Marine water has oxygen in it, but it can run out! Marine hypoxia often occurs when humans pollute the water; some animals can swim away like fish, but slow-moving animals, like sea urchins, are not able to move fast enough. Help our hero sergeant major fish escape the oxygen-poor water and save his friends from danger, while not getting eaten by its predators!

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We greatly appreciate and acknowledge the support of our donors: the Smithsonian Women’s Committee, the U.S. Embassy in Panama, and the National Science Foundation.

This material is based upon work supported by the National Science Foundation under Grant No. BIO-OCE-2048955, OCE-1924220. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.