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algae ammonia analysis annual Atlantic Atlantic salmon average Biol biological biomass Board British Columbia brook trout cadmium Canada carbon catch cell chlorophyll chum salmon coastal concentrations costs cutthroat trout Daphnia density depth distribution economic effects efficiency effluent environment estimates estuary exposure factors fibrils fish fisheries management fishermen fishing effort fleet freshwater gear gillnets golden shiner growth harpacticoid harvest increase inputs juvenile Lake levels license limited entry liver lobster marine maximum mean measured ment method mg/L mortality Nanaimo observed Oceans organic oxygen ozone Pacific particles phosphorus phytoplankton plankton population predation prey production protein quota rainbow trout rationalization regulation resource rent River salmon samples scallops season sediment shiner spawning species stations Strait of Georgia surface Table temperature tion tissue toxicity uniremis values vessels virus weight whales yield zone