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Figure 7. Bering Sea summer euphausiid backscatter at 120 kHz and walleye pollock backscatter at 38 kHz from the EIT 2004-09 surveys. Age 3+ walleye pollock biomass estimated by the stock assessment model (SAFE Table 1.22, December 2009). Each time series has been normalized to its value in 2004. The 2009 results are preliminary. |