Barotrauma is the technical term describing an injury caused by a change in air pressure, typically affecting the ear or the lung. With fish, it can usually be seen as bulging eyes and the stomach coming out of its mouth. This is caused by an expanding air bladder which was not decompressed. Simply throwing the fish back into the water will kill it because the air bladder will not decompress on its own. If you and your group seem to catch a lot of rockfish, consider moving to another area. This is the best way to protect rockfish from experiencing barotrauma.
http://www.seastarsportfishing.info/how-should-a-rockfish-be-properly-released/
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