. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 1 775 DIAMETER OF EGG (mm) Figure 59-7. Frequency distribution of egg diameter of walleye pollock by area and by phase. was statistically significant between the two phases except in the southwest area (Table 59-8). Comparison of the mean egg diameter of a pair of developmental stages assumed to be laid by the same spawning population was attempted over the two phases. As seen in Table 59-9, there was no statis- tically significant difference in the means i
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 1 775 DIAMETER OF EGG (mm) Figure 59-7. Frequency distribution of egg diameter of walleye pollock by area and by phase. was statistically significant between the two phases except in the southwest area (Table 59-8). Comparison of the mean egg diameter of a pair of developmental stages assumed to be laid by the same spawning population was attempted over the two phases. As seen in Table 59-9, there was no statis- tically significant difference in the means in most TABLE 59-5 Comparison of the difference of mean egg diameter between all pairs of mean egg diameters in Phase 1 and Phase 2. A value of Z is given when a statistically significant difference occurs in a comparison at the 5-percent (*), 1- percent (**), and (***) levels; NS denotes no significant difference indicated in a comparison. Areas Phase 1 Phase 2 Southeast-North Southeast-Northwest North-Northwest NS * NS * cases. Exceptions were the pairs between Stage-Ill eggs in Phase 1 and eggs of Stages IV and VI in Phase 2. However, since most Stage-Ill eggs were considered to have advanced to Stage V in Phase 2, it will be safe to conclude that there was no significant difference in egg size when Stage III eggs in Phase 1 advanced to Stage V in Phase 2. Table 59-10 presents the results of comparing the means of the two de- velopmental stages which are assumed to have orig- inated from different spawning populations. It is apparent that each combination of a pair shows a TABLE 59-6 Comparison of the difference of mean egg diameters of the two areas between Phase 1 and Phase 2. A value of Z is given when a statistically significant difference occurs in a comparison at the 5-percent (*), 1-percent (**), and (***) levels; NS denotes no significant difference indicated in a comparison. Area Southeast North *** * TABLE 59-7 Mean egg diamet
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