About a hundred mackerel swimming with open mouths and almost right at the surface. During Saturday afternoon, Michael Kleber saw a great landmark hour in Örsviken when he was out in Billdal. He was standing on a jumping tower when he got the mackerel hour on film.

- I've seen mackerel hours before, but not this late in the year. It has been during the summer. This stem was also very many mackerel and large, says Michael Kleber.

See the fish in the clip above!

"I've seen mackerel hours before but not this late in the year" Photo: Michael Kleber

Plows after plankton

He went down to the same place on Sunday too, when he saw several shoals but not as close as Saturday.

- Now it is actually a shoal but with smaller mackerel. I would guess that they plow for plankton because they had their mouths open. It's incredibly exciting. If you are the least geeky you will loose on this, I am.

Marine biologist: "Not uncommon"

Björn Källström, marine biologist at the Gothenburg Marine Biological Laboratory, says it is not unusual for them to swim near the edge after plankton.

- If they swim with open mouths and near the surface, they look for plankton. Then they don't care about our hooks. Many have made that observation. If it's unusual for the season, I don't really know, says Björn Källström.