26Sushi tuna
In 2013, a genetic test of fish in restaurants and supermarkets showed 84% of Sushi restaurants in the US mislabeled and replaced tuna with Escolar, a fish known to cause prolonged, uncontrollable oily anal leakage.
27. Despite the stereotype of a very short life, with proper care, an average goldfish can live up to 10 years as pets, and over 25 years in the wild. The longest recorded lifespan for a goldfish was 43 years.
28. Doctors in Ancient Rome used an early form of electrotherapy to successfully treat neurological conditions such as epilepsy and migraines. They administered the charges by placing electric torpedo fish on the patient's head.
29. A koi fish named Hanako lived for 225 years.
30. Sardine isn't actually a species of fish but rather a generic name given to various small, oily fishes within the herring family of Clupeidae.
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31Discarded pet goldfish
Discarded pet goldfishes can grow very large in the wild and they are causing serious environmental problems.
32. Crocodile icefish doesn't use blood to transport oxygen, it absorbs oxygen directly from water using its skin
33. In 2014, during the Super Bowl and Puppy Bowl, Nat Geo Wild showed the "Fish Bowl", a 4-hour clip of a goldfish swimming in a bowl.
34. At birth, Halibut have an eye on each side of the head and swim like a salmon. After 6 months, one eye migrates to the other side, making them look more like flounder. At the same time, the stationary-eyed side darkens to match the top side, while the other side remains white.
35. Some lakes are stocked with fish by dropping hundreds of fish out of an airplane flying over.
