need anglers input

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Hi every one at this time i am in the middle organizing a winter brown and rainbow trout derby with the St.Catharines game and fish club and we would like anglers input on how long the derby should be run for please post with your ideas also please note that this is a separate derby from the one day shore trout derbys in port dalhousie and will be open to boat and shore anglers alike any where in lake Ontario and its tributaries where these trout are in season

Thank you for your help