Fish Farms

Status
Not open for further replies.
look who googled fish farms this morning

Just gota say this!!!
Wildman...your posts are SO OFTEN off topic, and of no relevance to the thread...like this one.
If you are referring to Agentaqua in your recent post above made this morning, what is your point????
....you need to follow his lead and post more information of value directed to the thread or just don't post!!!!
 
Last edited:
Here is a copy and paste from the Hunting thread...applies here too.

Ah...a conservation thread gone sideways...shocking. Once again, here is the reminder to keep the personal crap out of your posts. Cleaned up a couple posts and left a couple others for context. Don't like someone's point of view, debate it all you want. Get personal and disrespectful and it will be yanked from the thread or the thread will get shut down.
 
Molecular testing of adult Pacific salmon and trout (Oncorhynchus spp.) for several RNA viruses demonstrates widespread distribution of piscine orthoreovirus in Alaska and Washington
Authors
  • M K Purcell,


  • R L Powers,
  • J Evered,
  • J Kerwin,
  • T R Meyers,
  • B Stewart,
  • J R Winton
Abstract
This research was initiated in conjunction with a systematic, multiagency surveillance effort in the United States (U.S.) in response to reported findings of infectious salmon anaemia virus (ISAV) RNA in British Columbia, Canada. In the systematic surveillance study reported in a companion paper, tissues from various salmonids taken from Washington and Alaska were surveyed for ISAV RNA using the U.S.-approved diagnostic method, and samples were released for use in this present study only after testing negative. Here, we tested a subset of these samples for ISAV RNA with three additional published molecular assays, as well as for RNA from salmonid alphavirus (SAV), piscine myocarditis virus (PMCV) and piscine orthoreovirus (PRV). All samples (n = 2,252; 121 stock cohorts) tested negative for RNA from ISAV, PMCV, and SAV. In contrast, there were 25 stock cohorts from Washington and Alaska that had one or more individuals test positive for PRV RNA; prevalence within stocks varied and ranged from 2% to 73%. The overall prevalence of PRV RNA-positive individuals across the study was 3.4% (77 of 2,252 fish tested). Findings of PRV RNA were most common in coho (Oncorhynchus kisutch Walbaum) and Chinook (O. tshawytscha Walbaum) salmon.
http://onlinelibrary.wiley.com/doi/10.1111/jfd.12740/abstract
 
https://www.dnr.wa.gov/sites/default/files/publications/PRV whitepaper revised Sept 2017.pdf?3c0h5&b2f0s02j4i

Prepared By
The Pacific Northwest Fish Health Protection Committee
By
T.R. Meyers

Alaska Department of Fish and Game
Juneau Fish Pathology Laboratory

Summary Conclusion Based on Available Data: The ubiquitous nature of piscine orthoreovirus (PRV), its apparent historic presence in wild Pacific salmonid stocks in the Pacific Northwest and the lack of clear association with disease in Pacific
salmonids suggest the virus poses a low risk to wild species of Pacific salmonids.

Why PRV in the PNW is of low risk regarding HSMI in wild Pacific Salmonids

1. The disease “heart and skeletal muscle inflammation” (HSMI) has not been reported in wild
salmon populations in Norway or elsewhere and appears to only be a threat to farmed fish
2. While PRV causes HSMI in farmed Norwegian Atlantic salmon, high levels of PRV genetic
material have been detected in asymptomatic wild and cultured salmonids with no evidence of
HSMI disease
3. Histopathological lesions of HSMI were recently described as statistically correlated with the
presence of PRV at one Atlantic salmon farm in British Columbia, Canada (BC) while other
studies have detected the presence of PRV genetic material in wild and cultured Chinook, coho
and pink salmon and steelhead trout from Washington State, BC and Alaska where years of
surveillance have reported no presence of HSMI
4. Molecular testing of archived fish tissues in BC has shown that PRV was present in
asymptomatic wild and farmed Pacific salmon since 1987 and may have been present as early as
1977 before Atlantic salmon were imported for aquaculture
5. HSMI has not been reported in Pacific salmon or steelhead in North America to date
6. Laboratory studies with Chinook and sockeye salmon have demonstrated that PRV is infectious
and will persist for quite some time but does not cause fish mortality, HSMI, or any other
apparent disease
7. Development of HSMI and HSMI-like diseases of farmed salmonids (Atlantic and coho
salmon; rainbow trout) infected by PRV may be a result of different viral strains, host specific
antiviral responses and environmental stressors that do not appear to be present or active for
indigenous salmon on the Pacific Coast
8. The presence of PRV genetic material in Pacific salmon tissues is not sufficient evidence
for HSMI disease

The PRV strain present in indigenous Pacific salmon in the PNW, historically and experimentally, appears to be relatively benign and unable to produce significant disease or HSMI in native salmonids.
 
Last edited:

This story ran in newspapers across the country yesterday and today...more bad PR for Fish Farms.
"B.C. First Nation in federal court in bid to halt fish farm restocking
The Namgis First Nation of Alert Bay says prior to any fish transfer to an open-net pen at nearby Swanson Island, the Atlantic salmon smolts should be tested for the blood virus piscine reovirus."
http://business.financialpost.com/p...ral-court-in-bid-to-halt-fish-farm-restocking


Not an unreasonable request that these smolts be tested for disease is it???
But, I do recall a reliable source stating a very high percentage of Atlantic Salmon smolts are infected with PVR when released, but in the past our Government and DFO have not objected, perhaps because it is difficult or even impossible for Fish Farms to survive if they can't stock with diseased smolts.
 
Do hatcheries have to test their smolts before they transfer or release them for diseases like PRV?

Do our hatchery have the funds to bear these costs?
 
So then were do all these as you put it, diseased smolts come from? Curious?


The story I posted stated " prior to any fish transfer to an open-net pen at nearby Swanson Island, the Atlantic salmon smolts should be tested for the blood virus piscine reovirus."
Where exactly the diseased Atlantic Salmon smolts are transferred from is not the issue.
 
I'm not sure you understand what they are asking for

They are asking for the government to create regulation to test smolts when they are going to be transferred or released for PRV. I am not sure if you did not read the conclusions that the alaskan scientist have come to about PRV but you should probably refresh on that.

"Molecular testing of archived fish tissues in BC has shown that PRV was present in asymptomatic wild and farmed Pacific salmon since 1987 and may have been present as early as 1977 before Atlantic salmon were imported for aquaculture"

Why should our hatcheries be exempt from testing for a virus that exists in our wild and hatchery stocks?
 
Status
Not open for further replies.
Back
Top