Tad, Cambridge asked:
I recently heard a statistic quoted on a TV program which concerned me, but I havenít been able to confirm itís accuracy. They said that 90% of all big fish in the sea have disappeared in the last 40 years. This could be reversed if fish stocks are left to recover, provided certain fish have not become extinct. Is this simply down to over fishing, or is there a different explanation , such as global warming?
We have had declines up to 90% of some fish, and overfishing seems to be the main culprit. Whether or not fish stocks can recover is a different matter, we may have altered the marine ecosystem so much that recovery might not be possible.