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abundance albacore anchoveta anchovy artisanal Atlantic Baltic bigeye tuna billfish biological biomass Black Sea by-catch capelin catch rates cetaceans chub mackerel coastal commercial countries decline decreased demersal demersal fish demersal stocks depleted eastern environmental fish stocks fisheries management fishing effort fishing mortality fishing pressure fluctuations foreign fleets fully exploited Gulf Gulf of Lions hake harvest heavily exploited heavy fishing increased Indian Ocean inshore lobster major management measures marine Mediterranean moderately exploited Nino North Sea northern nutrient offshore orange roughy over-exploitation overall overfishing Pacific pelagic fish pelagic stocks Peruvian anchoveta populations potential quota recent recruitment region reported runoff salmon sardine Sardinella shrimp skipjack small pelagic South southern bluefin tuna spawning stock biomass squid sT TT stock assessment swordfish TACs Total catches trawl fishery trends TT TT TT western whales year-classes yellowfin yellowfin tuna