Fish Ladder

Secure food, build fish ladders.

Actions on the return of migratory fish and the fight against Corona have shown the true nature of the political system.

Finland’s largest river, and at the same time the fundamental rights of the people, have been waiting for a political solution for 70 years. But when Corona arrived, politicians were racing to come up with ways to restrict what people were doing. In addition, they are in a hurry to find ways to save some and destroy the life work of some others. So, it seems that at least a small dictator lives inside every politician.

This is just one kind of thing where people have to take power into their own hands. Collect money to build fish stairs if water power companies really can’t afford it.
In addition, we need a lot of new ideas and solutions that could work. Here is mine:

Fish and their success in the wild will be increasingly important in the future given the world’s food needs. Fish is also more climate-friendly than meat production.

Unfortunately, energy production around the world has closed rivers. This has prevented migratory fish from entering natural breeding areas.

And expert information in between:
Yle’s article / 2019/06/28 / salmon-is-perfectly-adapted-to-its-birth-river-found-salmon stock-takes

“The salmon genome has adapted to a particular river for thousands of years.
Because salmon breeds in the same river where they were born, the chick has by heredity adapted to the environment of this particular river. Therefore, efforts are being made to keep the original salmon strain in various rivers alive, even though the migration link to the river has been severed. The lost salmon strain of the river takes thousands of years of development.
Salmons are migratory fish. They spend their juvenile years in the river, usually two to four years. After that, they navigate to the sea to grow until it is time to return to the river of birth to spawn. ”

The headwaters of the Kemijoki river, which flows in northern Finland, are exceptionally clear. Summer light is 20-24 hours a day. Under those conditions, salmon chicks begin to grow in two to four years. Because knowledge is also genetically inherited, when they ascend the river, they retrieve those ”childhood” conditions that are at the same time propitious to reproduction. That is, they head toward clear waters, shallow flows, but especially toward light. Light is also used in night fishing to attract fish towards the fisher.

According to the monitoring data of the Natural Resources Center, the rise of salmon in the Simo and Tornionjoki rivers seems to be at its most intense from about mid-June to mid-July. That is, just at a time when there is the most light. So light has something to do with fish behavior.

Lighting, especially in cloudy and / or rainy weather, would certainly be useful. In addition, the water downstream of the Kemijoki river is not as transparent as at the tops, so the lighting would also to attract fish that are swimming deep, up to the mouth of the fish stairs.

For these reasons, I decided to use the fact that the fish ladders coloring should be light colored, and its front end, the ascent from down to up and the top end is lighted. Was it day or night! Perhaps then, even to a down way swimming fish would be able find the safely route shown by the light to come down along fish stairs towards the sea?

In addition, many Kemijoki power plants have log gutters left, which can be easily converted into fish ladders. So the investment would not be very expensive. The gutters also have outwardly sloping edges that also let in natural light well.

There is also an even more important detail to make the fish notice the existence of a small flow of fish stairs from the massive flow of the power plant. But about that later.

Reijo Lahdenperä

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An affordable solution for power plants without log gutters.

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