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Abundance Assessment Bycatch Cetaceans Common dolphin Environmental drivers Iberia Marine mammals North East Atlantic Sardine South West Atlantic cephalopods discards ecology fish hakes maps sperm whale 1100 (721–1662) tons of hake (Merluccius merluccius) and 1900 (1222–2752) tons of scads (Trachurus sp.) annually. For striped dolphins (Stenella coeruleoalba) 200 (11–504) tons of hake and 1600 (0–5318) tons of scads. Estimated amounts taken by harbour porpoises (Phocoena phocoena) and bottlenose dolphins (Tursiops truncatus) are much lower 4871–9476) tons of sardine (Sardina pilchardus) 6200 (3448–11,129) tons of gadids 8800 (6195–12,647) tons of gadids Bay of Biscay Biogeochemical tracers Boreoatlantic armhook squid By-catch Celtic Sea Cetology Construction of ecosystem models requires detailed information on trophic interactions which may not be readily available