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Pitlochry fish ladder was created in 1951.
You can build a fish ladder.
fish ladders help fishso they don't get sick
A fish ladder is a structure which allows fish to move past an obstacle such as a dam. Without fish ladders, fish would be stuck downstream of the obstacle, and this could potentially have a negative impact on the breeding cycles and lifestyle of the fish. So, It protects the fish in the environment, and helps animals that eat fish.
The answer is a fish ladder.