http://www.fishinghurts.com/CommercialFishing.asp
Commercial Fishing: How Fish Get From the High Seas to                        Your Supermarket
                     Cruelty to Animals
                     Commercial fishing is cruelty to animals on an almost unimaginable                      scale. Fish look so unlike humans that many people don’t                      realize that they 
feel pain, just                      as we do and lead complex 
intellectual                      lives that rival those of dogs and some other mammals.                      The way that these animals are treated by the commercial fishing                      industry should make animal lovers everywhere give up their                      taste for fish flesh for good. 
                    
                    Today’s commercial fishers use massive ships the size                      of football fields and advanced electronic equipment and satellite                      communications to track fish. These enormous vessels can stay                      out at sea for as long as six months, storing thousands of                      tons of fish onboard in massive freezer compartments. 
                    
                    Commercial fishing has become a big business, and the methods                      used to catch and kill the animals are as cruel as those used                      by factory farmers or slaughterhouse operators. In fact, the                      methods used to kill fish indicate that commercial fishers                      see their prey as no more sentient than rocks on a mountain—and                      the horrible cruelty that they inflict on hundreds of billions                      of fish is completely unregulated.
                    
Yet commercial fishers kill hundreds of billions of animals every year—far more than any other industry—and they’ve decimated our ocean ecosystems. In fact, 90 percent of large fish populations have been exterminated in the past 50 years and a 
recent report published in the academic journal 
Science, estimates that by the year 2048 our oceans will have been completely over-fished.
				   
Lifeless oceans may encourage growth in the fish-farming industry but the FAO is concerned that even fish farming will not be able to meet the demand for fish, since farmed fish need to be fed 5 pounds of commercially-caught fish for every 1 found of fish flesh they produce. 
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Fishing Hurts Fish … and Other Animals, Too
Commercial fishing boats leave their ports in pursuit of specific species of fish, but their hooks and nets bring up thousands of pounds of other marine animals as well. Sharks, sea turtles, birds, seals, whales, and other nontarget fish who get tangled in nets and hooked by long-lines are termed “bycatch” and are thrown overboard. They fall victim to swarming birds or slowly bleed to death in the water. Scientists recently found that nearly 1,000 marine mammals—dolphins, whales, and porpoises—die each day after they are caught in fishing nets. By some estimates, shrimp trawlers discard as much as 85 percent of their catch, making shrimp arguably the most environmentally destructive fish flesh a person can consume.
					                                                 
                                                                          						 
                            “Some were still thrashing; some were too tired;                            many were vomiting up their guts, their eyes bulging                            from the pressure change. Some of these fish may have                            been struggling in the nets for up to 24 hours. After                            a few minutes, their gill arches were slit and they                            were thrown into the next bin, where they twitched and                            gasped, slowly bleeding to death. … It was not                            long before I was covered with fish blood, vomit, and                            guts.” 
                            
—Dawn Carr