Data shows decline in migratory fish populations 数据显示洄游鱼类种群数量下降

大西洋鲑和尼泊尔巨魾均属于被联合国列为全球优先保护对象的 30 种旗舰鱼类。 Population data of more than 15,000 species of freshwater migratory fish, which make ...