Here's some ferocious fish are threatened with extinction due to begin human and polluted environment. Ferocious fish threatened with extinction include:
Bluntnose Sixgill
The Bluntnose Sixgill shark is a primitive, common, and distinctive shark that has six gills on each side of the body (most sharks have five pairs on each side of the face). These sharks are also known as the Cow shark, the Grey shark, the mud shark and the Bulldog shark. They have a single (and small) dorsal fin near the end of the body, a blunt snout, and small eyes in front of the mouth.
They are gray-brown in color and are paler underneath. It has a toxic liver but edible flesh. It is fished by man for its oil and meat. The Bluntnose Sixgill shark is not dangerous (unless provoked). The Bluntnose Sixgill shark averages about 16 ft (4.8 m) long. It ranges from 5 to 16.5 ft (1.5 to 5 m) long. The Bluntnose Sixgill shark has six rows of saw-like teeth positioned in the side of the lower jaw. The upper jaw has smaller, curved, single-cusped teeth.
Fishzilla
These fish can live in poor environmental conditions, aided by their ability to breathe air and can travel overland. This predatory fish like fish in general have pectoral fins. Remarkably, these fish can climb a tree. This fish has a head like a dragon, complete with wide eyes and pointy fangs. Fish types of cork is even like to drink blood and can have up to one meter long.
Saw Fish
Sawfishes belong to a group of fishes called elasmobranchs that includes sharks, rays, and skates. All Elasmobranchs have a skeleton made of cartilage as opposed to a skeleton made of bone like other fishes such as red drum, snook, or tarpon. Sawfishes are actually a type of ray. Sawfishes all fit into one family known as Pristidae, derived from a Greek term meaning "saw". Sawfishes possess the characteristic long, flattened, toothed saw, a flattened head and trunk, and a shark-like appearance and manner of swimming. Once lost, the teeth along the saw are not replaced. Sawfishes worldwide are poorly studied and no one knows for sure the number of living species, but there are an estimated four to seven species worldwide. The two species that exist in the western side of the Atlantic Ocean are the smalltooth sawfish (Pristis pectinata) and the largetooth sawfish (Pristis perotteti). The two species can look very similar, but can be distinguished by counting the saw teeth on either side of the saw. The smalltooth sawfish usually has 23-34 teeth per side and the largetooth sawfish usually has 17-22 teeth per side. The ranges of both species have been reported to include Florida, but only three specimens of the largetooth sawfish have ever been reported from Florida. The typical range of the largetooth sawfish is further south and west of the state. The smalltooth sawfish is by far the most often reported species of sawfish on both coasts of Florida. Hundreds of specimens have historically been reported throughout Florida, but in the last decade or so most have been reported from southwest Florida.
Giant Stingray
The giant stingray is one of the world's largest freshwater fish, but it's also cloaked in mystery. No one is sure how many giant stingrays are left, which habitats they prefer, or even if they ever venture into the ocean, where their more commonly known relatives dwell. Giant stingrays are known to prowl river systems in Thailand, Borneo, New Guinea, and northern Australia. They often bury themselves in sandy or silted river bottoms and breathe through holes, or spiracles, located on top of their bodies. Stingrays locate prey, usually clams and crabs, with a sensor that can detect an animal's electrical field. These ancient fish, little changed over many millions of years, can reach 16.5 feet 5 meters long and weigh up to 1,320 pounds 600 kilograms. They are brown to gray in color, wide and flat in form, and they sport a long, whiplike tail.
Barracuda
The barracuda is any of about 20 species of predatory fishes of the family Sphyraenidae (order Perciformes). Barracudas are usually found in warm, tropical regions; some also in more temperate areas. Nocturnal creatures, they are swift and powerful, small scaled, slender in form, with two well-separated dorsal fins, a jutting lower jaw, and a large mouth with many sharp large teeth. Size varies from rather small to as large as 4-6 feet (1.2-1.8 meters) in the great barracuda (Sphyraena barracuda) of the Atlantic, Caribbean, and the Pacific. Barracudas are bold and inquisitive, and fearsome fishes, that may be dangerous to humans. The great barracuda is known to have been involved in attacks on swimmers. In Hawai'i, they have been known to inhabit open waters and bay areas in the shadows, under floating objects. To avoid them, don't wear shiny objects. They are attracted to shiny, reflective things that look like dinner. They cause harm with their sharp jagged teeth and strong tearing jaws; slashing and creating jagged tears in your skin.
Ganges Shark ( India )
Ganges Shark is an endangered species of riquiem shark found in the Ganges River of India. The Ganges river shark is considered to be "critically endangered." What about the other river sharks? Because most river sharks are not well known, we don’t know if their populations are getting bigger or smaller. We do know that animals with limited ranges (rivers for example) can be easily disturbed if humans take too many fish or don’t pay attention to how their home.
ORCA ( Killer Whales )
Killer Whale or Orca (Orcinus orca) is the largest species of the dolphin family. This species is found in all oceans, from cold regions such as Atlantic and Antarctica to the warm temperate region. Orca can be found in almost all oceans of the world, but most Orcas live in cold regions and have characteristic black and white on the bodice.
Killer whales are top predators in the ocean, most of the population ate fish, while other populations consuming marine mammals like sea lions, seals, walruses to large whales. Orca can grow to about 27-33 feet (8-10 m) long, weighing more than 8.000 to 12.000 pounds (3.600 to 5.400 kg). Orca males larger than females. They are the largest member of the dolphin family. Killer whales are efficient hunters that eat a very varied diet of fish, squid, sharks, marine mammals (including whales and seals), turtles, octopi, and birds (penguins and gulls). They have even been known to attack young blue whales and other large whales. They have 10-13 pairs of large, each cone, tooth enamel is distributed in both upper and lower jaws (for a total of 20-26 pairs, so the orca has 40-52 teeth).
