FISHFRY BULLETIN: VOL. 72. NO. 2 



PACIFIC 5ARDI^E SCALE DEP- RATE (S- B- ) 

 V5- BIDMA55 2 YRS- AND OLDER (1930-1959) 



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MILLION METRIC TONS 



BILLIONS 



Figure 7a, b. — Scatterplot of the 5-yr averages of the Pacific sardine biomass (after Murphy, 1966) and the scale-deposition rate in 

 Santa Barbara sediment, 1930 to 1959. The plot of biomass versus scale deposition though indicating a significant relationship 

 (Spearman rank-correlation coefficient is 0.81, n = 6) shows considerable scatter. If, on the other hand, the year-class size at 2 yr of age 

 is plotted against the scale-deposition rate in the year spawned, the scatter is markedly reduced and a highly significant relationship 

 emerges (Spearman rank-correlation coefficient is 0.99, n= 6). The reduction in scatter can be explained through the observation that 

 most of the scales encountered in the sediment were derived from younger fish. 



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MILLION METRIC TONS 



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MILLION METRIC TONS 



Figure 7c,d. — Scatterplot of the 5-yr averages of the northern anchovy spawning population estimates (after Smith, 1972) and the 

 scale-deposition rates in Santa Barbara and Soledad Basin sediment, 1950 to 1965. The scale-deposition rates in both the basins vary 

 airectly with increasing population estimates of the northern anchovy. The relatively steep slope of the southern subpopulation (S) 

 relative to the central subpopulation (CNT) reflects the smaller southern population. 



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