This photo circa 1980 in British Columbia gives an idea of the extent of the commercial herring fishery
Photo Credit: Rod Innes

Study links herring decline to commercial fishing

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For thousands of years it was a tiny fish, herring, not just the iconic Pacific salmon, that sustained indigenous peoples all along the North American west coast.

A new study shows the archeological record presenting a much different picture of that historic herring population throughout the region, than is the case now.

Dana Lepofsky (PhD) is a co-author of the report. She is a professor in the Department of Archeology at Simon Fraser University in British Columbia and a coordinator of the university’s Herring School.  She is also with the Hakai Network for Coastal People, Ecosystems and Management.

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The study involved researchers from a number of institutions both in Canada and the US, along with historical knowledge from indigenous people all along the west coast, and from dozens of archeological sites as well.

The study was published in the latest issue of the US journal Proceedings of the National Academy of the Sciences (PNAS- see link below)

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Archaeology professor Dana Lepofsky of Simon Fraser University © Nicole Smith

Herring exist with slight variations, in seas around the world. It’s a small silvery fish roughly 25-35cm long having an oily flesh.

In recent years, the herring population along North America’s west coast has been decreasing and going through rather substantial fluctuations from year to year.

The researchers found that this was not always the case, and that for thousands of years the populations were much more abundant and more widespread.

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Pacific herring, about 25-35cm long © Islandwood.org-Wiki

They hint that the important food source for humans and for the marine ecosystem started its decline just as an industrial-scale fishery began  a little over 100 years ago.

Professor Lepofsky points out that fishing practices have also changed in recent years to target the pregnant females for eggs which are shipped to the Asian market.

example of herring bones with a couple of salmon bones found during an archaeological dig on the west coast. Similar amounts of bones ranging from a few hundred to a few thousand years old were found at sites all along the British Columbia and Alaskan coasts (photo courtesy D Lepfsky)

Example of herring bones with a couple of larger salmon bones found during an archaeological dig on the west coast. Similar amounts of bones ranging from a few hundred to a few thousand years old were found at sites all along the British Columbia and Alaskan coasts (photo courtesy D Lepfsky)

This is more detrimental to the species recovery, which is also being affected by changes in the environment as the ocean warms up, the number and types herring predators is altered in the herring’s environment as is the herring’s own food sources.

The researchers study points out that the current state of herring populations  and their fluctuations are not what should be considered as the norm, but that human activities have greatly modified and reduced what should be the norm, and continue to do so.

Photo from 1950's- basket of herring is lifted from the full seine net. Each basket-load weighs about two tons. Commercial fishing has had a major effect on herring numbers. (Photo- Fisheries and Oceans Canada)

Photo from 1950’s- basket of herring is lifted from the full seine net. Each basket-load weighs about two tons. Commercial fishing has had a major effect on herring numbers. (Photo- Fisheries and Oceans Canada)

Professor Lepofsky and the other authors say the study should be seen as a valuable scientific tool to guide management policies going forward for what is an important species in the environment, and in the culture, and economy of the west coast.

PNAS study abstract and pdf link to full report

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Posted in Economy, Environment, International, Internet, Science and Technology

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2 comments on “Study links herring decline to commercial fishing
  1. Peter Ashcroft says:

    The state of change is here to stay. Just another aspect of the world’s evolution