摘要
根据1994~2001年的监测结果,结合历史资料对长江中上游四大家鱼资源现状进行了分析。结果表明:(1)长江中上游四大家鱼在渔获物中的比列呈下降趋势;(2)四大家鱼群体结构中低龄鱼比重上升,高龄鱼比重下降;(3)1997~2001年监利江段四大家鱼鱼苗径流量分别为35.87亿尾、27.47亿尾、21.54亿尾、28.54亿尾和19.04亿尾,与1981年该江段67亿尾相比,分别下降46.5%、59.0%、67.9%、57.4%、71.6%。针对影响长江四大家鱼资源的主要因素,提出了保护长江四大家鱼繁殖和栖息地,保持天然水域的相对稳定,降低长江四大家鱼捕捞强度,加强渔政管理等一系列保护长江四大家鱼的措施。
The four famous Chinese carps, i.e, the black carp (Mylopharyngodon), the grass carp (Ctenopharyngodon.idellus), the silver carp (Hypophthalmichthys molitrix) and the big-head carp (Aristichthys nobilis) are the main species for freshwater fishery and aquaculture in China. According to the monitoring results from 1994 to 2001 and historical data, this paper deals with the analysis of the status of fishery resources of Chinese carps.The results obtained are: (1) The ratio of Chinese carps in fishery has droped in the middle and upper reaches of the Yangtze River; (2)The proportion of the low age groups of Chinese carps increased and the advanced age group decreased; (3) The runoff of fry of Chinese carps was 3.587 billion, 2.747 billion, 2.154 billion,2.864 billion, 1.904 billion in the Jianli Section of the Yangtze River from 1997 to 2001 respectively,when comparing with 6.700 billion in 1981, Base on the main influencial factors strategies to manage the four famous Chinese carps resources were proposed, such as protecting spawning grounds, preserving relatively stablization of natural waters, enhancing fishery management, building the carps releasing stations,establishment the managment system of germplasm resources in the Yangtze River.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2004年第2期183-186,共4页
Resources and Environment in the Yangtze Basin
基金
国务院三峡工程建设委员会办公室项目
中国长江三峡工程开发总公司基金(SX97-01)
国家自然科学基金(30371105)联合资助.
关键词
长江中上游
青鱼
草鱼
鲢鱼
鳙鱼
渔业管理
管理模式
水产资源
the four famous Chinese carps
monitoring of fishery resource
fishery management
the middle and upper reaches of Yangtze River