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Fish ladders in action

December 23, 2016 0
Over in America the fish spawning season is underway, which means that the numerous fish ladders that sit along many of the great American waterways are seeing lots of action.  The Nimbus fish ladder, on the American River in California is especially busy at this time of year, as Chinook salmon return to their spawning grounds.  There are eight hatcheries in the area, all of which make use of the fish ladder to catch salmon and harvest eggs; approximately 24 million of them over the season, to breed young salmon for release in the spring of 2017.  It is open to the public and has plenty of educational resources, so everyone can enjoy the spectacle of the returning fish jumping upstream through the ladder and learn about the conservation efforts of the hatcheries.  Viewing windows allow...
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Fish Ladder Round Up!

February 23, 2015 0
The Nequasset dam in Woolwich, Maine, is the location of a very important fish ladder project which aims to protect the future of alewives, and has been doing so for 300 years.  The town of Woolwich has stipulated for centuries that any dam built there must also provide a means for returning fish to get to the spawning ground upstream.  The dam was rebuilt in the 1950s and the fish ladder that formed part of it was badly in need of repair.  Bath Water District, who own the land and dam, worked with the local Fish Commission, as well as local and national authorities and fish harvesters on the restoration project.  The fish harvesters rely on the ladder for the fish to return to the lake, where they are harvested and reared for lobster bait, which is a good commodity in a state renowned for...
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Fish Ladder Inspires Game of Pooh-Sticks

February 20, 2015 0
At Damariscotta Mills in Maine, USA, residents are celebrating the nearly completed restoration of the fish ladder built to help alewives return to their spawning grounds.  It is Maine's oldest fish ladder, having been originally constructed in 1807 and it functioned for two centuries before the project to restore it began in 2007. This year, over 1 million alewives were counted entering Damariscotta Lake and this achievement is the focus of the Fish Ladder Restoration Celebration.  There are still a few tasks to finish, which include pouring concrete to support some of the sections, finishing the concrete with a stone veneer and modifying the lowest section of the weir to still function properly at low tides. The event includes the Running of the Alewives, where visitors buy a wooden fis...
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Ladders for Herrings

February 17, 2015 0
Herrings have been the subject of many fish ladder and waterway improvements: recently we looked at the replacement of the fish ladder at the Nequasset Dam in Maine and the proposed improvements to the waterways around Rochester, Massachusetts in our last tour of the fish ladder world. The town of Scituate, also in Massachusetts, is to see an improvement in the local herring population shortly, as the renovation of the fish ladder and raising of the water level in the reservoir above has been approved by the Federal Government as part of an environmental bill. The good news for the residents of Scituate and the surrounding areas is that because the work is government mandated, they may qualify for a grant to cover all, or part of the cost of the project, so it will not impact too much on t...
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Fish Ladders News Roundup!

February 11, 2015 0
There has been a lot going on in the world of fish ladders lately and it's all good news for herrings (and people who like to eat them!).  The alewife species of herring is native to North America, but as with all types of fish, man-made obstacles in the rivers have seen the population decline in the last fifty or so years. Even when there are fish ladders in place there can still be a decline in population, as the fish ladders can fall into disrepair and older types are not as efficient as newer designs. At the Nequasset Dam in Maine the fish ladder had been in place for nearly sixty years.  Built in 1955, the concrete structure was in need of repair after years of exposure to cold water and freezing conditions so Bath Water District, which owns the dam and fish ladder has teamed up with ...
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