A fish ladder, or fishway, is a stucture that allows the fish to migrate upstream over or through a barrier. Barriers such as dams can fragment the fish population and cause major issues in river’s ecosystem. There are five basic fish ladder designs used throughout the world. These include: 1. the pool-weir, 2. the vertical slot, 3. the Denil, 4. the steeppass, and 5. naturaly baypasses or fishways.
Multiple factors need to be considered with constructing a fish ladder. These include: 1. the species of fish that will use the fish ladder, 2. the type of barrier, 3. water flow, 4. energy dissapation, 5. entrance locations, the list goes on an on. No single fish ladder will accommodate all species of fish.
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