An Unbiased Sampling and Estimation Procedure for Creel Censuses of Fishermen

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Abstract
For the purpose of estimating the total catch for a fishing season, the fishery may be divided geographically into area segments of approximately equal fishing pressure and a random sample of n segments then censused on randomly selected days during each week of the season. On any sample day, this complete enumeration on sample segments by the n enumerators is supplemented by counts of the number of fishermen present in the entire fishery, made by another enumerator who traverses the fishery at randomly chosen times during the day. This count may then be used to adjust the information obtained by the segment enumerators to obtain an unbiased ratio estimate of the total catch. The unbiased property also permits the estimation of sampling variance.

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