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King Erik the 14th
 Post subject: Triploid trout
PostPosted: Oct 13th, '07, 20:20 
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Has anyone heard of, grown, or tasted these? They are a cross between a rainbow and a brown trout. Are they also called ocean trout, I'm not sure if they are the same. They are sterile, and the thought is that they grow faster because they are not spending energy on reproduction etc. The figure I was quoted was 1.6 kg in 12-15 months. Andrew at Aquaculture-advantage told me he's got between 350-500 for sale, but I'm still waiting for him to tell me the price.
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veggie boy
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PostPosted: Oct 13th, '07, 20:36 
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KE14

Someone else here was talking about them a while back - somebody in the west I think. Do a search KE14.
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RupertofOZ
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PostPosted: Oct 13th, '07, 20:44 
Quote:
Someone else here was talking about them a while back


Think that might have been someone on another forum VB :wink:
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himzol
 Post subject: Re: Triploid trout
PostPosted: Oct 14th, '07, 05:19 
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Hi KE 14,

I have heard of them and seen them, There is a trout hatchery in Tassie just a bit out of Hobart that used to stock them... Saw them when I went on a tour of the palce some time back.. I'll see if I can dig up the details.

I didn't think they were called Ocean trout though... I thought Ocean trout were the ones they take and grow out in sea penns like the ones they use for Tuna..

Himzo
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King Erik the 14th
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PostPosted: Oct 14th, '07, 18:25 
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Yeah I have a feeling that I saw a Tassie farm on Landline, where the fish started off life on an inland farm and were later grown out in the ocean. From memory they had a pink flesh like an Atlantic Salmon. Did you try some?
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RupertofOZ
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PostPosted: Oct 14th, '07, 18:53 
KE14.... the term "triploid" means sterile and is applied to many species.....

I have heard the same thing regarding the growth rates of "triploid" trout....

Rainbow trout spend periods of their life cycle at sea and are known as "Ocean Trout" during this phase....

They are similar to and related to Atlantic Salmon but are a different fish/species...

http://www.australian-aquacultureportal ... trout.html

Just to confuse things subspecies of brown trout (known as "Sea Trout" also migrate to sea.

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

I hadn't heard of a crossbred rainbow/brown trout...... but this (US) article seems to suggest that rainbows may have they ability to crossbred with other trout species....

http://northwesttrout.com/NewsItems/triploid.htm

Most "unnatural" cross-species breeding usually results in sterile offspring.
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Troutman
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PostPosted: Oct 15th, '07, 07:36 
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I have had a bit to do with triploid Rainbow Trout over the years. They are popular for stocking dams as they will grow to a larger size due to the fact that because they are sterile no growth or energy is wasted in egg production or playing the mating game. Triploiding only effects the female fish and usually not 100% of the ones that hatch from the eggs that were treated. As Trout dont breed until they are two years old you wont notice any difference in the growth rates until fish are older than that.
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King Erik the 14th
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PostPosted: Oct 15th, '07, 16:10 
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As Trout dont breed until they are two years old you wont notice any difference in the growth rates until fish are older than that.

That's good to know. I cant imagine keeping mine for more than 2 years.
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himzol
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PostPosted: Oct 15th, '07, 17:12 
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King Erik the 14th wrote:
Yeah I have a feeling that I saw a Tassie farm on Landline, where the fish started off life on an inland farm and were later grown out in the ocean. From memory they had a pink flesh like an Atlantic Salmon. Did you try some?


Yep, and it tasted a lot nicer than the fresh water raised trout.

BTW I made a mistake in what I was thinking of, the trout that these people breed is a tiger trout which is a cross between a Brook Trout and a Brown.
http://www.newnorfolk.org/~salmon_ponds/

Himzo.
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King Erik the 14th
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PostPosted: Oct 15th, '07, 20:14 
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I've had a reply back from Andrew @ Aquaculture-advandage:

Quote:
Hi David,



Triploid rainbow have an extra chromosome so are neither gender. Instead of energy going into the production of sex products at sub adult stage the growth is transferred to proteinaceous production. Hence super growth curves from that age on. No they are not genetically modified, however, they are chromosome manipulated by pressure to 10,000psi to stop the eradication of the polar cell during embryo development, hence neither xx or xy but xxy.



These spare fingerlings would be $0.60 – 0.70 each due to their uniqueness and are varying between 55mm and 60mm last grade last week, they are 6 weeks old. They will be offered on a first in first served basis uncontracted. We have another 2,000 at 85mm plus from the same batch which will go out to ponds end of November at around 150mm shooter average. At this point, new hatchery runs will start for the season.



Triploid trout require same temps as Rainbow…. 17-19.c. optimum… stress at 22.c… lethal starting at around 24.c …minimum 10.c before fish start to go off their food.


I'll post the rest of the email in another thread as he has offerred a discount price for various fingerlings if we can combine for a bulk order.
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RupertofOZ
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PostPosted: Oct 15th, '07, 21:10 
Not a bad price KEII..... interesting to see someone locally doing this....
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