A facility constructed near weirs and barrages to assist fish migration upstream or downstream is called __________________?
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Answer: A. Fish ladder
Explanation
A fish ladder provides a stepped passage allowing aquatic wildlife to bypass artificial obstructions safely. Connected pools and baffles break high water drops into manageable increments for migrating fish species. This engineered structure ensures ecological continuity by reconnecting fragmented riverine migration routes. Dams and barrages built for water storage create impassable vertical barriers for migratory river species. Fisheries biologists design fish ladders tailored to the swimming capabilities of target species like salmon and shad. Flow control gates regulate water levels inside each ascending pool to maintain appropriate velocities.
Environmental impact assessments require dam operators to install fish passage facilities to protect aquatic biodiversity. Watershed restoration projects worldwide rely on fish ladders to revive depleted migratory fish populations. Monitoring stations are frequently integrated into fish ladders to track spawning migration success rates. Fish escape is an incorrect terminology that does not describe a structured upstream migration channel. Fish pool refers to an isolated basin rather than the multi-step ladder system designed for migration. Fish pond describes a still water aquaculture production facility rather than a river barrier bypass structure.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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