U.S. Fish & Wildlife Service
Sacramento Fish & Wildlife Office
Comprehensive Assessment & Monitoring Program
(CAMP)
Glossary
Screw Trap:
An in-river fish sampling tool for sampling juvenile salmonids that are swimming downstream. Also called a rotary screw trap.
The trap consist of a six to eight foot funnel suspended between two pontoons. As water enters the funnel, the internal screw core rotates. Fish are trapped in pockets of water that are forced into a box at the rear of the trap.
Rotary Screw Traps
Harry Mossman
Fish & Wildlife Service
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