Species and habitats - Merlangius merlangus- Age 0 - Recurrence, (CGFS 1988-2...

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）状况可依据种群密度水平及随时间的变异性，划分为稀有（rare）、偶见（occasional）、常见（frequent）与频发（recurrent）四类。