tubular trap

tubular trap
1) a funnel-shaped trap in the form of a long, narrowing tube. Beyond a certain point, any fish in the funnel is unable to turn around or back up because of the narrow space and the fish\'s own spiny fin rays. Some of these traps may have thorns lining the inner surface, preventing fish from escaping
2) a funnel-shaped trap set vertically below a natural or artificial waterfall so that the flow of water carries the fish into the trap

Dictionary of ichthyology. 2009.

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