NEW RESEARCH / TRAPS & ENTRANCES
New crab-trap
research.
Dated briefs on new research into crab traps, entrances and catch. Dungeness studies come first. Findings from other crab species are labeled, and each item says what kind of evidence it is and where it stops.
BRIEF ·
Research from October 2–9, 2026
One new review this week. No new Dungeness study of trap entrances or catch efficiency turned up.
Better ways to judge a trap entrance
A review of 173 studies on crab harvesting technology recommends tracking each step at the entrance (crabs approaching, trying to get in, getting in, and leaving) instead of counting only the final catch. That separates an entrance that draws crabs in from one that keeps legal crab inside. The authors also call for comparing entrance angle, passage length and opening direction within the same pot type.
Evidence: published review. These are recommendations for future trials, not new catch results, and no Dungeness-specific findings are reported.
Zhang, Chen and Tang, Frontiers in Marine Science (opens in a new tab)Escape gaps and soak time in snow crab pots
A Barents Sea study compared snow crab pots fitted with several escape gaps against standard mesh-only pots. Pots with gaps caught fewer undersize crab and still held the largest crab. Larger gaps sorted sizes more sharply, especially on four-day soaks, but also let some smaller legal crab out.
Evidence: field study on Chionoecetes opilio, not Dungeness. Summarized from the published abstract.
Cerbule et al., Journal for Nature Conservation (opens in a new tab)Try it on your own gear
To compare two entrance setups, use pots that are otherwise the same, alternate them along the string, and keep bait and soak time equal. Count legal crab and shorts in each pot on every pull. Over enough pulls, that shows whether a change holds more legal crab without making entry harder. A camera on the entrance adds how many crabs try to get in and how many leave.