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 Silver Carp Hypophthalmichthys molitrix caught in Britain

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Ed Randall

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PostSubject: Silver Carp Hypophthalmichthys molitrix caught in Britain   Wed Jul 06, 2011 8:18 am

A new threat, in Anglers Mail yesterday 5th July 2011:
http://www.anglersmail.co.uk/news/silver-carp-scare/

The article says it was probably "accidentally" stocked with other fish, how that could have happened is beyond me, the eggs / fry must have come from overseas. That's criminally negligent quality control. I hope it was destroyed and not put back.

This is the fish that gets Carp a bad name in the USA, it is widely regarded as a pest. Search YouTube for videos of them jumping out like crazy when alarmed by a passing boat. They breed like nothing else and out-compete most other species.
They were originally brought in as a food fish and to control blue/green algae which is not dangerous to them - ironically they merely concentrate the algae in their bodies, becoming poisonous and inedible.

Because they are filter feeders, they are difficult to catch by normal angling methods so they are useless as a sport fish.

In the USA they are desperately trying to think of a way to stop them getting in to the Great Lakes, the best they can come up with so far is dumping sewage in the connecting canals to create a dead zone which the fish cannot cross!

To me this is as big a threat as sewage dumping, if they are being kept anywhere in this country they will escape at some point. If they get in to our rivers, the rivers will rapidly fill up with them and become unfishable for anything but these pests. (The only upside being that if you are the type of person who likes to kill and cook your fish, no-one is going to complain if you take one of these).

http://en.wikipedia.org/wiki/Silver_carp

I trust that the EA will immediately electro-fish the venue where this was caught and eradicate them all and continue monitoring it regularly until they are gone.
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Ed Randall

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PostSubject: Re: Silver Carp Hypophthalmichthys molitrix caught in Britain   Wed Jul 06, 2011 1:10 pm

More than you'd ever want to know about Hypophthalmichthys :
www.csu.edu/cerc/documents/AsianCarpEnvironmentalRiskAssessment.pdf

(I suspect the one in Anglers Mail is a Bighead not a Silver, or at least a hybrid. Can't see the fins properly but the eyes are very low down and Bighead can be caught by angling)
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James Page



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PostSubject: Re: Silver Carp Hypophthalmichthys molitrix caught in Britain   Wed Jul 06, 2011 2:09 pm

nice one ed
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Chris Daphne
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PostSubject: Re: Silver Carp Hypophthalmichthys molitrix caught in Britain   Wed Jul 06, 2011 7:14 pm

I know of a pond in Scotland that has these, its at a fisheries college though. But all the same these are a serious threat, did anyone see river monsters, these things totally deplete plankton and micro organisms leaving nothing for other fish/fry. They have a really efficient filter.
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Chris Daphne
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PostSubject: Re: Silver Carp Hypophthalmichthys molitrix caught in Britain   Wed Jul 06, 2011 7:26 pm

Thats the trouble with all alien invasive species, the natives just cannot cope and as there is often no natural predator they soon take hold. Once established they are often impossible to eradicate. It is also important to realise that more often than not they have an indirect effect especially when the invader is non predatory...a prime example is the humble minnow in my area.

These are not native here and have been introduced by anglers when livebaiting was allowed. Most waters especially ones near roads are stuffed with minnows. We only have salmonid species and eels and most people think that the trout etc will eat them and get big...what actually happens is that the minnows push up into the streams en masse, especially at spawning time, they then outcompete the juvenile salmon and trout which drop out into the lochs where they are predated on by larger trout. In addition, the juvenile trout that remain struggle for territory and of course food, which is usually available in small amounts as waters are usually deemed unproductive dur to the location, temperature and lack of nutrients.

As anglers it is imperative that all suspicious species are reported to the relevant authoriites be it plant or animal. We are the eyes and ears on the river banks and usually first to see when something is amiss. Remember Invasive species pose the biggest single threat to biodiversity which then has a knock on effect to our own social and economic way of life.
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Colin Brandon



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PostSubject: Re: Silver Carp Hypophthalmichthys molitrix caught in Britain   Wed Jul 06, 2011 8:15 pm

I reckon Thames Water have got there first with the sewage dump idea...........

Are they prolific breeders on account of the warm water habitat over there?
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