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Research Methods for Salmon Abundance Estimation

Juvenile Trap Design: Gear Types
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Partial Capture Full Capture  

Considerations before selecting gear type:

Target species: adult escapement, juvenile life history, in river migration patterns

Drainage characteristics: river size, flow variability, debris loads

Study objectives: run timing, index of abundance, estimate abundance, hatchery evaluation, fresh water survival

Specific trap location: proximity to hatchery release sites, trap security and access, anchoring points, recreational river traffic