My understanding of the triploid process is that it was mainly devised to prevent the resulting rainbows from being able to spawn and to prevent them going into breeding condition. The main purpose being to lessen the risk of any adverse effect of stocking the resultant trout into non native waters. The year round good condition is also of obvious benefit when stocking our waters.

I understood it was fool proof, but apparently not so!



Presumably the egg that eventually produced this hen fish somehow resisted the triploid(ing) process. It was absolutely solid with ova! Fought very well for a pot bellied rainbow.

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what an 'orrible fish

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WHEN YOU LEAVE THE RIVER, TAKE NOTHING, AND LEAVE ONLY FOOTPRINT'S!!!

THA CAN TELL A YORKSHIREMAN ,BUT THA CAN'T TELL HIM MUCH !!

looks like a pacu.

We have had rainbows bread in the past and cock fish have been caught so i would say it is not fool proof.
I have never seen a rainbow that shape before looks like it may become egg bound.
Poor fish just needs a good cock to help her out

Munro

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Its not 100% proof, but its getting there, hatcheries who use a pressure vessel acheive the best results in the very high 97-98% success rate.

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So if we release 1 million of the best available triploids there'll be 20,000-30,000 breeders. I'd no idea the system was that poor.

The very best hatcheries who use a pressure vessel are hitting 100% others getting used to the method are getting there quickly.

Pressure vessel are taking over from heat or chemical as a way of producing trips & will in the very near future give you a 100% result.

You do on the rare occasion see an odd trip with eggs, cant honestly remember the last time I saw a cock fish.

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I had one last year, from Avon Springs, and this one, from Avington.

Avington probably produce 30,000+ fish for their own stocking purposes and many more are/will be supplied to other fisheries. It seems the occasional hen fish turns up, perhaps three so far this year, but no-one seems to have seen a cock fish. Even then I'm not convinced they are viable breeders.

I guess it could be argued that this particular fish could have been intercepted prior to stocking into the lakes. Surely it wouldn't have developed into that condition post stocking?

In any event, despite the obvious, the fish was in good physical condition and fought very well indeed. Just somethig out of the ordinary and not the normal very high standards I have come to expect from Avington.

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It is horrendous isn't it? And what happens when some of those breeders turn out to be tetraploid mutants? Lord help us... potentially a long kiss goodbye to your wild populations.

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"A homeward tramp thro' mist wrapped night,
With heart and creel in common light,
Complete content, the day has brought it,
They fished for pleasure - and they caught it"

P F Morgan
taken from the catch record book at Llanthony Hotel, Honddu Valley, Aug 1942

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