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—Photo courtesy IDAHO DEPARTMENT OF FISH AND GAME Stocking trials of YY Brook Trout in four Idaho streams began in 2014, and the first results are encouraging. A marked YY Male was observed actively spawning in October with a wild female, and testing done on wild fry in study streams in 2015 conclusively showed that some YY males successfully spawned. Of equal note, all progeny of stocked YY fish found were XY males, exactly as predicted and as investigators hoped.

—Photo courtesy IDAHO DEPARTMENT OF FISH AND GAME Stocking trials of YY Brook Trout in four Idaho streams began in 2014, and the first results are encouraging. A marked YY Male was observed actively spawning in October with a wild female, and testing done on wild fry in study streams in 2015 conclusively showed that some YY males successfully spawned. Of equal note, all progeny of stocked YY fish found were XY males, exactly as predicted and as investigators hoped.

October 2, 2016

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IFG develops way to control fish populations
October 2, 2016 1 a.m.

IFG develops way to control fish populations

Hatcheries have long been used to replenish and restore fish populations, but can they also be used to reduce or eradicate them? Idaho Fish and Game researchers are studying whether using traditional hatchery technology in a nontraditional way can eliminate unwanted fish populations in the wild.