Over fishing will eventually deplete (do away with) any fish species.Once a species is gone it is gone. Natural predators will have to rely on other food sources for their survival. The cost of food products that contain fish will go up in price. Over fishing any fish population will affect the ecosystem of any body of water and not in a good way.
In 2004, the US Commission on Ocean Policy reported that "25% to 30% of the world's major fish stocks are over exploited and that US fisheries are experiencing similar difficulties. Of the nation's 267 major fish stocks ... roughly 20% are either already over fished, experiencing overfishing, or approaching an over fished condition." Limits on commercial fishing need to be set for the health of the oceans.
In 2005, a study by the Food and Agriculture Organization of the United Nations found that global stocks of most fish are stretched to their limits. Nearly a quarter of commercial species have already been over-exploited, with a total 70% of species now being fished close to, at, or beyond their capacity.