the allocation of stations to strata might be a compromise allocation based on data from previous years. Thus, for yellowtail and winter flounder, stations would be allocated in the northern strata (1– 17) and for summer flounder, stations would be allocated in the south (61– 75). Although the optimal or compromise allocation calculations may result in no tows being allocated to some of the strata, it would be prudent to include at least two tows in each of these strata (even where “1” is indicated) in case the spatial distribution of the different species change. This will probably result in a loss of efficiency but this loss is unlikely to be large. If spatial patterns are not very persistent, an adaptive allocation scheme (Thompson and Seber, 1996) might be beneficial, again using some combination of catches of the flounder species in the current survey to allocate additional stations to the more variable strata.

The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement