Damaged Food Chains

In many websites I've come across it has been predicted that most global fisheries will collapse by 2050 and in effect, most fish will become endangered or extinct.  The thought of this is overwhelming; visualizing Earth's largest ecosystem being annihilated is appalling.  Today, large commercial companies over fish predator fish and sharks-- massively disrupting the food chain they uphold.  This is because without any predators to limit the amount of smaller fish, they overpopulate, eat too much, don't have enough food, then begin to starve.  In fact, according to an article written by Mercedes Lee and Carl Safina, when a animal's population is severely endangered, the species is unable to "full fill its role as prey, predator, or competitor".  This usually gives other species the ability to become more superior in the food chain and take the previous species' place. The occurrence of these kind of events would lead to a prominent impact on the diet of people who rely on fish as their main source of food, especially in developing countries and coastal areas.  In addition, it would also signify that the price of freshwater fish would skyrocket-- considering they're still around.  So when will there be a limit set on over fishing?  How badly will our oceans be exploited before action is taken in preventing the serious effects?