Some Like It Dark: Light Pollution And Salmon Survival

June 4, 2018

FISHBIO

The interaction between light pollution and predation could deal a heavy blow to species already struggling to survive. Bridges, in particular, often have lighting that shines into rivers at night, and attraction to these stationary lights can stop juvenile fish in their tracks as they migrate downstream, making them vulnerable to predators. Fish also frequently migrate and feed at night to hide from predators in the darkness, and bright lights shining on the water eliminate their protective cover. In rivers where salmon spawn, juvenile salmon can be especially impacted by bright nighttime lights or reflections on the surface of the water because predation is a major contributing factor to the high mortality of juvenile salmon. Light pollution from the iconic Sundial Bridge in Redding, California (shown above), was a suspected factor that contributed to the near loss of Sacramento River fall-run Chinook salmon from 2011–2013.

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Hard work, smart science contribute to salmon’s success on Cosumnes River

December 16, 2016

By Mike Eaton

The Sacramento Bee

The Cosumnes River, the natural jewel on Sacramento’s southern flank, is enjoying its best run of Chinook salmon in years. The count so far is impressive, upward of a thousand. Their journey from the ocean toward the mountains is measured by a device mounted above a fish ladder that counts and photographs fish as they follow their ancient genetic drive.

Mike Eaton [is a long-time member and supporter of ECOS and also] worked for The Nature Conservancy from 1995 through 2007. He now advises the Cosumnes Coalition, a watershed restoration partnership. Contact him at michaelreaton [at] fastmail [dot] com

Read more here: http://www.sacbee.com/opinion/california-forum/article121358088.html#storylink=cpy

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