Thanks to http://www.audible.com/minuteearth for sponsoring this video. A new fish counting method has revealed there are ten times more fish in the sea than we previously thought.* *But unfortunately, this doesn't mean we're not overfishing.

If you liked this week’s video, we think you might also like these things: Seeing the Sky as Galileo Saw it: http://tdc-www.harvard.edu/software/skypic/rome97.html

We try to leave jargon out of our videos, but if you want to learn more about this topic, here are some handy keywords to get your googling started:

• Milky Way: Earth's home galaxy
• The Malaspina Expedition 2010: A research project to explore ocean biodiversity by recreating the path of a late 18th Century scientific expedition.
• Sonar: A technique that uses soundwaves to map out underwater objects.
• Avoidance of Trawl: A behavior in which fish move out of the way of an incoming net, perhaps through bioluminescent signalling.
• Bioluminescence: Light produced by a living organism.
• Deep water fish: Fish who live more than 500m below the ocean surface in the Mesopelagic, Epipelagic, and Bathypelagic zones. Species featured in this video:
• Stoplight loosejaws (Malacosteus niger)
• Common Fangtooth (Anoplogaster cornuta)
• Lanternfishes or myctophids (Family Myctophidae)
• Bristlemouths (Genus Cyclothone): The most populous vertebrate on Earth.

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• Today I Found Out
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Credits (and Twitter handles): Script Writer: David Goldenberg (@dgoldenberg) Script Editor: Emily Elert (@eelert) Video Illustrator: Ever Salazar (@eversalazar) Video Director: Emily Elert (@eelert) Video Narrator: Emily Elert (@eelert) With Contributions From: Henry Reich, Alex Reich, Kate Yoshida, Omkar Bhagat, Peter Reich, Rachel Becker Music by: Nathaniel Schroeder: http://www.soundcloud.com/drschroeder

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References:

Kaarvedt, S., Staby, A., Aksnes, D.L. (2012). Efficient trawl avoidance by mesopelagic fishes causes large underestimation of their biomass. Marine Ecology Progress Series,456(1-6). Retrieved from http://www.int-res.com/articles/feature/m456p001.pdf

Broad, W. (2015). An Ocean Mystery in the Trillions. New York Times, D1. Retrieved from: http://www.nytimes.com/2015/06/30/science/bristlemouth-ocean-deep-sea-cyclothone.html?_r=0

Xabier Irigoien, T. A. Klevjer, A. Røstad, U. Martinez, G. Boyra, J. L. Acuña, A. Bode, F. Echevarria, J. I. Gonzalez-Gordillo, S. Hernandez-Leon, S. Agusti, D. L. Aksnes, C. M. Duarte & S. Kaartvedt (2014). Large mesopelagic fishes biomass and trophic efficiency in the open ocean. Nature Communications, 5, 3271. Retrieved from http://www.nature.com/ncomms/2014/140207/ncomms4271/full/ncomms4271.html

Kaarvedt, S. (2016). Personal Communication.

Duarte, C. (2016). Personal Communication.