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The deaths have left the authorities puzzled after first washing ashore last Thursday.

In bizarre footage posted by German publication Focus, a blanket of dead fish is seen covering 150 square meters of the harbour in the small town of Mecklenburg-Vorpommern.

Birds appear to pick at the growing pile of the decapitated fish, while specialists appear to scoop some out of the water.

Many of the different sized fish are missing their heads while nearly all appear to have had their bladders torn out.

Ongoing investigations are taking place with the nature conservation authorities, veterinary authorities and the environmental agency.

The headless carcasses are now being fished out of the water by boats as they try to get to the bottom of the phenomenon.

Investigations have seen officials withdraw fish and water samples.

Tyler Glockner – of YouTube channel secureteam10 – shared the video and offered his own thoughts.

He revealed how experts said the fish heads looked like the result of "partially mechanical effects".

(Image: ONLINE FOCUS)

The claim has spun conspiracists into believing something mechanical had done this to the creatures.

One viewer asked a wacky question: “I wonder what aliens do for fun?”

Many others replied, one claiming: “They cut the heads off of fish and juggle them.”

Another said: “Chop the heads off fish? Duh.”

One viewers blamed a fishing company, claiming “they had a batch of fish go bad.”