摘要
通过1982 、1993 年和1998 年春季在莱州湾基本相同站位的底拖网渔业生物调查,分析了生殖群体的生物量、渔获物组成及生物多样性的年间变化。结果表明,生物量呈大幅度下降趋势,1998 年分别为1982 年和1993 年的2 ．8 ％和11 ．0％ ,特别是鳀鱼、黄鲫和枪乌贼等小型中上层生物资源生殖群体的下降严重影响资源补充量。虽然现存生物量处于非常低的水平,但生物多样性1998 年有所增加,表明了资源优势种不明显、优势度下降。
Bottom trawl surveys of the Laizhou Bay fishery resources in 1982,1993 and 1998 were carried out. The analysis of biomass, species composition and deversity of fishery resources are analyzed . The results indicated that the biomass dramatically declined in 1998 and was only 2.8% and 11.0% of that in 1982 and 1993, respectively. Particularly, the low level of spawning stock of Japanese anchovy, half-fin anchovy and squid will very adversely affect their recruitment. Although the standing stocks are in a very low level ,the species diversity indices show increase in 1998,indicating a decrease of species dominance.
出处
《海洋水产研究》
CSCD
1999年第1期6-12,共7页
Marine Fisheries Research
基金
国家自然科学基金
关键词
渔业资源
生物多样性
莱州湾
Fishery resource Biodiversity Laizhou Bay
