The most likely cause of fish eyes popping when they die is a condition called “Popeye.” So, why would an aquarium fish die with its eyes popping out? Popeye Generally, it’s game fish such as crappies, large-mouth bass, and walleyes that are affected by barotrauma. An expanded swim bladder that causes the fish’s stomach to be pushed right out of its mouth.However, several indicators can be seen clearly by the naked eye, including: The internal symptoms of barotrauma are not visible to anglers. That’s why many Fish and Wildlife Service authorities prohibit catch-and-release fishing in lakes beyond a certain depth. In fact, some fish appear completely unharmed and swim away with no problem, only to die later. Unfortunately, barotrauma usually causes death in fish immediately or very soon after the fish is released. The condition can cause several injuries, including hemorrhaging of the fish’s internal organs, prolapse, torsion, hematomas, loss of vision, and bulging eyes. What Is Barotrauma?ĭeepwater-dwelling fish species suffering from a condition called “barotrauma” often die with bulging eyes.īarotrauma is generally seen in fish landed by anglers fishing in deep water and is caused by rapid changes in barometric pressure. Keep reading to learn why some fish’s eyes pop out when they die.
In fact, that’s a pretty unusual phenomenon that’s linked to a specific disease or situation. The first thing to understand is that not all fish eyes pop out when they die. But sometimes, a fish’s eyes bulge out of its head in death. Losing one of your favorite pet fish can be very upsetting, especially if the cause of death isn’t obvious.
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