'Sea vampires' suck up the blood of their prey

A fisherman could not believe his eyes when he discovered that the lake monster was a rare blood-sucking creature.

The scene shows a rare blood-sucking creature waving in the shallow waters of a lake, only a short distance from the fishermen. Thomas van der Es also found it hard to believe when he first saw a real fighting rockfish in real life.

The creature called the "vampire" of the sea has shown talent in sucking fish blood in the lake.

Scary creatures cling to the victim's torso before draining their blood. Despite the horrible sight, Thomas pulled out his phone and followed a rocky whale circling the lake in Bliesbosh National Park, near Dordarou, Netherlands.

Brave fishermen say that 'sea monsters' are extremely rare and can only be seen every 10 to 20 years.

Initially, Thomas saw a swarm of seagulls flying near the water to find fish.

'They have flown above the strange creature and are trying to catch prey. But fighting fish are too dangerous for them , ' Thomas said.

At that time, Thomas was not sure what the strange creature was but after he contacted RAVON - an organization knowledgeable about the problem - it was determined to be a rockfish.

The rockfish is a fish with no jaws, tubular and parasitic. They date back to ancient times, more than 360 million years ago. The 'vampire' of the sea, thought to be unique to this film, is often found on the Atlantic coast, in Europe, North America, the Western Mediterranean and the Great Lakes.

Thomas believes that the creature he sees also comes from the sea and is heading to a certain river to breed. Scary rock suckers use razor-sharp teeth in their boneless round mouths to grip the host's body and suck blood.

The goal of the rockfish is usually to die of blood loss or infection. After adults, they will return to the rivers to breed, spawn in the water before the adults die.