Question

where did the marine life most affected by the extinction live

Answer 1

By the extinction life the marine life was most affected in the seas.

Answer 2

It has been recently reported that the populations of locally and commercially available species of fishes have been reduced to fifty percent, and some even more, some are on the verge of extinction.

Particularly, the tuna and mackerel populations have seen a nearly 75% decline and Bluefin tuna in the Pacific are on the verge of extinction.

The root cause of this is largely due to the global practice of overfishing.