Subscribe - it's FREE! - http://goo.gl/EpIDGd And please support us on Patreon - https://goo.gl/ZVgLQZ MinuteEarth is available as a free iTunes podcast! - http://podcast.minuteearth.com/ We're also on facebook - http://facebook.com/minuteearth And twitter - http://twitter.com/MinuteEarth REFERENCES Morato, T., R. Watson, T.J. Pitcher and D. Pauly. 2006. Fishing down the deep. Fish and Fisheries 7(1): 23-33. Norse, E. A., et al. 2012. Sustainability of deep-sea fisheries. Marine Policy 36(2): 307-320. Air Bladder http://www.britannica.com/EBchecked/topic/577044/swim-bladder MinuteEarth provides an energetic and entertaining view of trends in earth's environment -- in just a few minutes! Created by Henry Reich, with Alex Reich, Peter Reich, Emily Elert, and Ever Salazar. Music by Nathaniel Schroeder: http://www.soundcloud.com/drschroeder