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A lack of oxygen in waters around the world could be doing more than just suffocating fish: It may be acting as an endocrine disruptor and impeding their ability to reproduce, posing a serious threat to the survival of many populations. A new study of carp suggests that hypoxia, or oxygen deficiency, is an endocrine disruptor. The findings add a surprising member to the growing list of potential hormone-disturbing agents ? a list that includes pesticides such as atrazine and DDT, various types of steroids and metals, and even ultraviolet light. And because it occurs across vast stretches of water around the world, hypoxia could be a greater concern than any of these.