Posts Tagged herring

Jan 10 2014

They’re back – the bay’s herring hordes return

Sea lions, porpoises and tens of thousands of birds are jockeying for position with fishermen this week as the annual herring run splashes into San Francisco Bay, a spectacular marine wildlife showcase that conservationists say is one of the largest in North America.

The schools of herring, which surge into the bay in several waves, have attracted as many as 70,000 birds to the region, particularly to Richardson Bay in Marin County, a spawning hot spot for the squiggling hordes.

The fish arrived en masse beginning last week to lay and fertilize eggs, or roe – a delicacy for a wide variety of species, including sushi-loving humans. Fishermen are rushing out every morning to cast their nets before the menagerie of honking, squawking ducks, pelicans and diving birds can devour all the good stuff.

“We’re the last predators to get a crack at those fish. Everyone else has come to the table, and we get the leftovers,” said Nick Sohrakoff, a herring fisherman and chairman of the local herring advisory committee. “There’s a lot of fish in the bay, and they seem this year to be a little bit bigger than they were in the past few years.”

The riotous reception is a good sign that the bay’s once-thriving herring runs, which collapsed four years ago, are returning to glory. The San Francisco run – the last urban fishery in the United States – is the only big-time fishing operation where spectators can actually sit on shore and watch commercial boats haul in the catch.

Read the full article here.

628x471

Oct 24 2012

Silvery fish bend a law of physics

Silvery fish such as herring, sardine and sprat are “breaking” the basic physics law of reflection, according to a study from the University of Bristol published this week in Nature Photonics.

Silvery fish. (Photo: Monterey Bay Aquarium/Rick Browne)

Reflective surfaces polarize light, but PhD student Tom Jordan and his supervisors Professor Julian Partridge and Dr Nicholas Roberts in Bristol’s School of Biological Sciences have discovered that these silvery fish have defeated this basic law of reflection, which helps protect them from predators.

Until now, it was believed that the fish’s skin, which contains “multilayer” arrangements of reflective guanine crystals, would fully polarize light when reflected, thereby reducing reflectivity and making them more visible to predators.

Full story here.