苏联淡水渔业发展速度不快.近年来产量上升缓慢和平均单产不高是由于生产中存在着以下一些主要问题所致.1.投放鱼种的数量普遍不足,规格小.缺乏可供放养的鱼种也是目前大量水域未能充分利用的一个因素.2.生产过程机械化程度低,为30-40%.一些繁重的劳动基本上未摆脱手工操作.每 The development of the Soviet Union’s freshwater fisheries is not fast, and in recent years the slow increase in production and the low average yield are due to the following major problems in production: 1. There is generally insufficient quantity of sown species and small size. But also a factor that has not been fully exploited in a large number of waters at present.2.The mechanization of the production process is low at 30-40% Some of the heavy labor is basically not out of manual operation