{"id":30677,"date":"2026-08-03T13:55:28","date_gmt":"2026-08-03T17:55:28","guid":{"rendered":"https:\/\/www.ecoportal.net\/en\/?p=30677"},"modified":"2026-08-17T05:58:57","modified_gmt":"2026-08-17T09:58:57","slug":"oregon-dam-50-lampreys-guide-fish","status":"publish","type":"post","link":"https:\/\/www.ecoportal.net\/en\/oregon-dam-50-lampreys-guide-fish\/30677\/","title":{"rendered":"An Oregon hydroelectric dam released 50 terrifying-looking fish to \u201cscent\u201d the water and convince another migrating species that the route was safe"},"content":{"rendered":"

Engineers have been seeking new methods to assist the native species migrating<\/strong> upstream past this point for several years.<\/p>\n

Recently, researchers tested an unconventional method using only fifty frightening-looking fish. They hoped the animals would leave behind a chemical trail as they moved downstream. The goal was not to increase their numbers.<\/p>\n

Instead, other migrating fish were meant to detect the scent they left behind<\/strong>.<\/p>\n

That trail eventually became part of efforts to recover an endangered native fish species.<\/p>\n

Not every fish could make the journey<\/h2>\n

Bonneville Dam is located at the confluence of the Columbia River in both Oregon and Washington. The dam creates hydroelectric energy and controls flow<\/strong> within the river.<\/p>\n

Although the dam provides fish passage systems, not all species utilize the fish passage systems equally. Salmon often use fish ladders effectively when migrating.<\/p>\n

However, other native fish species are challenged much more than salmon when utilizing the fish passage systems<\/strong>.<\/p>\n

Over the last few decades, scientists have studied how various species react to such obstacles.<\/p>\n

Therefore, finding alternative means of improving fish passage has evolved into a major conservation concern<\/strong>.<\/p>\n

A different way to guide migrating fish<\/h2>\n

Researchers determined that some species also rely on natural chemical signals left by other animals. These scents help migrating animals identify routes used before.<\/p>\n

The team hypothesized that these same scents could possibly encourage reluctant fish to proceed upstream. To test this theory, researchers designed an experiment to determine whether a small number of fish could motivate others to move upstream<\/strong>.<\/p>\n

The approach relied on behavior rather than new engineering projects.<\/p>\n

Efforts to improve migration routes for Pacific Lampreys continue across Oregon, according to Oregon Public Broadcasting<\/a>.<\/p>\n

Similar restoration efforts are underway elsewhere, including projects supported by the South Santiam Watershed Council<\/a> to improve habitat for lamprey populations.<\/p>\n

The fish behind the experiment<\/h2>\n

The experiment began with researchers releasing 50 Pacific Lampreys into<\/strong> the water. Pacific Lampreys have existed for millions of years.<\/p>\n

Their bodies feature circular mouth openings lined with multiple rows of teeth. Many people who are not familiar with Pacific Lampreys find their appearance surprising.<\/p>\n

Yet, despite their unfamiliarity, Pacific Lampreys are native to the Columbia River Basin<\/strong>.<\/p>\n

Millions of years ago, Pacific Lampreys inhabited the Pacific Northwest region of North America.<\/p>\n

To date, Pacific Lampreys are still considered culturally relevant by many Tribal Nations<\/strong> residing along the Columbia Basin.<\/p>\n

The work didn’t stop at the dam<\/h3>\n

Researchers believed the released Pacific Lampreys could help encourage future lamprey migrations through the area. The study took place adjacent to Bonneville Dam during peak migration time.<\/p>\n

Unfortunately, Pacific Lamprey populations have declined across the basin. Dams have blocked river systems and altered habitat along the way. Improving passage for species such as Pacific Lamprey<\/a> has become a conservation goal across Oregon.<\/p>\n

Beyond Bonneville Dam, restoration efforts are taking shape in streams where lampreys once roamed freely. Conservation groups are working with local partners to reconnect habitats that support lamprey populations. Habitat improvement projects have included removing migration barriers. They have also returned lampreys to waters where they disappeared<\/a> decades ago.<\/p>\n

One example is work currently being conducted in the South Santiam watershed<\/strong>.<\/p>\n

Collaboration between organizations has helped create habitat for future lamprey populations.<\/p>\n

The scent experiment illustrated a different approach to conservation. Not every solution requires large-scale infrastructure or changes<\/strong> to river systems. Sometimes understanding how animals communicate chemically produces entirely new conservation solutions.<\/p>\n

Instead of relying only on engineering solutions, researchers are finding that one species’ behavior may help restore another.<\/p>\n

As scientists refine these approaches, species that have survived for millions of years may benefit from understanding their own behavior<\/strong>.<\/p>\n

Similar questions about how fish find their way home have also emerged elsewhere in Oregon.<\/p>\n

Returning steelhead once completed a journey<\/a> of hundreds of miles back to the river where they began.<\/p>\n","protected":false},"excerpt":{"rendered":"

Engineers have been seeking new methods to assist the native species migrating upstream past this point for several years. Recently, researchers tested an unconventional method using only fifty frightening-looking fish. They hoped the animals would leave behind a chemical trail as they moved downstream. The goal was not to increase their numbers. Instead, other migrating … Read more<\/a><\/p>\n","protected":false},"author":27,"featured_media":30699,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"rank_math_focus_keyword":"fish,migration","rank_math_title":"","rank_math_description":"An Oregon dam used 50 Pacific Lampreys to guide migrating fish through the river system using scent trails during a migration experiment in Oregon waters.","footnotes":""},"categories":[8],"tags":[],"class_list":["post-30677","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-energy"],"_links":{"self":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/posts\/30677","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/users\/27"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/comments?post=30677"}],"version-history":[{"count":0,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/posts\/30677\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/media\/30699"}],"wp:attachment":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/media?parent=30677"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/categories?post=30677"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/tags?post=30677"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}