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P The paper by by Ford and Myers 2008 is relevant: "Since the late 1980s, wild salmon catch and abundance have declined dramatically in the North Atlantic and in much of the northeastern Pacific south of Alaska. In these areas, there has been a concomitant increase in the production of farmed salmon. Previous studies have shown negative impacts on wild salmonids, but these results have been difficult to translate into predictions of change in wild population survival and abundance. We compared marine survival of salmonids in areas with salmon farming to adjacent areas without farms in Scotland, Ireland, Atlantic Canada, and Pacific Canada to estimate changes in marine survival concurrent with the growth of salmon aquaculture. Through a meta-analysis of existing data, we show a reduction in survival or abundance of Atlantic salmon; sea trout; and pink, chum, and coho salmon in association with increased production of farmed salmon. In many cases, these reductions in survival or abundance are greater than 50%. Meta-analytic estimates of the mean effect are significant and negative, suggesting that salmon farming has reduced survival of wild salmon and trout in many populations and countries." The effects were largest for the Bay of Fundy. Jennifer S. Ford*, Ransom A. Myers? A Global Assessment of Salmon Aquaculture Impacts on Wild Salmonids 2008 in PlosBiology - the full paper is available here: http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.0060033 Quoting "James W. Wolford" <jimwolford@eastlink.ca>: > Interesting notes, Dave, and I'm responding off the top of my biased > head from that West, namely central B.C. I am biased about > open-net- pen salmon farming which is so wrong in so many ways. But > I think we in the East have a lot to learn from the history and > experiences of the salmon-farming industry in New Brunswick, about > which we in Nova Scotia seldom hear much, even from CBC News and > Maritime Noon etc. There is a lot of knowledge and expertise in > the Conservation Council of New Brunswick, especially Inka > Milewsky? who traveled to Shelburne in attempt to let the people in > SW NS communities the on-going environmental effects of salmon > feedlots. Also the history of the Inner Bay of Fundy Salmon should > be somewhat instructive in the chronology of the sharp demise from > 40,000 adults in various rivers in 1989? to less than 200 (100?) > now. (Figures from a sign in Miner's Marsh in Kentville from the > Atlantic Salmon Federation et al.) Finally, Jim Gourlay, who > published the magazine Eastern Woods and Waters for a long time, is > very knowledgeable about wild salmon as well as the history of > salmon farming in the Bay of Fundy. > > Cheers? from Jim in Burn's Lake, B.C. > -------------------- > > Begin forwarded message: > >> From: David & Alison Webster <dwebster@glinx.com> >> Date: November 3, 2012 9:10:52 PM ADT >> To: NatureNS@chebucto.ns.ca >> Subject: [NatureNS] West coast:Fw: Farmed Salmon >> Reply-To: naturens@chebucto.ns.ca >> >> Dear All, Nov 3, 2012 >> Further to my e-mail of June 9, I happened recently to run into >> an article about salmon on the West Coast (Natural History 104(9): >> 26-39,1995). At that time fluctuations over a 100+ year period >> seemed to be reasonably well explained by cyclical changes in >> weather, wind and ocean currents. >> >> With respect to Chinook salmon on the west coast there was "...a >> period of sustained harvest from 1889 to 1920, the period from 1921 >> to 1958 was one of sharp decline and from 1959 to the present we >> had a period of persistent salmon depletion."; page 31. On page 34 >> there is mention of a cool wet period from the 1960s to the 1980s >> when stocks briefly increased. 1920 to 1950 was a hot dry period; a >> time of sharp decline. Note from the 50s onward there was >> cumulative habitat degradation from logging. >> >> In contrast, Salmon farming started in BC in the early 70s. >> http://www.farmedanddangerous.org/solutions/industry-reform/history- in-bc/ >> Note that the period of steep decline over 37 years all took place >> before salmon farming started. And the period of modest increase >> was after farming started. >> >> Perhaps, with respect to salmon farming, crap is not >> exclusively under salmon pens; some may be about salmon farming. >> >> Yt, Dave Webster, Kentville >> >> ----- Original Message ----- From: "David & Alison Webster" >> <dwebster@glinx.com> >> To: <NatureNS@chebucto.ns.ca> >> Sent: Saturday, June 09, 2012 9:12 PM >> Subject: Farmed Salmon >> >> >>> Dear All, June 9, 2012 >>> There has been numerous articles and letters recently about >>> open-pen Salmon farms. One in particular caught my eye (June 9, >>> CH, Jim Gourlay) "...proven devastation of wild Atlantic Salmon >>> stocks wherever open-pen salmon aquaculture has been sited..." >>> >>> As I recall, salmon stocks were in very bad shape before >>> culture of salmon was initiated; culture of salmon being a way to >>> offset the shortage of wild salmon and take some pressure off of >>> these wild stocks that were probably being overfished off Greenland. >>> >>> Are there really examples of abundant salmon stocks in areas >>> where there has been no open-pen salmon farming ? >>> >>> Yt, Dave Webster, Kentville >> > >
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