Harbour porpoises, what do they eat?

This video is called Harbour porpoise (Phocoena phocoena).

Dutch biologist Mardik Leopold recently investigated what harbour porpoises eat. He found out (translated):

To find out, he studied the stomach contents of 829 porpoises that had washed up between 2005 and 2014 on the Dutch coast.

…

In the stomachs Leopold found some seventy different prey species. Four types of prey are really important: gobies, cod species, sand eels and herring species. The staple food of young porpoises consists mainly of gobies, says Leopold. “As they get older and bigger they need bigger fish such as whiting and fatter fish such as herring, sprat and sandeel.”

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