The river and the nutrients it brings also support the world’s biggest inland fishery, accounting for a quarter of the global freshwater catch, feeding tens of millions of people.

【翻译】该河流及其所带来的营养物，也支持了世界上最大的内陆渔业，占全球淡水捕捞量的四分之一，养育了数千万人。

【结构分析】

1. accounting for a quarter of the global freshwater catch, 现在分词短语作定语修饰the world’s biggest inland fishery（世界上最大的内陆渔业）。

2. feeding tens of millions of people，现在分词短语作结果状语，修饰谓语动词support，其逻辑主语为The river and the nutrients。