All organisms pictured above were caught and killed as by-catch by commercial fishermen off the coast of California. These fishermen were using drift gill-nets--mesh nets that can reach one mile in length--to catch sword fish.
As estimated by Geoff Shester, the California Program Director for Oceana, one marine mammal dies for every five swordfish caught. These marine mammals--as well as other marine organisms such as sharks, rays, and turtles--die of either suffocation or intense wounds caused by the nets.
The use of drift gill-nets has been outlawed in California State Waters for over 20 years; however, fishermen who specifically target sword fish are allowed to fish with few restrictions. This basically means that they receive special privileges--one being the fact that they are allowed to use drift nets.
Oceana--an organization promoting marine conservation--supported the legislation to completely ban the use of gill-nets in Californian waters. Unfortunately, those supporting the ban lost their chance to protect marine organisms by one vote.
A friendly tip to those of you who enjoy seafood: please stop eating swordfish--especially if you know that the animal was caught through the use of gill-nets. If you ask a waiter or butcher where they purchase their fish from, they should be able to give an answer (even if they have to ask a manager). If it was caught in California, there may be a good chance that gill-nets were used.
Photos collected from NOAA.
Information from Brian Epstein's article on PBS.