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>>> 2 --1146854128-380755096-1352117827=:51248 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable A library patron I was talking to a few Saturdays ago suggested farmed salm= on escapees should not be a problem, at least genetically,=A0 because they = are using triploid fish. Does this stop interbreeding with wild stocks beca= use the triploid fish do not mature? Does this even prevent genetic mixing = with native fish?=0A=0A=0ANancy=0A=0A=0A________________________________=0A= From: David & Alison Webster <dwebster@glinx.com>=0ATo: naturens@chebucto.= ns.ca =0ASent: Sunday, November 4, 2012 1:08:28 PM=0ASubject: Re: [NatureNS= ] re West coast:Fw: Farmed Salmon=0A =0AThanks Dave P. & John. Good to lear= n about an objective study & hear from the voice of experience. Start small= is sound advice when doing something new.=0A=A0 Perhaps the underlying pr= oblem is that both the wild fishery and salmon farming can be too darn prof= itable ! A friend of Alison's from the Shetland Islands lamented about 10 y= ears ago that it was difficult to keep young men in school there when they = can earn enough in the fishery (no need for high school) to retire by 30 or= so.=0AYt, DW=0A----- Original Message ----- From: "John and Nhung" <nhungj= ohn@eastlink.ca>=0ATo: <naturens@chebucto.ns.ca>=0ASent: Sunday, November 0= 4, 2012 10:57 AM=0ASubject: RE: [NatureNS] re West coast:Fw: Farmed Salmon= =0A=0A=0A> To:=A0 all=0A> =0A> From:=A0 John Sollows=0A> =0A> Date:=A0 Nov.= 4/12=0A> =0A> (Hi, Dave!)=0A> =0A> Cannot resist chiming in, having spent = most of my working life involved with=0A> low-tech aquaculture for the bene= fit of the poor in less favoured societies.=0A> =0A> I never did like salmo= nid culture much for two reasons:=A0 (1) Salmonids are=0A> carnivorous, so = my vision of aquaculture as a reliever of pressure on wild=0A> stocks is no= t likely to be realized by culture of same.=A0 More the reverse.=0A> (2) My= vision of aquaculture as a producer of high-quality protein for poor=0A> p= eople is similarly not likely to be met by salmonids, which are relatively= =0A> pricey.=0A> =0A> Thirty years ago, I didn't foresee sufficiently the p= otential of large-scale=0A> farms to pollute, but did feel very uncomfortab= le about introduction of=0A> Atlantic salmon to B.C. because they were exot= ics , with all the invasive=0A> potential that that might imply.=0A> =0A> I= belong to an environmental group which does not support cage culture of=0A= > salmonids and I personally support that stand.=A0 But more importantly, I= feel=0A> strongly opposed to the rapid expansion currently underway.=A0 A = few cages in=0A> an embayment may cause no noticeable harm, but things can = change enormously=0A> if the size of the operation is increased tenfold, an= d I find proposals to=0A> drop tens of cages into virgin sites foolhardy an= d irresponsible.=A0 The=0A> sermon I always preached to anyone considering = aquaculture always included=0A> the following:=A0 "Start small," and that s= hould apply as strongly here as in=0A> the Third World.=0A> =0A> Isn't this= just common sense, or am I missing something?=A0 And common sense=0A> asid= e, horror stories exist already of what may happen after an operation=0A> g= ets very large.=A0 We can argue till the cows come home about whether or no= t=0A> subsequent disasters are due to overly rapid expansion, and the naysa= yers=0A> can (somewhat disingenuously) shout that there is no evidence that= there is=0A> a cause-and-effect relationship, but sometimes, common sense = and experience=0A> similar to those discussed in the paper you quote, Dave,= should carry the=0A> day.=0A> =0A> Time to shut up, for now!=0A> =0A> ----= -Original Message-----=0A> From: naturens-owner@chebucto.ns.ca [mailto:natu= rens-owner@chebucto.ns.ca]=0A> On Behalf Of David Patriquin=0A> Sent: Novem= ber-04-12 10:03 AM=0A> To: naturens@chebucto.ns.ca; James W. Wolford=0A> Cc= : NatureNS=0A> Subject: Re: [NatureNS] re West coast:Fw: Farmed Salmon=0A> = =0A> The paper by by Ford and Myers 2008 is relevant:=A0 "Since the late 19= 80s,=0A> wild salmon catch and abundance have declined dramatically in the = North=0A> Atlantic and in much of the northeastern Pacific south of Alaska.= In these=0A> areas, there has been a concomitant increase in the productio= n of farmed=0A> salmon. Previous studies have shown negative impacts on wil= d salmonids, but=0A> these results have been difficult to translate into pr= edictions of change in=0A> wild population survival and abundance. We compa= red marine survival of=0A> salmonids in areas with salmon farming to adjace= nt areas without farms in=0A> Scotland, Ireland, Atlantic Canada, and Pacif= ic Canada to estimate changes=0A> in marine survival concurrent with the gr= owth of salmon aquaculture. Through=0A> a meta-analysis of existing data, w= e show a reduction in survival or=0A> abundance of Atlantic salmon; sea tro= ut; and pink, chum, and coho salmon in=0A> association with increased produ= ction of farmed salmon. In many cases, these=0A> reductions in survival or = abundance are greater than 50%. Meta-analytic=0A> estimates of the mean eff= ect are significant and negative, suggesting that=0A> salmon farming has re= duced survival of wild salmon and trout in many=0A> populations and countri= es." The effects were largest for the Bay of Fundy.=0A> =0A> Jennifer S. Fo= rd*, Ransom A. Myers? A Global Assessment of Salmon=0A> Aquaculture Impacts= on Wild Salmonids 2008 in PlosBiology - the full paper=0A> is available he= re:=0A> http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.p= bio.00600=0A> 33=0A> =0A> =0A> =0A> =0A> Quoting "James W. Wolford" <jimwol= ford@eastlink.ca>:=0A> =0A>> Interesting notes, Dave, and I'm responding of= f the top of my biased=0A>> head from that West, namely central B.C.=A0 I a= m biased about=0A>> open-net- pen salmon farming which is so wrong in so ma= ny ways.=A0 But I=0A>> think we=A0 in the East have a lot to learn from the= history and=0A>> experiences of=A0 the salmon-farming industry in New Brun= swick, about=0A>> which we in Nova=A0 Scotia seldom hear much, even from CB= C News and=0A>> Marit