. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . I ""^-,__^,^ y'V^fi^ ^Un/mok Pass ^^>^^ Figure 66-18. Distribution of Clinocardium ciliatum based on collections taken with a grab, pipe dredge, clam dredge, and otter trawl. annuli were assigned to the year which includes the entire growing season. For example, the last annulus on the specimens from the pipe-dredge collection was formed during the winter months of 1975-76, and the last length values were assigned to the growing year 1975 in the growth history figures. Mean
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . I ""^-,__^,^ y'V^fi^ ^Un/mok Pass ^^>^^ Figure 66-18. Distribution of Clinocardium ciliatum based on collections taken with a grab, pipe dredge, clam dredge, and otter trawl. annuli were assigned to the year which includes the entire growing season. For example, the last annulus on the specimens from the pipe-dredge collection was formed during the winter months of 1975-76, and the last length values were assigned to the growing year 1975 in the growth history figures. Mean shell length, range, standard deviation, and standard error of the mean were plotted to show the relationship between shell length and age for the six species of clams. The mean is denoted in the last- mentioned plot by the horizontal line, the range by the vertical line, the two standard deviations by the white box, and the two standard errors of the mean by the cross-hatched box. The standard deviations and the standard errors of the mean are not shown for age-classes with a sample size of 29 or fewer. Mortality rates for Nucula tenuis, Nuculana fossa, and Macoma calcarea were determined by the method of Gruffydd (1974), which assumes that although recruitment varies from year to year at specific stations, overall recruitment to a large area is constant for an unfished population. Thus, the total number of each species of clam was plotted against age. The calculated curves eliminate the effect of uneven
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