fish ladder
Definition
Noun: A fish ladder is a structure built on or around a dam or other river obstruction. It consists of a series of ascending pools or steps that allow fish, particularly migratory species like salmon, to swim upstream to their spawning grounds.
Usage
A fish ladder is a man-made solution to a man-made problem (dams blocking natural waterways). It enables the natural migration of fish, which is crucial for their life cycle and for maintaining healthy ecosystems and fisheries. - The new dam included a fish ladder to help salmon reach their traditional breeding areas. - Biologists monitor the fish ladder to count how many species are using it to pass the barrier.
Advanced Usage
- Ecological engineering: A fish ladder is an example of ecological engineering, where technology is used to mitigate human impact on the environment.
- Fish passage: The term "fish ladder" is a specific type of fish passage facility. Other types include fish lifts and bypass channels.
Variants and Related Words
- Fishway: A more general term synonymous with fish ladder.
- Fish pass: Another general term for a structure that allows fish to move past a barrier.
- Pool-and-weir ladder: A common technical design for a fish ladder, describing its structure of pools separated by small overflow dams (weirs).
Synonyms
- Fishway
- Fish pass
- Salmon ladder (when specifically designed for salmon)
Related Concepts
- Anadromous fish: Fish, like salmon, that migrate from the sea to freshwater rivers to spawn. Fish ladders are primarily built for these species.
- Upstream migration: The journey fish make to their spawning grounds, for which fish ladders are constructed.
- Barrier mitigation: The broader category of actions taken to reduce the impact of human-made barriers on wildlife movement.
Noun
-
a series of ascending pools providing a passage for salmon to swim upstream past a dam
