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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