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If the  pond is that shallow, it might have frozen to the bottom or nearly
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so and killed the gold fish in the winter.  I would rule that out before looking
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to other possible causes.  Gold fish multiply very rapidly -
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hence they are popular for stores.
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The frozen gold fish would keep in cold storage but they will soon disappear.
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Enjoy the spring
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Paul
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<br/>> On May 1, 2015 at 9:38 AM "George E. Forsyth" <g4syth@nspes.ca> wrote:
<br/>>
<br/>>
<br/>> Hi Andrew,
<br/>>
<br/>> The pond is very shallow, if you really wanted to, you could walk
<br/>> across and keep your shoulders dry. The water enters through an
<br/>> underground pipe from a water body in a wet hollow above the skating
<br/>> pond. The water then flows out through a vertically placed pipe at the
<br/>> bottom end of the pond. The brook runs along about thirty feet beside
<br/>> the pond.
<br/>>
<br/>> See Google maps: 45.093621, -64.412400
<br/>>
<br/>> I had noticed goldfish last summer and they must have been here for
<br/>> awhile as some of the dead fish are eight inches long. Other species
<br/>> were not noted, but I didn't really study them and there are literally
<br/>> hundreds. I have lived here for almost thirty years and have never
<br/>> seen this many dead fish, and hadn't noticed goldfish here.
<br/>>
<br/>> To be honest I wasn't too concerned that goldfish had been killed, as
<br/>> the pond doesn't seem to host peepers and toads any more. They
<br/>> probably have eaten most of the eggs and tadpoles. But the kingfishers
<br/>> and herons have been coming to the pond regularly the past few years.
<br/>>
<br/>> If they have been intentionally poisoned would other species be killed
<br/>> as well?
<br/>>
<br/>> I'll try to get some pictures.
<br/>>
<br/>> Yours truly,
<br/>>
<br/>> George Forsyth
<br/>>
<br/>>
<br/>>
<br/>>
<br/>> Quoting "Hebda, Andrew J" <Andrew.Hebda@novascotia.ca>:
<br/>>
<br/>> > Hi George
<br/>> >
<br/>> > If there was a lot of organic matter in the bottom of the pond,
<br/>> > could have caused a stripping of the oxygen as decomposition
<br/>> > progressed. Anyother species?
<br/>> >
<br/>> > As well, any idea how long the goldfish have been in that pond...
<br/>> > they are not native, so would have had to have been a
<br/>> > release/introduction.
<br/>> >
<br/>> > Andrew
<br/>> >
<br/>> > A Hebda
<br/>> > NSM Collections (Zoology)
<br/>> > ________________________________________
<br/>> > From: naturens-owner@chebucto.ns.ca [naturens-owner@chebucto.ns.ca]
<br/>> > on behalf of George E. Forsyth [g4syth@nspes.ca]
<br/>> > Sent: April-30-15 10:18 PM
<br/>> > To: naturens
<br/>> > Subject: [NatureNS] fish kill Port Williams skating pond
<br/>> >
<br/>> > Hi,
<br/>> >
<br/>> > The other evening I was out for a walk and noticed hundreds of gold
<br/>> > fish floating on the edge of the Port Williams, Kings Co, skating pond
<br/>> > on Belcher St. I don't know if this is a result of accidental or
<br/>> > intentional poisoning, or were they killed by natural causes as a
<br/>> > result of the longer than usual ice and snow cover? There was a good
<br/>> > selection of small and large fish, I only noticed gold fish. It was
<br/>> > quite impressive how many there were!
<br/>> >
<br/>> >
<br/>> > George Forsyth
<br/>>
<br/>>
<br/>>
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