View Full Version : Triploid Trouble?

03-22-2012, 11:27 AM
Idaho’s experience comparing 3n and 2n catchable rainbow trout plants in 13 lakes and reservoirs:


https://research.idfg.idaho.gov/Fisheries Research Reports/ResNAJFMKoenig2011 Performance Diploid Triploid Catchable Rainbow Lakes Reservoirs.pdf

The journal article answers some of the questions posed in the slide show.

Surprising and maybe a little troubling.

Way out ahead of California, Idaho has been planting mostly triploid trout to protect the genetic integrity of indigenous trout for years. Now, these Idaho researchers are suggesting fisheries managers consider reverting to planting normal diploid trout where native trout are not a concern because diploid plants provide a better return to the fishery. In California’s the switch triploids, Camanche is one of the first reservoirs to receive all triploid plants. I know some Camanche regulars are hoping for the appearance of giant sized muscle bound triploid fish growing up in the reservoir. From what I hear the large fish that are being caught are recent plants reared to large size planted by EBMUD. It is probably to early to blame the “slow” fishing this past winter on poor performance of DFG triploid catchable plants, and to see any jumbos develop, but the next couple of years should tell the story. Some good news is an earlier study (2000) indicated equivalent performance of 2n and 3n catchables in contributing to the catch when planted in Idaho streams. Hopefully, if triploid plants are determined to perform poorly in some of our lakes and reservoirs, an alternative can be found.