Crab Gauge for Western Australia
thingiverse
This gauge verifies that you're catching Blue Swimmer Crabs of the right size. Currently set for 127mm, which is accurate as of my last update. Double-check that your printed gauge matches the specs on this website: http://rules.fish.wa.gov.au/Species/Index/27. I recommend attaching the gauge to your scoop net with some flexible wire, allowing you to easily measure crabs while they're in the metal scoop - it's a simple yet effective approach.
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