Bycatch adding to the problem of Mass Species Extinction

Bycatch is part of the cause for mass species extinction.  Bycatch is when fisheries catch fish other than the ones that they target.  Many times the bycatch is thrown dead or dying back into the ocean. Greenpeace says that, "In some trawl fisheries for shrimp, the discard may be 90 percent of the catch. Other fisheries kill seabirds, turtles and dolphins, sometimes in huge numbers.
 Latest reports suggest that around eight percent of the total global catch is discarded, but previous estimates indicated that around a quarter of might be thrown overboard. Simply no-one knows how much of a problem this really is."  This means spreading awareness is very important for bycatch.  Often times bycatch goes by unreported.  Many marine animals including birds, die this way.  In fact greenpeace also says, "It has been estimated that a staggering 100 million sharks andrays are caught and discarded each year. Tuna fisheries, which in thepast had high dolphin bycatch levels, are still responsible for the death of many  sharks. An estimated 300,000 cetaceans (whales, dolphins and porpoises) also die as bycatch each year, because they are unable to escape when caught in nets.
Birds dive for the bait planted on long fishing lines, swallow it (hook included) and are pulled underwater and drowned. Around 100,000 albatrosses are killed by longline fisheries every year and because of this, many species are facing extinction.
Bottom trawling is a destructive way of 'strip-mining' the ocean floor, harvesting the species that live there. As well as the target fish species, this also results in bycatch of commercially unattractive animals like starfish and sponges. A single pass of a trawl removes up to 20 percent of the seafloor fauna and flora. The fisheries with the highest levels of bycatch are shrimp fisheries: over 80 percent of a catch may consist of  marine species other than the shrimp being targeted."