In some areas, like the Okinawa islands, damselfish engage in extensive weeding and maintain a monoculture of red algae in their beds. In others, like Mauritius, they maintain a mixed crop bed, weeding out only invasive plants.
The giant grouper, also known as the Atlantic goliath grouper, is one of the largest grouper fish that reside in shallow waters. Being a carnivore they mostly prey on animals, but there have been numerous reports of these massive fish attacking divers in their territory.
Fisherman prefer to fish anchovies on nights with a full moon: with their silvery body they shine in the water under the moonlight.
In its lifetime, a flounder fish undergoes unusual transformation in its structure. When the egg hatches, like most other fish, it has eyes on both sides of its head. After a few days, it begins to lean to one side, and the eye on the opposite side migrates to the side to which it leans. In this way, the side that has both eyes becomes the top of the fish, and the eyeless side starts fading and becomes the bottom.
When sea lions grow older, they become prone to pneumonia, epilepsy, and cancer.
French angelfish are very rarely—if ever—alone. They form close, monogamous pairs from a young age and then do everything with their mate for the rest of their lives. They live, travel and hunt in pairs and will even defend their ocean territory against neighboring pairs of fish.
As the largest animal on earth, the full-grown blue whale is so heavy, just its tongue can weigh more than an entire elephant- that means that it can be heavier than 7,000 kilograms (15,432 lbs)!
Dolphins find natural ways to get high. They use pufferfish to get this effect, and sometimes even do it in groups.
The digestive system of sea cucumbers cleans the ocean, a sea cucumbers' diet consists of anything that sticks to sand at the bottom of the ocean. After they have gotten food out, they poop the sand out clean and tidy.
Wild axolotls are rarely white, while you might see plenty of white ones in captivity, the animal is normally greenish brown or black. White ones are known as "leucistic" and descend from a mutant male that was shipped to Paris in 1863. They were then specially bred to be white with black eyes (different from albinos, which generally have red eyes).