnt we also be able to see traces of the algae on the surface or washed up on the beach?
Fisher Kid
Posts: 358
Date Joined: 16/10/12
the algae is microscopic.
the algae is microscopic.
Although the government would have alterior motives I do believe the algal bloom. The symptoms the fish exhibit coincide with the cause.
I think some people don't realise the temperature being cited as a cause of fish deaths is about oxygen concentration in the water. my year 12 chemistry taught me that as temperature increases gas (oxygen) solubility decreases in water.
So at a time when oxygen levels were likely already low, an above average temperature allowed for oxygen solubility to decrease to dangerous levels. This combined with an algal bloom that interacts with gills and respiratory system of fishes means they have no chance of breathing, with impaired gills and dangerously low oxygen levels the fish are dead regardless.
Fishing and catching are two different things. But i want to learn how to catch.