OK Dundee, here is what you tell PT to do. Cut down a big bushy piece of Manuka (as big as he can handle by himself). Cut up one of his plucked possums into thumb sized pieces and tie the pieces into the Manuka deep inside the bushy bits. Submerge the Manuka into your river at an easily accessible deep slow part one evening. The next day he should take the Manuka out of the river and put it onto a bank so that he can harvest all of the Koura and put them into a big bucket (he will need a big bucket as there will be shitloads of them).
Let me know how he gets on.
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