The blobfish is actually a normal looking fish. It just decompresses when you take it out of extreme depths.
2. Indonesia realized that dead Manta Rays are worth $500 whereas Manta Ray tourism brought in $1,000,000 over the life of a single Ray. Indonesia is now the largest Manta sanctuary.
3. Dolphins sometimes purposefully get themselves pricked by pufferfish to get high.
4. Wild salmon flesh is red because of pigments present in the krill they eat. It is the same pigment that turns lobsters and flamingos red/pink. If this pigment is not supplemented in farmed salmon, their flesh will be the normal grey color as other fishes. This is why farmed salmon is labeled as "color added".
5. The Japanese considered raw salmon dangerous since Pacific salmon was prone to parasites. Norway had too much salmon and decided to focus on teaching Japanese consumers that Atlantic salmon was safe to eat raw. It took 10 years for Salmon sushi/sashimi to finally become popular.
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The use of bowls to house goldfish comes from a misunderstanding of Chinese display vessels. These were small, temporary containers that were used to display goldfish to guests. The goldfishes were otherwise housed in ponds. Fishbowls are so detrimental to goldfish's health that they are prohibited by cities like Rome on the grounds of animal cruelty.
7. Odds of being attacked by a candiru (penis invading fish) are "about the same as being struck by lightning while simultaneously being eaten by a shark."
8. The warm-blooded Atlantic Bluefin Tuna is so powerful that when fighting fisherman it can cook its own flesh with sudden bursts of muscle activity.
9. Some lakes are stocked with fish by dropping hundreds of fish out of an airplane flying over.
10. 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.
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.
12. Crocodile icefish doesn't use blood to transport oxygen, it absorbs oxygen directly from water using its skin
13. Discarded pet goldfishes can grow very large in the wild and they are causing serious environmental problems.
14. 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.
15. A koi fish named Hanako lived for 225 years.
16Electric torpedo fish
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.
17. 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.
18. 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.
19. The largest Blue Marlin ever caught on rod and reel weighed 1,800 lbs, and inside its belly, they found a Yellowfin Tuna that weighed over 155 lbs.
20. Some fishes can climb walls. In April 2015, scientists observed several armored catfishes climbing walls of a cave in Ecuador. It was also the first time scientists found catfishes to have evolved to live in water bodies underground.
The goliath tigerfish is said to be a bigger and deadlier version of the piranha. It has 32 teeth that are of similar size to those of a great white shark. It has been known to attack humans and even crocodiles. It has only ever been caught by a handful of fishermen due to the danger it poses.
22. Some horse owners put goldfish in the water troughs to keep them free of insects like mosquitoes and algae.
23. There are more species of fish found in the Amazon river than they are recorded in the entire Atlantic ocean.
24. There is a fish named Needlefish that can jump from the water and stab people at speeds of up to 37 mph, with multiple human fatalities on record.
25. In 2013, a 500lb bluefin tuna fish was sold in Japan for 1.8 million dollars.