Many people across the world rely on fish or fish-derived goods for their dietary and economic survival. The seas and freshwater waters of the Earth are home to over 30,000 distinct species. Many fish species have their beauty highlighted in fish stores, aquariums, and personal collections. Some animals, on the other hand, have a darker, more scary side. When handled carelessly or improperly prepared for food, a few of them may assault humans, while others may give a dosage of poison. Some species are demonised because of their startling appearance or their violent reputation in folklore and myth; nevertheless, one species, despite its cuteness and small size, poses a direct threat to bathers.

3). Stonefish

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Stonefish are venomous marine fish found in shallow seas of the tropical Indo-Pacific, belonging to the genus Synanceja and the family Synancejidae. They are lethargic, bottom-dwelling fish that reside in mud flats and estuaries, amid rocks or coral. Thickset fish with huge heads and mouths, small eyes, and rough skin covered with wartlike bumps and, occasionally, fleshy flaps, they lie motionless on the bottom, practically identical in form and colour to their environment. They are a hazardous kind of fish. They may shoot large amounts of venom through grooves in their dorsal-fin spines when trodden on, despite being difficult to perceive. These fish’s wounds are excruciatingly painful and occasionally lethal. A few more strong, warty fish species belong to the Synancejidae family. They are poisonous as well, albeit not as well-known as the stonefish.

2). Atlantic Manta

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Manta rays, often known as devil rays, are a group of marine rays that belong to the Mobulidae family (class Selachii). Manta rays have fleshy expanded pectoral fins that seem like wings, and extensions of those fins extend as cephalic fins from the front of the head, looking like devil’s horns. Manta rays have short whiplike tails with one or more stinging spines in some species.

Manta rays, which are linked to sharks and skates, live in warm seas along the coasts of continents and islands. They swim near the surface, flailing their pectoral fins and occasionally leaping or somersaulting out of the water to push themselves. They eat plankton and tiny fish that they catch with their cephalic fins and sweep into their mouths.
The tiniest manta ray, Australia’s Mobula diabolis, is just 60 cm (2 feet) broad, but the Atlantic manta, or gigantic devil ray (Manta birostris), is the biggest of the family, growing to more than 7 metres (23 feet) wide. The Atlantic manta is a well-known species with a brown or black coloration and a robust yet non-aggressive appearance. Contrary to popular belief, it does not engulf and consume pearl divers.

1). Electric Eel

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The electric eel (Electrophorus electricus) is a long South American fish that stuns its victim, mainly other fish, with a severe electric shock. The electric eel is a long, cylindrical, scaleless, gray-brown eel that may grow to 2.75 metres (9 feet) in length and weigh 22 kilogrammes (48.5 pounds). The tail area accounts for around four-fifths of the total length of the electric eel, and it is bordered on the underside by an undulating anal fin that propels the fish. It is not a real eel, but rather a member of the characin fish family, which includes piranhas and neon tetras. The electric eel is one of the most important aquatic predators in the varzea, a whitewater flooded forest. Electric eels made up more than 70% of the fish biomass in one fish survey of a typical varzea.

The electric eel is a slow-moving freshwater species that comes to the surface every few minutes to breathe. The electric eel’s mouth is lined with blood arteries, allowing it to function like a lung.
It’s possible that the electric eel’s proclivity for shocking its food developed to shield its delicate mouth from harm from struggling, typically spiny, fish. The startled prey is stunned long enough to be swallowed directly into the stomach through the mouth. Occasionally, the electric eel does not try to stun its target, instead gulping them down faster than they can respond. The eel’s electrical discharges may be employed to prevent prey from fleeing or to cause concealed prey to twitch, causing the prey to expose its location. The electric organs, which are produced from muscle tissue enervated by spinal nerves, are located in the tail area and produce a charge of 300–650 volts, which is strong enough to shock humans. These organs might possibly be utilised to aid navigation and communication amongst electric eels.

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