Ocean overfishing is simply due to catching wild fish at a much higher rate than that they reproduced. In the last few decades, the total amount of fisheries have increased a lot. Scientists dicovere that the population of many usual food fish has come to 10% of that in pre-industrial period. and that predicted that before 2050, most of the food fish will extinct including tuna, shark, cod.
Overfishing not only have effects on those who were catch but also strongly affect the life of many other sea creatures. Bycatch, a word referring to those fish or marine animal caught by accident with the valuable fish is one of the important reason. Due to some research, the scientists discovered that "Every year, an estimated 300,000 whales, dolphins and porpoises die entangled in fishing nets, along with thousands of critically-endangered sea turtles. Long-line fisheries also kill huge numbers of seabirds. Over 100,000 Albatrosses die this way every year, and many species are endangered as a result of bycatch."
Another big problem caused by the overfishing is the collapse of marine biological system. The loss of biodiversity will cause a collapse of marine environment.
Luckily, human being has awared that the fish population is depleted and many country have limited the time and amount of fishery. In addition, a movement called "Sustanable Sushi" is really popular. This movement start in 2008 in North American that suggest people not to eat those sushi made of endangered marine speices such as wild salmon or blue-fin tuna. Instead, we can eat those can be farmed or not effective in biological system.
Sources:
"Sustainable sushi", seachoice.org, Web, Feb 25th, 2014, http://www.seachoice.org/seafood-recommendations/sustainable-sushi/
Photo arena, Jul 14th, 2013, photograph, Feb 25th 2014,http://www.photosjunction.com/photo/7809.aspx#.Uw102fmSyps
"Overfishing-Plenty of fish in the sea? Not alwayss", National Geographic, Web, Feb 25th, 2014 http://ocean.nationalgeographic.com/ocean/critical-issues-overfishing/
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