The third period is from 1970s to the mid-1980s. During this period the development of Chinese marine fishing accelerated. The catches were mainly promoted by increasing fishing effort. The percentage of traditional fishery species became lower and lower. Traditional peak fishing seasons for most traditional fishery species no longer gave good catches,and some species even disappeared altogether. Most catches came from small, low-quality fishes and were from upper-middle layer of the sea.Fish resources were in a stage of severe recession.