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[clarki]

I see on the fish stocking database that annual destination lake for our boys fishing trip was stocked in Fall 2014 with AF3N (triploids).  Each year previous it was stocked with diploids (2N). The plan for 2015 is to return to diploids. Fish are stocked at just over 1 gram in weight

I've done a couple of searches but I can't seem to find any information about the comparative growth rates of AF3N vs 2N.

A nudge in the right direction would be appreciated.

Cheers.

         

[clarkii]

Same strain? Or did they put in AF3n Fraser Valleys instead for one year?

[clarki]

Same strain: Pennask

[typhoon]

They grow at the same rate until sexual maturity, so I would expect this year they are are all the same size.

Spawn bound diploids take the biggest penalty in growth rate but every Rainbow that spawns loses weight during that period.
In the high productivity lakes I fish, the diploids that have spawned have at least 25% less girth than triploids which amounts to a lot of weight.

[clarki]

Thanks 'phoon. That 25% value is interesting.

I'd be curious to see a graph that compares weight over time for AF3N and 2N of the same age. Be interesting to see how the lines representing the two data sets diverge after the first, and subsequent, spawns.

I bet a comparative ike that exists somewhere on the net, just need to keep trolling...

[typhoon]

Admittedly my estimates are pretty coarse. I rarely measure girth so can't give an accurate value.
I'm sure the Freshwater Fisheries Society would have this data.