Discus are some of the most unusual and most expensive fish commonly seen in pet stores. These Amazonian cichlids get their name from their flattened, round shape. Discus come in dozens of varieties, most of which have neon red, blue, or yellow spangling.
The Batfish – Clowns of the Sea
Have you ever wondered to yourself “What is the friendliest fish in the ocean?” Well, wonder no more! The answer to this question is actually quite obvious, it's the ever so curious batfish.
Some of the easiest fish to take care of include white cloud minnows, cherry barbs, goldfish, guppies, neon tetras, and cory catfish. All of these species are relatively peaceful, non-demanding fish that do well in a beginning fish tank.
Groupers are not the only fish that enjoy being petted, it seems. According to videos on YouTube, other species of fish that appear to like the interaction include koi, cichlid and discus fish.
Salmon, trout and herring are considered low in mercury and high in brain-boosting DHA. Other types of seafood considered "best choices" include shrimp, cod, catfish, crab, scallops, pollock, tilapia, whitefish, trout, perch, flounder, sole, sardine, anchovy, crawfish, clams, oyster, and lobster.
The origin of the loneliest fish species in the world has been established by biological scientists. The Devil's Hole pupfish is a species of fish that exists literally in only one place in the whole world- a 3 by 6 metre open air pool in the heart of the Mojave desert.
Most homeowners want a Platinum Arowana in their aquarium, but they are rare. Also, this fish is endangered, hence the high purchase cost and insurance. The Arowana is kept mainly by the Asian because they believe that it chases away bad luck.
#1 Platinum Arowana
The Platinum, also popularly known as the Asian Arowana or Scleropages formosus, sometimes incorrectly referred to as a Dragon Fish, it sells for up to $400,000, making it far and away the most expensive fish that can be bought for an aquarium.
Sooty grunter are pound for pound the hardest fighting freshwater fish in the north of Australia - probably all of Australia.
The cabezon (Scorpaenichthys marmoratus) is a unique fish living on the Pacific coast. Generally found near the ocean floor, the cabezon is known for being stubborn because of its temperament and its ability to remain nearly motionless until its next meal.
Arapaima gigas is a large Amazonian fish (weighing up to 150 kg) living primarily in seasonal lakes infested with ferocious piranhas.
Sooty Grunter are a tropical freshwater species present in Queensland and the Northern Territory. Sooty Grunter are fiercely aggressive and dirty fighters that are arguably one of Australia's most powerful fish. Pound for pound, these tropical terrors would pull almost any fish backwards!
No list of deadly fish would be complete without the great white shark. Great white sharks are the most notorious sharks and are responsible for the highest number of unprovoked attacks on record. With around 300 teeth and an estimated bite force of around 18,000 newtons, the great white is a fierce predator.
Given that many shark species need to keep swimming to breathe, you wouldn't think them lazy, but the nurse shark is a different matter. They don't migrate like many species and spend most of their time lying motionless on the seabed, an activity made possible by the fact they can actively pump water over their gills.
The lionfish's spines deliver a venomous sting that can cause extreme pain, sweating, respiratory distress, and even paralysis. So unless you're an expert, don't touch them. If you are unlucky enough to get stung by a lionfish, seek immediate medical attention.
Infants 6 months and older can eat 1 to 2 servings a week of a variety of fish that are lowest in mercury. The serving size is 1 ounce.
Experts recommend children 1 to 3 years old get two to three 1-ounce servings of the "best fish" each week, and just one serving of "good fish'' each week. For example, salmon is considered "best" and can be given to your baby multiple times a week, since it has very low levels of mercury.
Researchers have found that fish recognize each other and gather information by eavesdropping. They're capable of remembering past social interactions that they've had with other fish, and they show affection by rubbing against each other.