Species and habitats - Clupea harengus - Age 0 - Recurrence - IBTS Q3 (1991-2010)
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Species habitat occupation, observed during the third quarter IBTS from 1980 to 2010, has been expressed as rare, occasional, frequent, recurrent depending on density levels and variability over time.
1980年至2010年各年度第三季度国际底拖网调查（IBTS）所观测得到的物种栖息地占用情况，依据种群密度水平及随时间的波动特征，被划分为罕见、偶见、常见与周期性出现四类。
