03-05-2003, 04:32 PM
The Splake raised in Utah hatcheries are supposed to be sterile. It is done using temperature changes during the fishes early life. I don't know all of the details. Just like the "sterile" Rainbows planted in Strawberry, a small percentage of fish are capable of spawning. It is not an exact science, just very close. I've heard estimates of 97-98%.
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