However, in the late 80's and early 90's the scale of salmon research in Russia increased significantly and a comprehensive study of the Pacific salmon's marine life has began.
1) 80s/90s - at the beginning of the sentence?
2) Increased and Has began - correct tenses?
3) The Pacific salmon's marine life - how about this?
However, in the late 80's and early 90's the scale of salmon research in Russia increased significantly and a comprehensive study of the Pacific salmon's marine life has began . 1) 80s/90s - at the beginning of the sentence? It's OK as written above.
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However, in the late 80's and early 90's the scale of salmon research in Russia increased significantly and a comprehensive study of the Pacific salmon's marine life has began.
1) 80s/90s - at the begin