Species and habitats - Merlangius merlangus- Age 1+ - Recurrence, (CGFS 1988-2009)
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Species habitat occupation has been expressed as rare, occasional, frequent, recurrent depending on density levels and variability over time.
物种栖息地占用（Species habitat occupation）可依据其密度水平与时间维度上的变异性，被划分为稀有、偶见、常见与频发四个等级
