超级雄性鱼类：清除入侵物种的新策略

Supermale fish become new tactic for vanquishing invaders Hatchery-raised trout with double Y chromosomes can eradicate invasive populations ERIK STOKSTAD The Apache trout and round-tail chub that are native to Arizona’s West Fork Black River have long struggled to compete against invasive brook trout (Salvelinus fontinalis). So it may seem strange that biologists are dumping even more hatchery-raised brook trout into the river. But these new trout were bred to have a genetic quirk designed to doom the population. Sometimes called supermales or Trojan YY males, they have two Y chromosomes instead of one. When supermales mate with female wild trout, the offspring are all male—eventually producing a population that consists only of elderly bachelors. …