Recent research had shown that fish recognised individual "shoal mates", social prestige and even tracked relationships.
最近的研究表明鱼可以识别各自的“鱼群伙伴”、社会威望，甚至相关的人际关系。
Biologists speculate that the mostly likely cause was a shift in Pacific Ocean currents, but food availability, changing river conditions and predator-prey relationships could be affecting the fish.
生物学家推测，最有可能的成因是太平洋洋流的变化，不过食物的取得、河流环境的改变、生物掠夺关系等，也都可能对鲑鱼造成影响。
The good relationships between the structure of fish gills and their function were discussed.
本文还讨论了剑尾鱼鳃结构与其功能的密切关系。
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