ArcGIS Blog

Connect Streams to Salmon Migration

Atlantic SalmonAtlantic salmon (Salmo salar) populations are in decline. Although there are many contributing factors, one of the most important is habitat connectivity. Dams and other man-made structures can block the migration of Atlantic salmon from the ocean to preferred spawning habitat. New dams are built with fishways—artificial waterways that fish use to access areas that are otherwise unreachable. However, many older dams are not outfitted with fishways, rendering huge stretches of suitable spawning habitat inaccessible to migratory fish. Fortunately, fishways can be retrofitted to existing dams to restore habitat connectivity.

In the new Connect Streams to Salmon Migration lesson on the Learn ArcGIS website, you’ll evaluate dams in the Mersey River of Nova Scotia, Canada, to determine the location best suited for the construction of a new fishway. After deciding on a dam, you’ll estimate the total amount of salmon breeding habitat made available by the fishway construction.

Written by Ian Manning, Esri intern, ArcGIS Learn team.

About the author

John Berry

Tweeting for LearnArcGIS is ssssoooo much fun! I'm John Berry, a recovering newspaper reporter and current product engineer for Learn ArcGIS. My main task is authoring and editing lessons for Learn ArcGIS, but while nobody is looking, I also get to write blogs and tweets for the site. (And since becoming a dad in 2004, I've long mastered the fine art of dad humor, which -- properly timed -- can cause eyes to roll and laughs to start.

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