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环境污染会使人类发现许多奇怪的现象。这里就有一例——雄性鱼变性。在正常的情况下,动物一出生,它的性别就确定了,而且终生不变。然而,最近,人们在美国特拉华州、俄亥俄州、宾夕法尼亚州萨斯奎哈纳河水域捕获了一些小口黑鲈却具有两种性别,即它们既是雄性鱼,又是雌性鱼。雄性鱼变性的现象越来越多。一开始,人们感到诧异;后来,人们觉得不安了;但现在,每每在切萨皮克湾流域中捕获到这样的雄性变性鱼,人们只剩下焦虑了。美国渔业和野生动物服务局的工作人员进行了后续调查,他们发现在有
Environmental pollution can make human beings find many strange phenomena. Here’s one example - male fish degeneration. Under normal circumstances, the animal is born, its gender is fixed, and life-long change. However, recently, a few smallmouth bass were caught in the waters of the Susquehanna, Delaware, Ohio, Pennsylvania, but both sexes were male and female. Male fish denaturation more and more. People were surprised at first; then people were feeling uneasy; but nowadays, it is only anxiety that often catches such male degenerated fish in the Chesapeake Bay basin. A follow-up survey was conducted by staff of the US Fisheries and Wildlife Service who found that