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利用南极海洋生物资源养护委员会(CCAMLR)提供的数据,结合Fishbase所提供的相关鱼种营养级,分析了1970—2009年南大洋有鳍鱼类渔业的平均营养级(TLi)变动情况。结果表明:南大洋有鳍鱼类渔业TLi趋势较为明显,可分为1970—1991、1992—2009年两个阶段;1970—1991年,TLi处于较低的水平(3.23~3.60),整体上呈下降趋势;1992—2009年,TLi明显处于一个较高的水平(3.82~4.02);渔获平均渐进体长的变化趋势与平均营养级基本上保持一致;1970年的渔业均衡指数(FiB)最高,1997年之后FiB指数基本上处于稳定状态。
Based on the data provided by the CCAMLR and the relative species trophic levels provided by Fishbase, changes in the average trophic level (TLi) of the finfish fisheries in the Southern Ocean from 1970 to 2009 were analyzed. The results show that there are obvious TLi trends in the finned fish fisheries in the Southern Ocean. They can be divided into two stages from 1970 to 1991 and from 1992 to 2009. From 1970 to 1991, TLi was at a relatively low level (3.23-3.60) The trend of TLI was basically at a higher level (3.82 ~ 4.02) from 1992 to 2009; the change tendency of the average asymptotic body length of catch was basically the same with the average trophic level; and the highest FIB of 1970 FiB index is basically stable after 1997.