影响我省鱼类资源变动的原因主要有两个方面:一是自然条件的变迁,二是人为因素的干扰。一、自然条件的变迁自然条件的变迁,主要表现在湖场的淤塞。洞庭湖原是我国第一大淡水湖泊,后因长江北岸堵口,逼水南迁,松滋、太平、调弦、藕池相继决口,形成东河改 There are two main reasons that affect the change of fish resources in our province: one is the change of natural conditions; the other is the interference of human factors. First, the changes in natural conditions Changes in natural conditions, mainly in the lake blockage. Dongting Lake was originally China’s largest freshwater lake, because of the blocking of the north bank of the Yangtze River, forced water south, Song Zi, peace, tuning, Ouchi have Bukou, the formation of the East River