摘要
1993年2月至1994年1月,在长江开敞型的天鹅洲故道采集鱼类49种,分属5目13科,其鱼类群落由湖泊型鱼类和江河型鱼类组成。Shannon指数、Wilhm改进指数和Simpson指数分别为3.70、4.19和0.89;均度为0.66。年总渔获量为374530.8kg,其中青鱼、草鱼、鲢及鳙共占17.97%。由于捕捞过度,天鹅洲故道鱼类群落表现为强烈的小型化、低值化趋势,年总渔获量的66.18%为小型、低值鱼类。
From Febuary,1993 to January,1994,fishes of 5 orders,13 families and 49 species were collected from the Swan Oxbow of Changjiang River where the fish community consisted of riverine and lacustrine types. The Shannon index(H′),Wilhm index,(H″) and Simpson index (D) in Swan Oxbow were 3.70,4.19 and 0.89,respectively. The eveness (E) was 0.66. The annual fish yield was 374530.8 kg in 1993, of which the black carp, grass carp, silver carp and bighead carp account for 17.97% . In Swan Oxbow, overfishing is a major problem, which causes small-sized and low-valued trend of fish community. Small-sized and low-value fish made up 66.18% of the annual yield.
出处
《中国水产科学》
CAS
CSCD
1998年第2期1-5,共5页
Journal of Fishery Sciences of China
基金
国家"八五"科研项目
加拿大国际发展研究中心(IDRC)合作项目
关键词
长江
天鹅洲故道
鱼类群落
种类多样性
Changjiang River, Swan Oxbow, Fish community, Species diversity