peripheral In ichthyology, the peripheral division refers to fishes that occur in freshwater but which are very tolerant to salt water, e.g.

• 周缘性的在鱼类学止，周边区域参考依据为出现在淡水的鱼，但是对咸水域有非常大的容忍力，例如七鳃鳗科、鲟科、鳗科，鰕虎鱼科等。