[NatureNS] re West coast:Fw: Farmed Salmon

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Date: Mon, 5 Nov 2012 04:17:07 -0800 (PST)
From: Nancy Dowd <nancydowd318@yahoo.ca>
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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