A Pretty Bright Black Dragonfish

The black dragonfish ranks right up there with the most repulsive fish in the inky black abyss of the seas.
 But aside from being a hideous abomination, this ugly guppy has some amazing adaptations. Like most of the creatures that call the crushing depths 600 meters (2,000 ft) below the surface home, the black dragonfish has light organs for signaling others of its kind and luring prey.

 It also has light emitters on its belly to help break up its silhouette in case any sensitive eyes are staring up looking for a meal. And it has a gelatinous dermis between the fin rays that it can flash to startle predators.

So it’s a fish that can shine a lot of light from different parts of its body for several purposes. But none of that is as cool as its sniper vision.

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Most fish in the depths can’t see the color red. Red doesn’t travel very far underwater, so most bioluminescence is blue and green. 

The black dragonfish uses those colors, but it also shines red. And since other fish can’t see the red light, it has an invisible flashlight to seek out prey. Incidentally, black dragonfish can’t really see the red, either.

 It has a complicated vision system that uses a derivative of plant chlorophyll to convert the light back into the spectrum the dragonfish can perceive. How a fish figured out how to work plant genetics into its makeup is a question that baffles science.

Masasaurus The Largest Marine Predators

If the Liopleurodon was huge, than Mosasaurus was colossal.
Fossil evidence suggests that Mosasaurus could reach as much as 50 feet (15m) in length, making it one of the largest marine predators of the Cretaceous period.
 Mosasaurus’s head was like that of a crocodile, lined with hundreds of razor sharp teeth which could kill even the most well-armored enemies.

Tanystropheus was a reptile that could reach 20 feet (6m) long

While Tanystropheus was not strictly marine, its diet was mainly fish and scientists think it spent most of its time in the water.
 Tanystropheus was a reptile that could reach 20 feet (6m) long, and it is thought to have been alive during the Triassic period nearly 215 million years ago.

Tylosaurus a species of Mosasaur

Tylosaurus was a species of Mosasaur. It was enormous, reaching more than 50 feet (15m) in length.
The tylosaurus was a meat eater with a very diverse diet. Stomach remains show signs of fish, sharks, smaller mosasaurs, plesiosaurs, and even some flightless birds.
 They lived during the late Cretaceous in the seas that covered North America, where they sat firmly atop the marine food chain for several million years.

Nothosaurus The Aggressive Hunters

Nothosaurus, only about 13 feet (4m) long, were aggressive hunters. They were armed with a mouth full of sharp, outward-pointing teeth, suggesting a diet of squid and fish.

 Nothosaurus is thought to have mainly been an ambush predator, using its sleek reptilian figure to sneak up on prey and take it by surprise.

It’s believed that Nothosaurs were related to pliosaurs, another variety of deep sea predators. Fossil evidence suggests that they lived during the Triassic period over 200 million years ago.

dakosaurus that was discovered in Germany

A Report from listverse
Dakosaurus was first discovered in Germany and, with its odd reptilian-yet-fishy body, was one of the top predators in the sea during the Jurassic period.
Fossil remains have been found across a very widespread distribution, turning up everywhere from England to Russia to Argentina.
 Though it is commonly compared to modern crocs, Dakosaurus could reach a length of 16 feet (5m). Its unique teeth have led scientists to consider it an apex predator during its reign of terror.

Shastasarus the largest marine reptile species ever found

The ichthyosaurs were marine predators that looked like modern dolphins, and could reach a massive size during the Triassic period over 200 million years ago.

Shastasaurus, the largest marine reptile species ever found, was a variety of ichthyosaur that could grow to over 65 feet (20m), much longer than most other predators.

 But one of the largest creatures to ever swim the the sea wasn’t exactly a fearsome predator; Shastasaurus was a specialized suction feeder, eating mainly fish.

The Guinness Book of World Records lists the Mekong giant catfish, weighing up to 660lbs, as the 'world's largest freshwater fish

A stingray weighing nearly 800lb has become the largest freshwater fish ever caught by rod and line.
 The gigantic flat fish, which was 8ft wide and 14ft long, took nearly two hours to reel in.
 It was caught by American TV nature conservationist Jeff Corwin on the Mae Klong river in Thailand earlier this week. 


 

According to the daily mail.

It was so big that several men on board a small fishing boat had to take it in turns to help on the rod.

 After getting the ray alongside the boat it was pulled into a specially-prepared pen where seven people lifted it out of the water so it could be properly measured.
 Specialists measured its width, length and girth to calculate its weight.

The battle to bring this giant fish to the boat was epic and it took many hours and multiple guys rotating off and on the reel. 

'The experience was a true highlight of the series, not only connecting with a record-sized ray but being a part of cutting edge science.'

 Rick Humphries, of UK company Fishsiam, whose fishing guides helped reel in the ray, said:

 'We have caught over 450 different stingrays and our estimations have been proved highly accurate on the rare occasions we have weighed this species.

The larger specimens are always female and quite often pregnant, as was the case with this capture.
 'The latest capture indicates that these stingrays are growing at a fast and healthy rate.'

 It is thought the previous record was held by British angler Ian Welch, who landed a giant stingray weighing between 590lbs and 770lbs in the same river in 2009.

 The Guinness Book of World Records lists the Mekong giant catfish, weighing up to 660lbs, as the 'world's largest freshwater fish'.