In linear flow-through fish raceways (used for rainbow trout and channel catfish), the floor is constructed with an intentional longitudinal bottom slope of $1\% - 2\%$ ($1-2\text{ m}$ fall per $100\text{ m}$ length).
This gradient generates a self-cleaning hydraulic flow velocity that transports settled solid feces toward the downstream waste collector without requiring mechanical scraping.
Correct Option: Option 2 (1-2%).
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