alexa Errors Associated with a Systematic Sampling Creel Census
Agri and Aquaculture

Agri and Aquaculture

Fisheries and Aquaculture Journal

Author(s): Merle W Johnson

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An analysis of errors associated with creel census estimates obtained by systematic sampling is presented. The sample census method makes use of instantaneous boat counts at regular intervals, and provides a sample of about 24 percent of the fishing hours. To evaluate the census method, samples representing two census patterns were extracted from complete creel census data from Many Point Lake, a 1,716-acre walleye lake. Sampling errors at the 95-percent level for a 142-day summer census were about ± 13 percent for estimated man-hours; ± 17 percent for estimated man-trips; ± 17 percent for numbers of fish by species; and ± 19 percent for pounds of fish by species. Methods for calculating creel census error are presented and discussed. The largest component of error was associated with estimates of boat-hours. Catch per boat-trip also showed considerable error. Computation of estimates and error was greatly facilitated by calculating from a season-long sample rather than by using summary calculations for shorter intervals. An even distribution of census days throughout the week appears preferable to separate consideration of weekdays and week-end days with greater census effort on the latter.

This article was published in Transactions of the American Fisheries Society and referenced in Fisheries and Aquaculture Journal

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