Damage to oceans including ocean acidification, along with temperature changes and increases of nutrients from sewage and fertiliser run off, it is causing significant changes in ocean ecology.

This is a ‘summay’, a powerful video looking at consequential changes of damage to the oceans, in this case rising jelly fish population. They are extremely efficient at hoovering up the young of other species, both for food and to reduce their predators. They are very robust with multiple reproductive mechanisms.

Stung is not related to this video, but an understandable and sobering book on the potential impacts of damage to the Oceans including significant growths in jelly fish populations.

Stung! On Jellyfish Blooms and the Future of the Ocean

http://www.nybooks.com/articles/archives/2013/sep/26/jellyfish-theyre-taking-over/

Gershwin, Lisa-ann (2013-05-07). Stung!: On Jellyfish Blooms and the Future of the Ocean (Kindle Locations 5744-5745). University of Chicago Press. Kindle Edition.