How do I separate out the marketable sizes from the undersize on the dam bank?
A quick method is to use a grader, which you can make. A grader has round, parallel bars, with the gap between the bars set at the carapace width corresponding to the selected Yabby weight, say 30 grams. Since the weight of yabbies for a given carapace width varies, a grader does not give precise (“knife-edge”) selection; some of the yabbies retained will be just under 30 grams and some that fall through will be just over 30 grams. If yabbies lose legs or are dehydrated they’ll weigh less, too.
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