Describing the migration of certain fish, such as salmon, that spend most of their lives in oceanic waters before travelling to breed in the upper reaches of rivers and streams. Compare katadromous.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。