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English Summarythe North PacificWalleye PollockDemersal FishAcoustic EstimationEcho IntegrationCoastal WatersClupea PallasiiKuroshio ExtensionVery Fine SandSteelhead TroutNorth Pacific OceanAcoustic ScatteringFishing VesselsSuspended MatterDominant GroupShell GrowthPrimary ProductionSexual MaturityChum Salmon