论文部分内容阅读
根据放养资料、捕捞量情况及城东湖饵料生物现状,对城东湖鱼产力、鲢、鳙鱼蕴藏量、银鱼产卵群体量进行估算,确定鲢、鳙鱼投放比例、投放规格及投放量,确定银鱼合理捕捞量,确定银鱼留存量。研究表明,城东湖每年投放鲢、鳙鱼种25万kg(合300万尾)为宜,鲢、鳙比例为5∶1。2005年城东湖银鱼合理捕捞量为12万kg,留存量为4.04万kg,留存量占资源量的25.1%。
According to the stocking information, catches and the status quo of feeding organisms in Chengdong Lake, the stocking capacity of fish, silver carp and bighead carp in Chengdong Lake and the spawning population of silverfish were estimated to determine the proportion of silver carp and bighead carp released, , Determine the reasonable fishing of silverfish, silverfish to determine the stock of retained. The research shows that annual throwing silver carp and catfish species 250 000 kg (3 million) are suitable for Chengdong Lake, the ratio of silver carp and bighead carp is 5: 1. In 2005, the reasonable catches of Chengdong Lake silverfish were 120,000 kg, 40,400 kg, retained the amount of resources accounted for 25.1%.